ISTerre - Institut des Sciences de la Terre

Laboratory data available !

Philippe ROUX — 2014-10-18T11:26:19Z

The purpose of this web page is to make acoustic or seismo-acoustic data recorded at the laboratory scale available to the public. The following data sets are unique in the sense that they would be very difficult to acquire with numerical modeling. This is the main purpose of analog experiments at the lab scale.

What makes these data set unique is the fact that they describe the acoustic response of a mechanical system that is evolving in time, thus generating a lot of complexity. For example, think of an acoustic waveguide where two vertical arrays of transducers face each other and record the broadband multipaths waveguide response between each source and each receiver. Now, create surface gravity waves at the air-water interface while you continue to emit and record the impulse response matrix at a rate that is much faster than the characteristic time of the gravity wave. This data set takes a few minutes to be generated at the lab scale. It would take forever, if possible, to create the equivalent data set with numerical simulations.

Each data set proposed below may be quite large. Be aware that the download could last a certain amount of time. The data come in Matlab format with one or a few codes to read / plot the data. There is also a Readme file and some pictures that explains very shortly the acquisition set-up and, sometimes, one scientific paper that was published from this data set.

The idea is to promote collaborative research. Of course, you can download the data and process them the way you want. Whatever the data utilization, for research or for teaching purposes, the only requirement is an acknowledgement to :

Philippe Roux, ISTerre, Université Joseph Fourier, CNRS UMR 5275, Grenoble (France).

Of course, I would be more than happy to describe the data in more details and, why not, participate one way or another to your research investigation. So feel free to interact with me as much as possible….

- Multiply-scattered flexural plate waves interacting with a local and periodic stress load

Picture of the experimental set-up built from a thin duraluminium plate in which 500 holes were drilled to induce multiple scattering and randomness for flexural plate waves propagating in the kHz frequency. Both a piezoelectric pulsed source and 16 mini-accelerometers are attached to the plate. Aligned with the array, a mini-vibrometer (not shown here) applies a load locally (10 N to 45 N) that can be either transient or periodic. The plate deformation is separately monitored with two synchronised cameras and a stereo-correlation algorithm.

Data available here

- Acoustic transfer matrix in a waveguide interacting with dynamic surface gravity waves

Schematic diagram of the experimental set-up. Vertical 64-element source and receiver arrays face each other in a 1-m-long, 55-mm-deep water waveguide. The waveguide dimensions are large compared to the 1.5 mm wavelength of the ultrasonic wave. The bottom is made of steel, which allows for perfect reflection at this interface. The waveguide transfer matrix, composed of the 64 x 64 source-receiver responses, is fully recorded every 0.1 s. A computer-controlled dynamic shaker is attached to a Plexiglas cylinder placed at the air–water interface on the side of the waveguide. This device generates impulsive gravity waves that travel from the air–water interface and cross the source–receiver axis in a few seconds.

Data available here

- Acoustic transfer matrix in a waveguide interacting with dynamic thermal plume

Schematic diagram of the experimental set-up. Two coplanar, 64-element, source–receiver ultrasonic arrays centered at 1 MHz face each other in a 1-m-long, 55-mm-deep water waveguide that is delimited by two air–water and water–steel interfaces. At first, the sound speed is uniform in the waveguide. The sound-speed variations are generated by a thermal resistor that is embedded in the bottom of the ultrasonic waveguide (range, 225 mm). During the 40-s-long acoustic acquisition, the heating system is activated at acquisition time = T0 and stopped at time = T0+T (for example, T0=5 s and T=20 s). The waveguide transfer matrix, composed of the 64 x 64 source-receiver responses, is fully recorded every 0.1 s. In a separate experiment, a thermocouple was positioned variously above the resistor to measure the temperature of the thermal plume during the same heating process.

Data available here

- Ultrafast ultrasonic acquisition for dynamic flow measurement

New insights into the spatio-temporal structure of rough-wall turbulent boundary layers are expected from the development of novel acoustic high-resolution measurement techniques. In particular, the capability to perform two-dimensionnal and two-component (radial + transversal) flow velocity measurements based on Acoustic Particle Image Velocimetry is seen as a promising technology in a variety of fluid mechanics applications.

A first dataset was collected in a fully rough turbulent clear-water open-channel flow. This dataset could be used to test and optimize algorithms applied for acoustic image treatment, 2D image correlation for velocity estimations. The performance of the ultrasonic measurement should be evaluated in terms of turbulence and sediment transport measurements in the studied flow conditions. For example, the capacity to resolve the inertial range of the turbulence spectra, the mean turbulence scales, the fields of turbulence intensities, Reynolds shear stress and turbulent kinetic energy dissipation rate can be investigated.

Data available here

- Ultrasonic interaction with a vorticity filament before/after vortex burst

This project finds its roots in the two following points. First, acoustics is a tool of choice to study complex flows because it provides a real-time non-invasive signature of the vorticity field. Second, recent works in acoustics have overcome the difficulty to image and detect weak scattering objects. Since two decades, a large amount of work aimed to measure numerically and theoretically the acoustic scattering properties of a single vortex. However, a filamentary vortex is a very weak scatterer whose experimental acoustic signature is often hidden by the phase distortion effect caused by the vortex-induced fluid flow.

The project goal is to combine two newly-developed experimental procedures to (1) generate, control and monitor a single stable fluid vortex of adjustable size and strength, (2) measure the total acoustic cross section of a vorticity filament over a large frequency bandwidth from measurements performed in a highly reverberant acoustic cavity. The combination of these two techniques will result in a data base of scattering cross section of vortices.

The data bank generated will be an important step for (1) the first-ever experimental validation of the acoustic-quantum physics analogy that is classically used to model the scattering cross section of a vortex, (2) the careful study of the long-range interaction – short-scale scattering between an acoustic wave and a vorticity filament and its potential implications in detection/tracking of tornadoes in air acoustics.

Data available here

- Metamaterial physics observed at the mesoscopic scale

We demonstrate the experimental realization of a multi-resonant metamaterial for Lamb waves, i.e. elastic waves propagating in plates. The metamaterial effect comes from the resonances of long aluminum rods that are attached to an aluminum plate. Using time-dependent measurements, we experimentally prove that such a medium exhibits wide band gaps as well as sub- and supra-wavelength modes for both a periodic and a random arrangement of the resonators. The extraction of the metamaterial dispersion relation allows us to predict this physics through hybridizations between flexural and compressional resonances in the rods and slow and fast Lamb modes in the plate. We finally underline how the various degrees of freedom of such system paves the way to the design of metamaterials for the control of Lamb waves in unprecedented ways.

Data available here

Cérémonie de remise du prix scientifique de la fondation del Duca (Institut de France)

Philippe ROUX — 2014-02-14T09:47:03Z

Vendredi 14 février 14 h - Salle de Conférences ISTerre -
A l'invitation de Patrick Lévy, président de l'UJF, M. Philippe Taquet, Président de l'Académie des Sciences, et M. Vincent Courtillot, délégué de la section des Sciences de l'Univers, présenteront les actions de l'Institut de France et le prix scientifique de la fondation del Duca remis en 2013 à Michel Campillo. Par sa subvention, la fondation soutient un projet de chercheurs d'ISTerre qui sera présenté. La réunion sera close par (…)

- Agenda scientifique / À la une

Cérémonie de remise du prix scientifique de la fondation del Duca (Institut de France)

Philippe ROUX — 2014-02-14T09:47:03Z

- Scientific events / À la une

Curriculum Vitae

Philippe ROUX — 2013-07-05T11:23:00Z

Biographical Sketch

Philippe Roux

ISterre

University Grenoble Alpes, France

philippe.roux univ-grenoble-alpes.fr

A. EDUCATION

2001 - Professorial recognition (Habilitation), Paris University.
1998 - Postdoctoral Research, Scripps Institute of Oceanography, San Diego (USA).
1997 - PhD with Specialty in Liquid Physics, Paris University.
1994 - École Normale Supérieure (Paris), Specialty in Physics.

B. CURRENT POSITION(S)

since Jan. 2020 - Director of ISTerre, Grenoble (France).
2009 - Director of Research (DR1 since Jan. 2016), CNRS, ISTerre, Grenoble (France).

C. PREVIOUS POSITION(S)

2005 - Research Associate (CNRS), ISTerre Laboratory, Paris (France).
2004 - Research Associate (tenured position), Scripps Institute of Oceanography, San Diego (USA).
2002 - Visiting Scientist, Scripps Institute of Oceanography, San Diego (USA).
1999 - Research Associate (CNRS), Waves and Acoustics Laboratory, ESPCI, Paris (France).

D. FELLOWSHIPS AND AWARDS

2013 Medwin Prize in Acoustical Oceanography (Acoustical Society of America).
2012 Excellence in Refereeing for Journal of Geophysical Research - Solid Earth (JGR).
2010 -2014 Reward for Scientific Excellence, CNRS.
2009 Best Paper Award of the European Association of Geoscientists and Engineers (EAGE).
2005 Chair of Excellence Grant (ANR).
2004 Fellow of the Acoustical Society of America.

E. RESEARCH ACTIVITY

I am an experimental physicist with a solid background in the field of acousto-elastic wave propagation, both at the medical ultrasound scale (mm) and at the scale of underwater acoustics (km) or geophysics (100 km). My scientific career has been built through several geographical mutations which were as many thematic mutations.

During my thesis at the Laboratoire Ondes et Acoustique (under the supervision of Mathias Fink, 1994-1997), I worked with laboratory assistants on the concept of temporal reversal and its applications, on the one hand to the propagation in ultrasonic waveguides, and on the other hand to the interaction between an acoustic wave and a vorticity filament.

Afterwards, I pursued my young research career by two stays at the Scripps Institute of Oceanography (San Diego, California), from Sept. 1997 to Dec. 1998 as a post-doc and from Jan. 2002 to July 2005 during a secondment at the CNRS. During my first stay, I deepened my theoretical and numerical knowledge in underwater acoustics. Supervised by W.A. Kuperman, I was confronted for the first time to the analysis of oceanic data by participating to an experiment at sea. During the second stay, I created and developed the ultrasonic acoustics laboratory within the Scripps Inst. of Oceanography where I obtained a tenured position in Jan. 2004. My research was then oriented towards the spatio-temporal coherence of ambient noise in underwater acoustics and geophysics. Despite a great involvement in laboratory experiments, I spent more than three months at sea on three successive temporal reversal experiments in ocean waveguides (2003, 2004 and 2005) in collaboration with the NATO Undersea Saclant Center (La Spezia, Italy).

Between these two stays, freshly recruited at the CNRS (section 5 : Physics of condensed matter), I continued in Paris (LOA, now the Langevin Institute) my research on the coherence of the acoustic field with emphasis on wave propagation in strongly reverberant cavities (Jan. 1999-Dec. 2001). Funded by a young ACI researcher, I worked during this period on the concept of acoustic resonator by designing a "time reversal bazooka" capable of generating very high amplitude shock waves with a few transducers connected to low-power electronics.

Since July 2005, we moved back to France for good in Grenoble where I created the experimental acoustics team within the LGIT (now the Institute of Earth Sciences) thanks to an ANR Junior Chair of Excellence. Interactions remain strong with San Diego where I make one or two stays per year (one month in July 2013, for example). With Michel Campillo as a close collaborator, my research themes are naturally oriented towards seismology and geophysics. My work in geophysics is related to the use of ambient noise for imaging and monitoring of the earth's surface envelopes over propagation distances ranging from ten meters to a thousand kilometers. Geological objects such as fault zones, volcanoes or glaciers are part of my daily study objects. In 2018, we performed a high-resolution imaging expriment on the Argentiere Glacier in the French Alps , the RESOLVE project (https://resolve.osug.fr/), where we used a dense seismic network of 100 new-generation seismic instruments to monitor a glacier with unrivalled spatio-temporal resolution.

However, apart from geophysics, I remain fundamentally attached to experimental physics and to the physics of waves in complex media as shown by my latest work on meta-materials. For example, I recently coordinated (1) the ANR METAFORET project (2016-2021, https://metaforet.osug.fr/) which raises the question of the behaviour of a dense forest on surface waves, with trees playing the surprising role of coupled resonators for seismic waves and (2) the ECHOFISH project (2018-2023, https://echofish.osug.fr/) which aims to study the multiple scattering of ultrasonic waves by dense schools of fish.

To end this summary with a few highlights, I was named "Fellow" of the Acoustical Society of America in November 2004. I was promoted Director of Research at the CNRS in October 2009 and DR1 in 2016. I benefited from the Scientific Excellence Award from 2010 to 2013. I was awarded the Medwin Prize in Acoustical Oceanography by the Acoustical Society of America (ASA) in June 2013. Between 2012 and 2017, I managed the Waves team at ISTerre (50 people including 17 permanent researchers and 7 engineers/technicians). I was a member of commission 18 of the CNRS national committee (2016-2021) after having been a member of the CGRA1 commission of the Institute for Research and Development (IRD) from 2010 to 2014. Finally, I am the new director of ISTerre ( 300 people including 150 permanent staff) for the next five years starting since January 2020 ...

F. TOP 10 PUBLICATIONS ACCORDING TO ISI WEB OF SCIENCE (citation number)

1) M. Fink, D. Cassereau, A. Derode, C. Prada, P. Roux, M. Tanter, J-L. Thomas and F. Wu, Time-reversed acoustics, Reports on Progress in Physics, Vol. 63, N. 12, pp. 1933-1995, 2000 (512).

2) K. G. Sabra, P. Gerstoft, P. Roux, W.A. Kuperman and M. Fehler, Extracting time domain Green's function estimates from ambient seismic noise, Geophys. Res. Lett. 32, L03310, 2005 (429).

3) K.G. Sabra, P. Gerstoft, P. Roux, W.A. Kuperman and M. Fehler, Surface wave tomography from seismic ambient noise in Southern California, Geophys. Res. Lett., 32, L14311, 2005 (387).

4) P. Roux, K.G. Sabra, W.A. Kuperman and A. Roux, Ambient noise cross-correlation in free space : theoretical approach, J. Acoust. Soc. Am. 117(1), pp. 79-84, 2005 (332).

5) A. Derode, P. Roux and M. Fink, Robust acoustic time reversal with high–order multiple scattering, Phys. Rev. Lett, Vol.75, N.23, pp. 4206-4209, 1995 (322).

6) P. Roux and W.A. Kuperman, Extracting coherent wavefronts from acoustic ambient noise in the ocean, J. Acoust. Soc. Am., 116 (4), pp. 1995-2003, 2004 (252).

7) P. Roux, K. G. Sabra, P. Gerstoft and W.A. Kuperman, P-waves from cross-correlation of seismic ambient noise, Geophys. Res. Lett., 32, L19303, 2005 (238).

8) A. Colombi, D. Colquitt, P. Riux, S. Guenneau and R. V. Craster, A seismic metamaterial : the resonant metawedge, Scientific Reports 6, 27717, 2016 (225).

9) A. Colombi, P. Roux, S. Guenneau, P. Gueguen, and R. V. Craster, Forests as a natural seismic metamaterial : Rayleigh wave bandgaps induced by local resonances, Scientific Reports 6, 19238, 2016 (220).

10) C. Hadziioannou, E. Larose, O. Coutant, P. Roux, and M. Campillo, Stability of Monitoring Weak Changes in Multiply Scattering Media with Ambient Noise Correlation : Laboratory Experiments, J. Acoust. Soc. Am., 125(6), pp. 3688-3695, 2009 (187).

G. ORGANISATION OF SCIENTIFIC MEETINGS

May 2011, April 2013, May 2015 & June 2017 :
Co-Director of the series of workshops : “Passive Imaging and Monitoring in Wave Physics : from Seismology to Ultrasound”, one week, Cargese (Corsica), France (95 participants).

H. COMMISSIONS OF TRUST

– 2012-2015 : Member of National Recruiting Committee at Institute of Res. and Dev. (IRD, CGRA1).
– 2012-2017 : Leader of the team "Waves and Structures" at ISTerre (55 scientists, including 17 Faculty Staff and 7 Technicians/ Engineers).
– 2015-2018 : Board member of ITN Waves.
– 2016-2021 : Board member of GDR “METAmateriaux Acoustiques pour l'Ingénierie”.
– 2016-2021 : Member of National Recruiting Committee at CNRS (INSU, section 18).
– Since Oct. 2017 : Board member of Scientific Institute of Cargese.

I. PUBLICATIONS LIST AND BIBLIOMETRY
– 217 articles in peer-reviewed Journals (9 publications with more than 200 citations).
– 6 book chapters.
– 51 conference proceedings.
– 37 invited lectures in international meetings.
– 3 patents.

According to ISI Web of Science (August 2023)

J. SUPERVISION OF GRADUATE STUDENTS AND POSTDOCTORAL FELLOWS

Postdoctoral Fellows – with number of common papers :
E. Larose : March 2006-Oct 2006 – 6 ; A. Sukhovich : March 2008-Dec 2009 – 1 ; M. Corciuolo : June 2009-March 2012 – 2 ; L. Bonneau : Jan 2011-May 2012 – 1. F. Walter : Oct 2012-Oct 2014 – 1 ; A. Colombi : June 2013-Jan 2015 – 13 ; J. Riviere : Oct 2016-Oct 2018 ; M. Lott : Oct 2017-Oct. 2019 – 6 ; B. Tallon : Jan 2019-Dec. 2020 - 3 ;

PhD student supervision (year of defense)
Passed - with number of common papers
S. Conti (2005) - 9 ; S. Walker (2005) - 8 ; P. Gouedard (2008) - 5 ; I. Iturbe (2009) - 4 ; T. Gallot (2010) – 4 ; C. Marandet (2011) – 5 ; B. Froment (2011) – 2 ; E. Cros (2011) – 3 ; B. de Cacqueray (2012) - 3 ; F. Aulanier (2012) - 3 ; P. Boue (2013) - 3 ; E. Tudisco (2013) - 1 ; M. Rupin (2014) – 11 ; V. Clerc (2017) - 1 ; M. Chmiel (2017) - 3 ; M. A. Brossault (2017) – 2 ; J. Aichele (2019) – 1 ; C. Gradon (2019) - 2 ; T. Van Baarsel (2020) – 2

Current (with main research topic)
S. Ayaz (2023) – Seismic metamaterial

K. RESEARCH FOCUS
– Ocean acoustic tomography from vertical arrays of sources and receivers and experimental investigations at the laboratory scale : the sensitivity kernel approach.
– Experimental, numerical and theoretical study of spatio-temporal coherence of seismic ambient noise, with applications to high-resolution surface-wave imaging and monitoring.
– Advanced array processing on dense arrays to detect/localize microseismic events buried in noise (https://resolve.osug.fr/).
– Ultrafast imaging of transient deformation in 3D gels, with applications to high-resolution imaging of rupture dynamics of the friction surface.
– Metamaterial physics at the mesoscopic scale with laboratory & geophysics experiments (https://metaforet.osug.fr/).
– Ultrasonic experiments in fish schools in the multiple scattering regime : evaluation and monitoring of the biomass in lakes and aquaculture cages (https://echofish.osug.fr/).

L. ACTIVE COLLABORATIONS (number of co-authored papers)

W.A. Kuperman (Underwater acoustics), Scripps Inst. of Oceanography, San Diego (USA) – 47 papers.
M. Campillo (Geophysics), ISTerre, Grenoble (France) – 36 papers.
M. Fink (Complex wave physics), Institut Langevin, Paris (France) – 23 papers.
J. Mars (Signal processing), GIPSA-Lab, Grenoble (France) – 9 papers.
J. Virieux (Inversion), ISTerre, Grenoble (France) – 3 papers.
Y. Ben Zion (Fault zone), University of South California (USC), Los Angeles (USA) – 6 papers
P. Johnson (Rock physics), Los Alamos Laboratory, New Mexico (USA) - 2 papers

M. GRANTED PATENTS

– 1- July 2016 - Processing seismic data to remove noise, CGG Services S.A., US 20160209537A1, M.Chmiel, P. Roux, T. Bardainne.

– 2- Sept. 2013 - System and method for three-dimensional iterative filtering of scattered waves in cross-spread seismic system, CGG Services S.A., US 20140095079, B. de Cacqueray and P. Roux.

– 3- Oct. 2012 - Device and method for computing depth velocity variations, CGG Services S.A., CGG Services S.A., EP 2594964, US 20130131991, B. de Cacqueray, P. Roux, M. Campillo, S. Catheline, J. Meunier, T, Bianchi.

Publications

Philippe ROUX — 2012-12-05T11:26:00Z

Publication List – Philippe Roux — August 2023

Publication list

According to ISI Web of Knowledge :

http://www.researcherid.com/rid/B-8538-2014

https://www.researchgate.net/profile/Philippe_Roux2/

0 - Patents

3- July 2016 - Processing seismic data to remove noise, CGG Services S.A., US 20160209537A1, M. Chmiel, P. Roux, T. Bardainne.

2- Sept. 2013 - System and method for three-dimensional iterative filtering of scattered waves in cross-spread seismic system, CGG Services S.A., US 20140095079, B. de Cacqueray and P. Roux.

1- Oct. 2012 - Device and method for computing depth velocity variations, CGG Services S.A., EP 2594964, US 20130131991, B. de Cacqueray, P. Roux, M. Campillo, S. Catheline, J. Meunier, T, Bianchi.

1- Book Chapter

6- Philippe Guéguen, Philippe Roux, Andrea Colombi
Urban Seismology : Experimental Approach to Soil–Structure Interaction Towards the Concept of Meta-city,
Deterministic Numerical Modeling of Soil–Structure Interaction, chap. 5, edited by Stéphane Grange & Diana Salciarini, Wiley Online Library, doi:10.1002/9781119887690.ch5, 2021.

5- Martin Lott and Philippe Roux
Locally resonant metamaterials for plate waves : the respective role of compressional versus flexural resonances of a dense forest of vertical rods,
Fundamentals and Applications of Acoustic Metamaterials, edited by Vicente Romero, ISTE Ltd, DOI : 10.1002/9781119649182, 2019.

4- Philippe Roux, Matthieu Rupin, Fabrice Lemoult, Geoffroy Lerosey, Andrea Colombi, Richard Craster, Sébastien Guénneau, W. A. Kuperman and Earl G. Williams,
New Trends toward locally-resonant metamaterials at the mesoscopic scale
World Scientific Handbook of Metamaterials and Plasmonics, Edited by R. Craster and S. Guenneau, Vol. 2, Chap. 6, pp. 251-300, 2017.

3- Michel Campillo and Philippe Roux
Seismic imaging and monitoring with ambient noise correlations
Treatise on Geophysics, second Edition, Vol. 1, Edited by B. Romanowicz and A. Dziewonski, Elsevier-Amsterdam, 256-271, 2014.

2- Michel Campillo, Philippe Roux and Nikolai M. Shapiro
Correlation of seismic ambient noise to image and to monitor the solid earth
Encyclopedia of Solid Earth Geophysics, Edited by Harsh K. Gupta, Springer, 1230-1235, 2011.

1- W.A. Kuperman and Philippe Roux,
Underwater Acoustics
Handbook of Acoustics, pp. 149-204, Springer Verlaag, 2007.

2- Research Articles

216- Josefine Umlauft, Christopher William Johnson, Philippe Roux, Daniel Trugman, Albanne Lecointre, Andrea Walpersdorf, Ugo Nanni, Florent Gimbert, Bertrand Rouet-Leduc, Claudia Hulbert, Stefan Ludtke and Paul Allan Johnson,
Mapping glacier basal sliding applying machine learning
In press, JGR Earth Surface, 2023.

215- Albanne Lecointre, Philippe Roux, Pierre-Antoine Bouttier, Christophe Picard and Violaine Louvet,
A graph approach for fast dense array inter-station phase delay interpretation
In press, Geophysical Journal International, 2023.

214- Tero Makinen, Jérome Weiss, David Amitrano, and Philippe Roux,
History effects in the creep of a disordered brittle material
In press, Physical Review Materials, 2023.

213- Johannes Aichele, Soumaya Latour, Stefan Catheline and Philippe Roux,
Dynamic full-field imaging of rupture radiation : Material contrast governs source mechanism,
Geophysical Research Letters, 50, e2022GL100473, DOI:10.1029/2022GL100473, 2023.

212- Thomas Gaubert-Bastide, Stéphane Garambois, Clarisse Borde, Christophe Voisin, Laurent Oxarango, Daniel Brito and Philippe Roux,
High-resolution monitoring of controlled water table variations from dense seismic-noise acquisitions
Water Resources Research, DOI : 10.1190/INT-2016-0010.1, 2022.

211 – Bruno Giammarinaro, Christina Tsarsitalidou, Gregor Hillers, Julien de Rosny, Leonard Seydoux, Stefan Catheline, Michel Campillo and Philippe Roux
Seismic surface wave focal spot imaging : numerical resolution experiments
Geophysical Journal International, ggac247 ; DOI : 10.1093/gji/ggac247, 2022.

210- Longyu Jiang, Zhe Zhang, and Philippe Roux
Three dimensional higher-order raypath separation in a shallow-water waveguide
JASA Express Lett. 2, 076001 ; DOI : 10.1121/10.0011810, 2022.

209- Agathe Serripierri, Ludovic Moreau, Pierre Boue, Jerome Weiss, and Philippe Roux
Recovering and monitoring the thickness, density and elastic properties of sea ice from seismic noise recorded in Svalbard
The Cryosphere, 16 (6), 2527-2543, 2022.

208- Josselin Garnier et Philippe Roux,
Modal formulation and paraxial approximation for acoustic wave propagation in waveguides with surface perturbations
The Journal of the Acoustical Society of America, 151 (5), 3239-3254, 2022.

207- Ugo Nanni, Philippe Roux, Florent Gimbert and Albanne Lecointre
Dynamic imaging of glacier structures at high-resolution using source localization with a dense seismic array,
Geophys. Res. Letters, doi : 0.1029/2021GL095996, 2022.

206- Benoit Tallon, Philippe Roux, Guillaume Matte, Jean Guillard, John H. Page, and Sergey E. Skipetrov,
Ultra-Slow Acoustic Energy Transport in Dense Fish Aggregates
Scientific Reports, 11(1):17541, doi : 10.1038/s41598-021-97062-4, 2021

205- Ugo Nanni, Florent Gimbert, Philippe Roux and Albanne Lecointre,
Observing the subglacial hydrology network and its dynamics with a dense seismic array
PNAS, Vol. 118, No. 28, doi:10.1073/pnas.2023757118, 2021.

204- Martin Lott and Philippe Roux,
Random versus regular square lattice experimental comparison for a subwavelength resonant metasurface
The Journal of the Acoustical Society of America, 149, 3645, doi : 10.1121/10.0005060, 2021.

203- Florent Gimbert, Ugo Nanni, Philippe Roux, Agnès Helmstetter, Stéphane Garambois, Albanne Lecointre, Andréa Walpersdorf, Bruno Jourdain, Mickael Langlais, Olivier Laarman, Fabian Lindner, Amandine Sergeant, Christian Vincent, Fabian Walter
The RESOLVE project : a multi-physics experiment with a temporary dense seismic array on the Argentière Glacier, French Alps
Seismological Research Letters, 92 (2A), 1185-1201, 2021.

202-Josefine Umlauft, Fabian Lindner, Philippe Roux, Thomas Mikesell, Matthew Haney, Michael Korn, Fabian Walter
Stick-slip tremor beneath an alpine glacier
Geophysical Research Letters, DOI : 10.1029/2020GL090528, 2021.

201- Martin Lott, Philippe Roux, Matthieu Rupin, Daniel Colquitt and Andrea Colombi
Negative index metamaterial through multi-wave interactions : numerical proof of the concept of low-frequency Lamb-wave multiplexing
Scientific Reports, 11 (1), 1-8, 2021.

200- Małgorzata Chmiel, Philippe Roux, Marc Wathelet and Thomas Bardainne
Phase-velocity inversion from data-based diffraction kernels : seismic Michelson interferometer,
In press, Geophysical Journal International, DOI : 10.1093/gji/ggaa512, 2020.

199- Benoit Tallon, Philippe Roux, Guillaume Matte, Jean Guillard and Sergey E. Skipetrov
Acoustic Density Estimation of Dense Fish Shoals
Journal of the Acoustical Society of America – EL, DOI : 10.1121/10.0001935, 2020.

198- Chloé Gradon, Philippe Roux, Ludovic Moreau, Albanne Lecointre, Yehuda Ben Zion
Characterization with dense array data of seismic sources in the shallow part of the San Jacinto Fault Zone
Geophysical Journal International, DOI : 10.1093/gji/ggaa411, 2020.

197- Martin Lott, Philippe Roux, Adrien Pelat, Sergey Skipetrov and Andrea Colombi
Localized modes on a metasurface through multi-wave interactions
Physical Review Materials, DOI : 10.1103/PhysRevMaterials.4.065203, 2020.

196- Corentin Caudron, Marc De Batist, Guillaume Jouve, Guillaume Matte, Thomas Hermans, Adrian Flores-Orozco, Wim Versteeg, Zakaria Ghazoui, Philippe Roux, Jean Vandemeulebrouck, and Bernd Schmidt
Messages in the Bubbles
Eos, 101, DOI : 10.1029/2020EO143499. Published on 30 April 2020.

195- Benoit Tallon, Philippe Roux, Guillaume Matte, Jean Guillard and Sergey Skipetrov
Mesoscopic wave physics in fish shoals
AIP advances, DOI : 10.1063/5.0005145, 2020.

194- Philippe Guéguen, Marc-Antoine Brossault, Philippe Roux, Juan Carlos Singaucho,
Slow dynamics process observed in civil engineering structures to detect structural heterogeneities
Engineering Structures, 202, 109833, 2020.

193- Amandine Sergeant, Małgorzata Chmiel, Fabian Lindner, Fabian Walter, Philippe Roux, Julien Chaput, Florent Gimbert, and Aurélien Mordret
On the Green's function emergence from interferometry of seismic wavefields generated in high-melt glaciers : implications for passive imaging and monitoring
The Cryosphere, DOI : 10.5194/TC-14-1139-2020, 2020.

192- Martin Lott, Philippe Roux, Stéphane Garambois, Philippe Guéguen and Andrea Colombi,
Evidence of metamaterial physics at the geophysics scale : the METAFORET experiment
Geophysical Journal International, DOI : 10.1093/GJI/GGZ528, 2019.

191- Antonio Scala, Marcello Serra, Gaetano Festa and Philippe Roux,
Insight into the wave scattering properties of the Solfatara Volcano, Campi Flegrei, Italy,
Frontiers in Earth Science, DOI : 10.3389/FEART.2019.00307, 2019.

190- Tobias van Baarsel, Philippe Roux, Jerome Mars, Julien Bonnel, Michel Arrigoni, Steven Kerampran and Barbara Nicolas,
Dynamic imaging of a capillary-gravity wave in shallow water using amplitude variations of eigenbeams
Journal of the Acoustical Society of America, 146, 3353, 2019

189- Maria Saade, Kohtaro Araragi, Jean Paul Montagner, Edouard Kaminski,
Philippe Roux, Yosuke Aoki and Florent Brenguier,
Evidence of reactivation of a hydrothermal system from seismic anisotropy changes
Nature Communications (2019), https://doi.org/10.1038/s41467-019-13156-8.

188- Malgorzata Chmiel, Philippe Roux, Thomas Bardainne,
High-sensitivity microseismic monitoring : automatic detection and localization using matched-field processing and dense patch arrays
Geophysics 84(6), 1-14, 2019.

187- Geoffroy J. Aubry and Philippe Roux
Topological effects of a vorticity filament on the coherent backscattering cone
Phys. Rev. Lett. 123, 035503 – Published 18 July 2019

186- Martin Lott and Philippe Roux
Effective impedance of a locally resonant metasurface
Phys. Rev. Materials 3, 065202 – Published 7 June 2019

185- Chloé Gradon, Ludovic Moreau, Philippe Roux, Yehuda Ben Zion
Analysis of surface and seismic sources in dense array data with Match Field Processing and Markov Chain Monte Carlo sampling
Geophysical Journal International, Volume 218, Issue 2, August 2019, 1044–1056

184- Aurelien Mordret, Philippe Roux, Pierre Boue and Yehuda Ben-Zion
Shallow 3-D structure of the San Jacinto Fault zone revealed from ambient noise imaging with a dense seismic array
Geophysical Journal International, 216 (2), 896-905, FEB 2019

183- Perry Naughton, Philippe Roux, Schurgers, Curt, Kastner, Ryan, Jaffe, Jules S. and Roberts Paul L. D.
Self-localization of a mobile swarm using noise correlations with local sources of opportunity
Journal of the Acoustical Society of America,144 (5), 2811-2823, 2018.

182- Longyu Jiang, Philippe Roux and Jerôme I. Mars,
Raypath separation with a high-resolution algorithm in a shallow-water waveguide
IEEE Journal of Oceanic Engineering 43 (1), 119-130, 2018.

181- M. Wathelet, B. Guillier, P. Roux, C. Cornou and M. Ohrnberger
Rayleigh wave Three-component Beamforming : signed ellipticity assessment from high-resolution frequency-wavenumber processing of ambient vibration arrays
Geophysical Journal International 215 (1), 507-523, 2018.

180- Malgorzata Chmiel, Philippe Roux, Philippe Herrmann, Baptiste Rondeleux, Marc Wathelet
Data-based diffraction kernels for surface waves from convolution and correlation processes through active seismic interferometry
Geophysical Journal International, 214 (2),1468–1480, 2018.

179- Marceau Gresse, Jean Vandemeulebrouck, Svetlana Byrdina, Giovanni Chiodini, Philippe Roux, Antonio Rinaldi, Marc Wathelet, Tullio Ricci, Jean Letort, Zaccaria Petrillo, Paola Tuccimei, Carlo Lucchetti, and Alessandra Sciarra
Anatomy of a fumarolic system inferred from a multiphysics approach
Scientific Reports 8 (1), 7580, 2018

178- Brossault, MA, Roux P, Guéguen P
The fluctuation–dissipation theorem used as a proxy for damping variations in real engineering structures
Engineering Structures, 167, 65-73, 2018.

177- Sébastien Guenneau, Stefan Enoch, Andrea Colombi, Philippe Roux, Stéphane Brule
Métamatériaux pour la protection sismique,
Photoniques, 37-40, 2018.

176- Philippe Roux, Dino Bindi, Tobias Boxberger, Andrea Colombi, Fabrice Cotton, Isabelle Douste-Bacque, Stéphane Garambois, Philippe Gueguen, Gregor Hillers, Dan Hollis, Thomas Lecocq and Ildut Pondaven,
Toward seismic metamaterials : the METAFORET project
Seismological Research Letters, 89, 582-593, 2018.

175- O. Amoroso, G. Festa, P. P. Bruno, L. D'Auria, G. De Landro, V. Di Fiore, S. Gammaldi, S. Maraio, M. Pilz, P. Roux, G. Russo, V. Serlenga, M. Serra, H. Woith, A. Zollo,
Integrated tomographic methods for seismic imaging and monitoring of volcanic caldera structures and geothermal area,
J. Appl. Geophysics., 2017.

174- Perry Naughton, Philippe Roux, Curt Schurgers, Ryan Kastner, Jules Jaffe and Paul Roberts,
Self-localization of a deforming swarm of underwater vehicles using impulsive sources of opportunity,
IEEE Access, vol. 6, 1635-1646, 2017.

173-Lise Retailleau, Matthieu Landes, Lucia Gualtieri, Nikolai M. Shapiro, Michel Campillo, Philippe Roux, Jocelyn Guilbert,
Detection and analysis of a transient energy burst with beamforming of multiple teleseismic phases,
Geophys. J. Int. 212(1), 14-24, 2017.

172-Aida Hejazi Nooghabi, Lapo Boschi, Philippe Roux, and Julien de Rosny
Coda reconstruction from cross-correlation of a diffuse field on thin elastic plates
Physical Review E, 96(3), 032137, DOI : 10.1103/PhysRevE.96.032137, 2017.

171- Andrea Colombi, Richard Craster, Daniel John Colquitt, Sebastien Guenneau, Younes Achaoui, Philippe Roux and Matthieu Rupin,
Elastic wave control beyond band-gaps : shaping the flow of waves in plates and half-spaces with subwavelength resonant rods
Frontiers in Mechanical Engineering, section Mechanics of Materials, doi : 10.3389/fmech.2017.00010, 2017.

170- Maria Saade, Jean-Paul Montagner, Philippe Roux, K. Shiomi, B. Enescu, Florent Brenguier.
Monitoring of seismic anisotropy at the time of the 2008 Iwate-Miyagi (Japan) earthquake
Geophysical Journal International 211 (1), 483-497, 2017.

169- Philippe Roux and Yehuda Ben-Zion,
Rayleigh phase velocities in Southern California from beamforming short duration ambient noise
Geophysical Journal International 211 (1), 450-454, 2017.

168- Matthieu Rupin and Philippe Roux,
A multi-wave elastic metamaterial based on degenerate local resonances
Journal of the Acoustical Society of America Express Letters 142(1), EL75-81, 2017.

167- Andrea colombi, Victoria Ageeva, Richard Smith, Adam Clare, Rikesh Patel, Matt Clark, Daniel Colquitt, Philippe Roux, Sébastien Guenneau, and Richard Craster,
Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces
Scientific Reports 7, 6750, doi : 10.1038/s41598-017-07151-6, 2017.

166- Earl G. Williams, Jeffery D. Tippmann, Sandrine T. Rakotonarivo, Philippe Roux and W.A. Kuperman,
Experimental estimation of in vacuo structural admittance using random sources in a non-anechoic room,
Journal of the Acoustical Society of America, 142(1), 103-109, 2017.

165- L. Jiang, W. Song, Z. Zhang, C.Yang, S. Wang, and P. Roux,
Fast raypath separation based on low-rank matrix approximation in a shallow-water waveguide,
JASA express Letter 143 (1), EL271-EL278, 2017.

164- Daniel J. Colquitt, Andréa Colombi, Richard V. Craster, Philippe Roux and Sébastien Guénneau,
Seismic metasurfaces : Sub-wavelength resonators and Rayleigh wave interaction

163- Longyu Jiang, Yaping Hong, Philippe Roux, Jiasong Wu, Huazhong Shu,
Active wideband higher-order raypath separation in multipath environment
JASA express Letter 141(1), EL38-EL44, 2017.

162- Perry Naughton, Philippe Roux, Riley Yeakle, Curt Schurgers, Ryan Kastner, Jules S. Jaffe and Paul L. D. Roberts,
Ambient Noise Processing on a Mobile Deformable Array
The Journal of the Acoustical Society of America, 140 (6), 4260-4270, 2017.

161- Gregor Hillers, Philippe Roux, Michel Campillo and Yehuda Ben-Zion
Focal spot imaging based on zero lag cross correlation amplitude fields : Application to dense array data at the San Jacinto fault zone
Journal of Geophysical Research - Solid Earth, 121(11), 8048-8067, 2016.

160- Malgorzata Chmiel, Philippe Roux and Thomas Bardainne
Extraction of phase and group velocities from ambient surface noise in a patch-array configuration
Geophysics, 81 (6), KS231-KS240, 2016.

159-Philippe Guéguen, Paul Johnson and Philippe Roux,
Nonlinear dynamics induced in a structure by seismic and environmental loading
The Journal of the Acoustical Society of America, 140 (1), 582-590, 2016.

158- Andrea Colombi, Daniel Colquitt, Philippe Roux, Sébastien Guenneau, and Richard Craster,
A seismic metamaterial : The resonant metawedge
Scientific Reports 6, 27717, 2016.

157- Philippe Roux, Ludovic Moreau, Albanne Lecointre, Gregor Hillers, Michel Campillo, Yehuda Ben-Zion, Dimitri Zigone and Frank Vernon,
A methodological approach toward high-resolution surface wave imaging of the San Jacinto Fault Zone using ambient-noise recordings at a spatially dense array
Geophysics Journal International, 206, 980-992, 2016.

156- Andrea Colombi, Sébastien Guenneau, Philippe Roux, and Richard Craster
Transformation seismology : composite soil lenses for steering surface elastic Rayleigh waves
Scientific Reports 6, 25320, 2016.

155- Marcello Serra, Gaetano Festa, Philippe Roux, Marceau Gresse, Jean Vandemeulebrouck and Aldo Zollo,
A strongly heterogeneous hydrothermal area imaged by surface waves : the case of Solfatara, Campi Flegrei, Italy,
Geophysics Journal International 205(3), 1813-1822, 2016.

154- John Y. Yoritomo, Richard L. Weaver, Philippe Roux, Matthieu Rupin and Earl G. Williams,
On band gap predictions for multiresonant metamaterials on plates (L),
J. Acous. Soc. Am., 139 (3), 1282-1284, 2016.

153- Nori Nakata, Pierre Boue, Florent Brenguier, Philippe Roux, Michel Campillo, and Valérie Ferrazzini
Body- and surface-wave reconstruction from seismic-noise correlations between arrays at Piton de la Fournaise volcano
Geophysical Research Letters 43(3), 1047-1054, 2016.

152- Andrea Colombi, Philippe Roux, Sebastien Guenneau, Philippe Gueguen, and
Richard V. Craster
Forests as a natural seismic metamaterial : Rayleigh wave bandgaps induced by local resonances
Scientific Reports 6, 19238, 2016.

151- J. Chaput, V. Clerc, M. Campillo, P. Roux and H. Knox
On the practical convergence of coda-based correlations : A window optimization approach
Geophysical Journal International 204 (2), 704-715, 2016.

150- G. Olivier, F. Brenguier, M. Campillo, P. Roux, N.M. Shapiro and R. Lynch
Investigation of co- and post-seismic processes using in-situ measurements of seismic velocity variations in an underground mine
Geophysical research Letters 42(21), 9261-9269, 2016.

149- F. Brenguier, P. Kowalski, N. Nakata , P. Boué, N. Ackerley, M. Campillo, E. Larose, S. Rambaud, C. Pequegnat, T. Lecocq, P. Roux, V. Ferrazzini, N. Villeneuve, N. M. Shapiro and J. Chaput
Towards 4-D noise-based seismic probing of volcanoes : Perspectives from a Large-N experiment on Piton de la Fournaise Volcano,
Seismological Research Letters 87 (1), 15-25, 2016.

148- Matthieu Rupin, Philippe Roux, Geoffroy Lerosey, and Fabrice Lemoult
Symmetry issues in the hybridization of multi-mode waves with resonators : an example with Lamb waves metamaterial,
Scientific Reports 5, 13714, 2015.

147-Earl G. Williams, Philippe Roux, Matthieu Rupin and W. A. Kuperman
Theory of multi-resonant metamaterials for A0 Lamb waves
Phys. Rev. B, 91, 104307, 2015.

146- Andrea Colombi, Philippe Roux, Sébastien Guenneau, and Rupin Matthieu
Directional cloaking of flexural waves in a plate with a locally resonant metamaterial
The Journal of the Acoustical Society of America 137 (4), 1783-1789, 2015.

145- Fabian Walter, Philippe Roux, Claudia Röösli, Albanne Lecointre, Debi Kilb and Pierre-Francois Roux
Using glacier seismicity for phase velocity measurements and Green's function retrieval
Geophysical Journal International 201 (3), 1722-1737, 2015.

144- E. Tudisco, P. Roux, S. A. Hall, G.M.B. Viggiani and G. Viggiani,
Timelapse ultrasonic tomography for measuring damage localization in geomechanics laboratory tests,
Journal of the Acoustic Society of America, 137(3), 1389-1400, 2015.

143- G. Olivier, F. Brenguier, M. Campillo, R. Lynch and P. Roux,
Body-wave reconstruction from ambient seismic noise correlations in an underground mine,
Geophysics, 80 (3), KS11-KS25, 2015.

142- B. De Cacqueray, P. Roux and M. Campillo,
Using slowness and azimuth fluctuations as new observables for four-dimensional reservoir seismic monitoring
Geophysical Prospecting, DOI : 10.1111/1365-2478.12338, Nov. 2015.

141- M. Saade, J.P. Montagner, P.Roux, P. Cupillard, S. Durand and F. Brenguier,
Influence of seismic anisotropy on the cross correlation tensor : numerical investigations,
Geophys. J. Int., 201 (2), 595-604, 2015.

140- J. Chaput, M. Campillo, R. C. Aster, P. Roux, P.R. Kyle, H. Knox and P. Czoski,
Multiple scattering from icequakes at Erebus Volcano, Antarctica ; Implications for imaging at glaciated volcanoes,
Journal of Geophysical Research : Solid Earth, 120, doi:10.1002/2014JB011278, 2015.

139- M. Rupin, S. Catheline and P. Roux,
Super-resolution experiments on Lamb waves using a single emitter,
Applied Physics Letters 106, 024103, 2015.

138- L. Retailleau, N. M. Shapiro, J. Guilbert, M. Campillo and P. Roux,
Detecting and locating events with using USArray as a large antenna
Advances in Geosciences 40, 27-30, Jan. 2015.

137- Dimitri Zigone, Yehuda Ben-Zion, Michel Campillo and Philippe Roux
Seismic tomography of the Southern California plate boundary region from noise-based Rayleigh and Love waves
Pure and Applied Geophysics, 172, 1007-1032, doi : 10.1007/s00024-014-0872-1, 2015.

136- A. Colombi, J. Chaput, F. Brenguier, G. Hillers, P. Roux and M. Campillo
On the temporal stability of ambient noise correlations,
Compte Rendu de l'Académie des Sciences 346, 307-316, Nov. 2014.

135-P. Roux, P. Guéguen, L. Baillet and A. Hamze
Structural-change localization and monitoring through a perturbation-based inverse problem,
J. Acoust. Soc. Am. 136 (5), 2586-2597, Nov. 2014.

134- L. Retailleau, N.M. Shapiro, J. Guilbert, M. Campillo and P. Roux
Antipodal focusing of seismic waves observed with the USArray
Geophys. J. Int. 199, 1030-1042, Sept. 2014.

133- Aurélien Mordret, Matthieu Landès, Nikolai M. Shapiro, Satish Singh, Philippe Roux,
Ambient noise surface-wave tomography to determine the shallow shear velocity structure at Valhall : depth inversion with a Neighbourhood Algorithm
Geophys. J. Int. 198(3), 1514-1525, Sept. 2014.

132-Andrea Colombi, Philippe Roux, and Matthieu Rupin,
Sub-wavelength energy trapping of elastic waves in a meta-material
Journal of the Acoustic Society of America, 136(2), EL192-196, August 2014.

131-Gregor Hillers, Michel Campillo, Yehuda Ben-Zion and Philippe Roux,
Seismic fault zone trapped noise
Journal of Geophysical Research : Solid Earth, 119, 5786-5799, doi : 10.1002/2014JB011217, June 2014.

130- Matthieu Rupin, Stéfan Catheline and Philippe Roux
One-Channel Inverse Filter : spatio-temporal control of a complex wave-field from a single point
Applied Physics letters, 104 (24), 244101, June 2014

129- Matthieu Rupin, Fabrice Lemoult, Geoffroy Lerosey and Philippe Roux
Experimental demonstration of ordered and disordered multi-resonant metamaterials for Lamb waves,
Physical Review Letters, 112, 234301, 2014

128-Haijiang Zhang, Monica Maceira, Philippe Roux, and Clifford Thurber
Joint Inversion of Body-Wave Arrival Times and Surface-Wave Dispersion for Three-Dimensional Seismic Structure Around SAFOD
Pure and Applied Geophysics, doi : 10.1007/s00024-014-0806-y, 2014.

127- Selda Yildiz, Philippe Roux, Sandrine Rakotonarivo, Christian Marandet, and W. A. Kuperman
Target localization through a data-based sensitivity kernel : A perturbation approach applied to a multistatic configuration
Journal of the Acoustic Society of America, 135(4), 1800-1807, 2014.

126- Philippe Roux and Barbara Nicolas,
Inverting for a deterministic surface gravity wave using the sensitivity-kernel approach
Journal of the Acoustic Society of America, 135(4), 1789-1799, 2014.

125- Pierre Boue, Michel Campillo, Piero Poli and Philippe Roux
Reverberations, coda waves and ambient noise : correlations at the global scale and retrieval of the deep phases
Earth and Planetary Science Letter 391, 137-145, 2014

124- Andrea Colombi, Lapo Boschi, Philippe Roux, and Michel Campillo
Green's function retrieval through cross-correlations in a two-dimensional complex reverberating medium
Journal of the Acoustic Society of America, 135 (3), 1034-1043, 2014.

123- Pierre Boue, Philippe Roux, Michel Campillo and Xavier Briand,
Phase velocity tomography of surface waves using ambient noise cross-correlation and array processing,
Journal of Geophysical Research, 119, 519-529, 2014.

122- Philippe Roux and Yehuda Ben Zion
Monitoring fault zone environments with correlation of earthquake waveforms
Geophysics Journal International 196 (2),1073-1081, Feb. 2014.

121- Florian Aulanier, Philippe Roux, Barbara Nicolas, Romain Brossier, and Jerome Mars
Shallow water acoustic tomography from angle measurements instead of travel-time measurements
Journal of the Acoustic Society of America, 134, EL373-379, Sept. 2013.

120- Florian Aulanier, Barbara Nicolas, Philippe Roux, and Jerome Mars
Time-angle sensitivity kernels for sound-speed perturbations in a shallow ocean
Journal of the Acoustic Society of America, 134(1), 88-96, July 2013.

119- Philippe Roux, Christian Marandet, Barbara Nicolas, and William A. Kuperman,
Experimental measurement of the acoustic sensitivity kernel
Journal of the Acoustic Society of America, 134(1), EL38-44, July 2013.

118- Pierre Boue, Piero Poli, Michel Campillo, Helle Pedersen, Xavier Briand and Philippe Roux,
Teleseismic correlations of ambient seismic noise for deep global imaging of the Earth
Geophysics Journal International, doi:10.1093/gji/ggt160, May 2013.

117- Aurélien Mordret, Nikolai M. Shapiro, Satish Singh, Philippe Roux, Jean-Paul Montagner and Olav I. Barkved,
Azimuthal Anisotropy at Valhall : the Helmholtz Equation Approach
Geophysics Research Letters, doi : 10.1002/grl.50447, April 2013.

116- Jean Vandemeulebrouck, Philippe Roux and Estelle Cros
The plumbing of Old Faithful Geyser revealed by hydrothermal tremor
Geophysics Research Letters, doi : 10.1002/grl50422, March 2013.

115-Aurélien Mordret, Matthieu Landès, Nikolai M. Shapiro, Satish Singh, Philippe Roux and O. I. Barkved
Near surface study at the Valhall oil field from ambient noise surface wave tomography,
Geophysical Journal International, doi : 10.1093/gji/ggt061, March 2013.

114- Philippe Roux, W.A. Kuperman, Bruce D. Cornuelle, Florian Aulanier, W.S. Hodgkiss and Hee Chun Song,
Analyzing sound speed fluctuations in shallow water from group-velocity versus phase-velocity data representation,
The Journal of the Acoustical Society of America 133, pp. 1945-1952, April 2013.

113- Pierre Boue, Philippe Roux, Michel Campillo and Benoit de Cacqueray,
Double beamforming processing in a seismic prospecting context,
Geophysics, 78 (3), V101-V108, May 2013.

112-Shane W. Lani, Karim G. Sabra, W.S. Hodgkiss, W. A. Kuperman and Philippe Roux,
Coherent processing of shipping noise for ocean monitoring
JASA Express Letters 133, EL108-113, Feb 2013.

111- Aurélien Mordret, Nikolai M. Shapiro, Satish S. Singh, Philippe Roux and Olav I. Barkved
Helmholtz tomography of ambient noise surface wave data to estimate Scholte wave phase velocity at Valhall Life of the Field,
Geophysics, 78, March 2013.

110- Benoit de Cacqueray, Philippe Roux, Michel Campillo, and Stefan Catheline
Tracking of velocity variations at depth in the presence of surface velocity fluctuations
Geophysics 78, Jan. 2013.

109- Mikael Ali, Philippe Guéguen, Pierre-Yves Bard, Philippe Roux and Mickael Langlais,
The analysis of long-term frequency and damping wandering in buildings using the Random Decrement Technique,
Bull seism. Soc. Am., 103(1), pp. 236-246, doi 10.1785/0120120048, 2013.

108- Gregoire Le Touze, Barbara Nicolas, Jerome I. Mars, Philippe Roux and Benoit Oudompheng
Double-Capon and Double-MUSICAL for arrival separation and observable estimation in an acoustic waveguide
Eurasip Journal on Advances in Signal Processing 2012:187, August 2012.

107- Dimitri Zigone, Diane Rivet, Mathilde Radiguet, Michel Campillo, Christophe Voisin, Nathalie Cotte, Andrea Walpersdorf, Nikolai M. Shapiro, Glenn Cougoulat, Philippe Roux, Vladimir Kostoglodov, Allen Husker, Juan S. Payero
Triggering of Tremors and Slow Slip event in Guerrero (Mexico) by the 2010 Mw 8.8 Maule, Chile, Earthquake.
J. Geophys. Res., 117, B09304, Sept. 2012

106- Margherita Corciulo, Philippe Roux, Michel Campillo, Dominique Dubucq and W. A. Kuperman
Multiscale matched-field processing for noise-source localization in exploration geophysics
Geophysics, 77, 33-41, Sept. 2012.

105- Margherita Corciulo, Philippe Roux, Michel Campillo and Dominique Dubucq
Instantaneous phase variation for seismic velocity monitoring from ambient noise at the exploration scale
Geophysics, 77, 37-44, July. 2012.

104- Charlotte Leroy, Shane Lani, Karim Sabra, William Hodgkiss, William Kuperman, and Philippe Roux,
Enhancing the emergence rate of coherent wavefronts from ocean ambient noise correlations using spatio-temporal filters
J. Acoust. Soc. Am., 132 (2), 883-893, August 2012.

103- Hillers G, Campillo M, Lin YY, Ma KF and Roux P
Anatomy of the high-frequency ambient seismic wave field at the TCDP borehole
J. Geophys. Res., 117, 6301, June 2012.

102- Jean Letort, Philippe Roux, Jean Vandemeulebrouck, Olivier Coutant, Estelle Cros Marc Wathelet, C. Cardellini and R. Avino,
High-resolution shallow seismic tomography of a hydrothermal area : application to the Solfatara, Pozzuoli
Geophys. J. Int., 189 (3), 1725-1733, June 2012

101- Jit Sarkar, Christian Marandet, Philippe Roux, Shane Walker, Bruce D. Cornuelle and W.A. Kuperman,
Sensitivity kernel for surface scattering in a waveguide,
J. Acoust. Soc. Am., 131 (1), 111-118, Jan. 2012.

100 - Thomas Gallot, Stefan Catheline, Philippe Roux, and Michel Campillo
A passive inverse filter for Green's function retrieval
J. Acoust. Soc. Am., 131(2), EL21-27, Jan. 2012.

99- S.T. Rakotonarivo, S.C Walker, W.A. Kuperman and Ph. Roux
Remote localization of a small change in a multiple scattering environment without full modelling of the heterogeneous medium
J. Acoust. Soc. Am., 130(6), 3566-3573, Nov. 2011.

98- E. Cros, Ph. Roux, J. Vandemeulebrouck and S. Kedar,
Locating hydrothermal acoustic sources at Old Faithful geyser using Matched-Field processing,
Geophys. J. Int., 187(1), 385-393, Oct. 2011.

97- Bérénice Froment, Michel Campillo and Philippe Roux
Reconstructing the Green's function through iteration of correlations
Compte Rendu de l'Académie des Sciences, 343, 623-632, Oct. 2011.

96- Philippe Roux, W.A. Kuperman and Karim G. Sabra
Ocean acoustic noise and passive coherent array processing
Compte Rendu de l'Académie des Sciences, 343, 533-547, Oct. 2011.

95- Philippe Roux, Ion Iturbe, Barbara Nicolas, Jean Virieux and Jerome Mars,
Travel-time tomography in shallow water : Experimental demonstration at an ultrasonic scale,
J. Acoust. Soc. Am., 130(3), 1232-1241, Sept. 2011.

94- Philippe Roux, Antoine Roueff and Marc Wathelet,
The San Andreas Fault revisited through seismic-noise and surface-wave tomography
Geophys. Res. Lett., 38, L13319, July 2011.

93- Philippe Roux, Christian Marandet, Patrick La Rizza and W.A. Kuperman,
Application of acoustic feedback to target detection in a waveguide : Experimental demonstration at the ultrasonic scale
J. Acoust. Soc. Am., 130 (1), 13-19, July 2011.

92- S. Durand, J.P. Montagner, P. Roux, F. Brenguier, R.M. Nadeau and Y. Ricard
Passive monitoring of anisotropy change for the Parkfield 2004 earthquake
Geophys. Res. Lett., 38, L13303, July 2011.

91- J. Bonnel, C. Gervaise, P. Roux, B. Nicolas and J. Mars,
Modal depth function estimation using time-frequency analysis
J. Acoust. Soc. Am., 130 (1), 61-71, July. 2011.

90- Benoit De Caqueray, Philippe Roux, Michel Campillo, Stefan Catheline and Pierre Boue,
Elastic-wave identification and extraction through array processing : an experimental investigation at the laboratory scale,
Journal of Applied Geophysics, 74, 81-88, July 2011

89- C. Hadziioannou, E. Larose, A. Baig, P. Roux and M. Campillo,
Improving temporal resolution in ambient noise monitoring of seismic speed,
J. Geophys. Res., 116, B07304, doi:10.1029/2011JB008200, July 2011.

88- Thomas Gallot, Stéfan Catheline, Philippe Roux, Javier Brum and Carlos Negreira,
Passive Elastography : Shear-Wave Tomography from Physiological-Noise Correlation in Soft Tissues
IEEE Trans on Ultrasonics, Ferroelectrics and Freq. Control 58 (6), 1122-1126, June 2011.

87- Stefan Catheline, Thomas Gallot, Philippe Roux, Guillemette Ribay and Julien de Rosny
Coherent backscattering enhancement in cavities. The simple-shape cavity revisited
Wave Motion, Volume 48, Issue 3, 214-222, April 2011.

86-Thomas Gallot, Stefan Catheline and Philippe Roux,
Coherent backscattering enhancement in cavities. Highlights of the role of symmetry
J. Acoust. Soc. Am. 129 (4), 1963-1971, April 2011.

85- Pierre Gouedard, Philippe Roux, Michel Campillo, Arie Verdel, Huajian Yao, Robert D. van der Hilst
Source depopulation potential and surface wave tomography using a cross-correlation method in a scattering medium
Geophysics, 76 (2), SA51-61, March 2011.

84-Christian Marandet, Philippe Roux, Barbara Nicolas and Jerome Mars,
Target detection and localization in shallow water : an experimental demonstration of the acoustic barrier problem at the laboratory scale.
J. Acoust. Soc. Am. 129(1), 85-97, Jan. 2011.

83- Alexey Sukhovich, Philippe Roux and Marc Wathelet,
Geoacoustic inversion performed from two source-receive arrays in shallow water
J. Acoust. Soc. Am., 128(2), 702-710, June 2010.

82- Karim Sabra, Stephane Conti, Philippe Roux, Tuncay Akal, William Kuperman, James Stevenson, Alessandra Tesei, and Piero Guerrini
Experimental demonstration of a high-frequency forward acoustic barrier in a dynamic coastal environment,
J. Acoust. Soc. Am. 127 (6), pp. 3430-3439, June 2010.

81-Bérénice Froment, Michel Campillo, Philippe Roux, Pierre Gouédard, Arie Verdel and Richard Weaver,
Estimation of the effect of non-isotropically distributed energy on the apparent arrival time in correlations,
Geophysics, 75 (5), SA85–SA93, September 2010.

80- Philippe Roux, R. Lee Culver and Shane Walker,
Application of the Coherent-to-incoherent Intensity Ratio (CTIR) to estimating ocean surface roughness from high frequency, shallow water propagation measurements,
J. Acoust. Soc. Am., 127 (3), pp. 1258-1266, March 2010.

79- J. Vandemeulebrouck, P. Roux, P. Gouédard, A. Legaz, A. Revil, A.W. Hurst, A. Jardani, A. Bolève
Application of seismic noise and self-potential localization techniques to a buried hydrothermal vent (Waimangu Old Geyser site, New-Zealand),
Geophysical Journal International, 180 (2), pp. 883-890, Feb. 2010.

78- Philippe Roux
Passive seismic imaging with directive ambient noise : Application to surface waves on the San Andreas Fault (SAF) in Parkfield.
Geophysical Journal International, 179 (1), pp. 367-373, Oct. 2009

77- Ion Iturbe, Philippe Roux, Jean Virieux and Barbara Nicolas
Travel-time Sensitivity Kernels vs diffraction pattern obtained through double
beamforming in shallow water
J. Acoust. Soc. Am., 126 (2), pp. 713-720, Aug. 2009.

76-S.C. Walker, Philippe Roux and W.A. Kuperman,
Synchronized time-reversal focusing with application to remote imaging from a distant virtual source array,
J. Acoust. Soc. Am., 125(6), pp. 3828-3834, June 2009.

75- Celine Hadziioannou, Eric Larose, Olivier Coutant, Philippe Roux, and Michel Campillo,
Stability of Monitoring Weak Changes in Multiply Scattering Media with Ambient Noise Correlation : Laboratory Experiments,
J. Acoust. Soc. Am., 125(6), pp. 3688-3695, June 2009.

74- Ion Iturbe, Philippe Roux, Barbara Nicolas, Jean Virieux, and Jerome Mars,
Shallow water acoustic tomography performed from a double beamforming algorithm,
IEEE Journal of Oceanic Engeneering, 34 (2), 140-149, April 2009.

73-Antoine Roueff, Philippe Roux and Philippe Réfrégier,
Wave separation in ambient seismic noise using intrinsic coherence and polarization filtering,
Signal Process. 89 (4), pp. 410-421, April 2009.

72- Legaz A., Revil A., Roux P., Vandemeulebrouck J., Gouedard P., Hurst T., and Bolève A.,
Self potential and passive monitoring of hydrothermal activity : A case study at Iodone Pool, Waimangu geothermal Valley, New-Zealand,
J. Volcanol. Geotherm. Res., 179, pp. 11-18, Jan. 2009.

71- Philippe Roux, Bruce D. Cornuelle, W.A. Kuperman and W.S. Hodgkiss
The structure of ray-like arrivals in a shallow water waveguide
J. Acoust. Soc. Am., 124 (6), pp. 3430—3439, Dec. 2008.

70- Barbara Nicolas, Ion Iturbe, Philippe Roux and Jérôme I. Mars
Double beamforming for wave separation and identification : robustness against noise and application on FAF03 experiment
Traitement du Signal, 25(4), pp. 293-304, 2008.

69- Stephanie Fried, Karim Sabra, Philippe Roux, and William A. Kuperman
Extracting the local Green's function on a horizontal array from ambient ocean noise
J. Acoust. Soc. Am., 124 (4), Pages EL183-EL188, Oct. 2008.

68- Eric Larose, Philippe Roux, Michel Campillo and Arnaud Derode,
Fluctuations of correlations and Green function reconstruction : role of scattering,
Journal of Applied Physics 103, 114907, June 2008.

67- Pierre Gouédard, Philippe Roux, Michel Campillo and Arie Verdel
Convergence of the two-point correlation function toward the Green's function in the context of a seismic prospecting dataset,
Geophysics,Vol. 73 (6), 47-53, December 2008.

66- P. Gouedard, L. Stehly, F. Brenguier, M. Campillo, Y. Colin de Verdieres, E. Larose, L. Margerin, P. Roux, F. J. Sanchez-Sesma, N. M. Shapiro and R. L. Weaver,
Cross-correlation of random fields : mathematical approach and applications,
Geophysical Prospecting, 56, pp. 375-393, 2008.
2009 Best Paper Award of the EAGE (European Association of Geoscientists & Engineers).

65- J. Mark Stevenson, Alessandra Tesei, Piero Guerrini, Thomas Folégot, Karim Sabra, Philippe Roux, Heechun Song, William A. Kuperman, William S. Hodgkiss, and Tuncay Akal,
An Acoustic Tripwire Based on Forward Scattering in a Time-Reversal Mirror
US Navy's Journal of Undersea Acoustics, 61, 52-60, April 2007.

64- Franck-David Philippe, Philippe Roux and Didier Cassereau,
Iterative high-resolution wavenumber inversion applied to broadband acoustic data,
IEEE Trans. Ultrason. Ferr. Freq. Cont., 55 (10), 4638916, pp. 2306-2311, Oct. 2008.

63- Pierre Gouedard, Philippe Roux and Michel Campillo,
Small Scale seismic inversion using surface waves extracted from noise cross-correlation,
J. Acoust. Soc. Am., 123 (3), EL26-31, March 2008.

62- Pierre Gouedard, Cecile Cornou and Philippe Roux,
Phase-velocity dispersion curves and small-scale geophysics using noise cross-correlation techniques
Geophys. J. Int., 172, 971-981, June 2008.

61- Eric Larose, Philippe Roux and Michel Campillo,
Reconstruction of Rayleigh-Lamb dispersion spectrum based on noise obtained from an air-jet forcing,
J. Acoust. Soc. Am., 122(6), 3437-3444, Dec. 2007.

60- S.C. Walker, Philippe Roux and W.A. Kuperman,
Modal Doppler theory of an arbitrarily accelerating continuous-wave source applied to mode extraction in the oceanic waveguide,
J. Acoust. Soc. Am., 122 (3), pp.1426-1439, sept. 2007.

59- K. Sabra, S. Conti, P. Roux and W.A. Kuperman,
Passive in vivo elastography from skeletal muscle noise,
Applied Physics Letters 90, 194101, May 2007.

58- S. G. Conti, Philippe Roux and W. A. Kuperman
Near-Field Time Reversal Amplification
J. Acoust. Soc. Am., 121 (6), pp. 3602-3606, June 2007.

57- Alexandre Aubry, Arnaud Derode, Philippe Roux and Arnaud Tourin,
Coherent backscattering and far-field beamforming in acoustics,
J. Acoust. Soc. Am., 121(1), pp. 70-77, Jan. 2007.

56- S. C. Walker, W. A. Kuperman, and Philippe Roux
Active waveguide Green's function estimation with application to time-reversal focusing without a probe source in a range-independent waveguide
J. Acoust. Soc. Am., 120 (3), pp. 2755-2763, Nov. 2006.

55- W. J. Higley, Philippe Roux, and W. A. Kuperman
Relationship between time reversal and linear equalization in digital communications
J. Acoust. Soc. Am., 120 (1) , pp. 35-37, July 2006.

54- Karim G. Sabra, Philippe Roux, Peter Gerstoft, W. A. Kuperman and M.C. Fehler,
Extracting coda arrivals from cross-correlations of long period scattered waves during the Mount St. Helens 2004 eruption
Geophys. Res. Lett., 33, L06313, March 2006.

53- P. Gerstoft, K.G. Sabra, P. Roux, W.A. Kuperman, and M.C. Fehler,
Green's functions extraction and surface wave tomography from microseisms in Southern California,
Geophysics, 71 (4), pp. S123-S131, August 2006.

52- H.C. Song, Philippe Roux, W.S. Hodgkiss, W.A. Kuperman, T. Akal and M. Stevenson,
Multiple-Input/Multiple-Output coherent time reversal communications in shallow water
IEEE Journal of Oceanic Engineering, 31(1), pp. 170-178, Jan. 2006.

51- Karim G. Sabra, Philippe Roux, Hee Chun Song, W.A. Kuperman, W.S. Hodgkiss, Tuncay Akal and Mark Stevenson
Experimental demonstration of time reversed reverberation focusing in a rough waveguide. Application to target detection
J. Acoust. Soc. Am., 120 (3), pp. 1305-1314, Sept. 2006.

50- Stéphane G. Conti, Julien de Rosny, Philippe Roux and David A. Demer,
Characterization of scatterer motion in a reverberant medium
J. Acoust. Soc. Am., 119 (2), pp. 769-776, Feb. 2006.

49- J. de Rosny, Arnaud Derode, Arnaud Tourin, Philippe Roux and Mathias Fink,
Time-reversal focusing in a range-dependent ocean,
Oceans 2005 (1), 1511757, pp. 449-453, June 2005.

48- K. G. Sabra, P. Roux, W. A. Kuperman,
Emergence rate of the time-domain Greens function from the ambient noise cross-correlation function
J. Acoust. Soc. Am., 118 (6), pp. 3524-3531, Dec 2005.

47- J. de Rosny, C. Debever, S. Conti and P. Roux
Diffusive reverberant acoustic wave spectroscopy with absorbing scatterers
Appl. Phys. Lett, 87, 154104, October 2005.

46- Philippe Roux, Karim G. Sabra, Peter Gerstoft and W.A. Kuperman,
P-waves from cross-correlation of seismic ambient noise
Geophys. Res. Lett., 32, L19303, October 2005.

45- H.C. Song, W.S. Hodgkiss, W.A. Kuperman, Philippe Roux, T. Akal, M. Stevenson, Experimental demonstration of adaptive reverberation nulling using a time reversal mirror
J. Acoust. Soc. Am., 118 (3), pp. 1381-1387, September 2005.

44- Stéphane G. Conti, Philippe Roux, Christian Fauvel, Benjamin D. Maurer and David A. Demer
Acoustical monitoring of fish density, behavior, and growth rate in a tank
Aquaculture, 626590, July 2005.

43- K.G. Sabra, P. Gerstoft, P. Roux, W.A. Kuperman and M. Fehler,
Surface wave tomography from seismic ambient noise in Southern California
Geophys. Res. Lett., 32, L14311, July 2005.

42- J. de Rosny,Arnaud Tourin, Arnaud Derode, Philippe Roux, and Mathias Fink
Weak localization and time reversal of ultrasound in a rotational flow
Phys. Rev. Lett, 95, 074301, August 2005.

41- Shane C. Walker, Philippe Roux, W. A. Kuperman
Focal depth shifting of a time reversal mirror in a range-independent waveguide
J. Acoust. Soc. Am., 118 (3), pp. 1341-1347, September 2005.

40- Shane C. Walker, Philippe Roux and W.A. Kuperman
Data-based mode extraction with a partial water column spanning array
J. Acoust. Soc. Am., 118 (3), pp. 1518-1525, September 2005.

39- Karim G. Sabra, Philippe Roux, Aaron M. Thode, Gerald L. D'Spain, W.S. Hodgkiss and W.A. Kuperman
Using ocean ambient noise for array self-localization and self-synchronization
IEEE Journal of Oceanic Engineering, 30(2), pp. 338-347, April 2005.

38- W. J. Higley, Philippe Roux, W. A. Kuperman, W. S. Hodgkiss, H. C. Song, T. Akal and Mark Stevenson
Synthetic aperture time reversal in shallow water : experimental demonstration at sea
J. Acoust. Soc. Am. 118(4), pp. 2365-2372, October 2005.

37- Karim G. Sabra, Peter Gerstoft, Philippe Roux, W.A. Kuperman and Michael Fehler, Extracting time domain Green's function estimates from ambient seismic noise
Geophys. Res. Lett. 32, L03310, Feb. 2005.

36- Karim G. Sabra, Philippe Roux and W.A. Kuperman
Arrival structure of the time-averaged ambient noise cross-correlation function in an oceanic waveguide
J. Acoust. Soc. Am. 117(1), pp. 164-174, January 2005.

35- Philippe Roux, Karim G. Sabra, W.A. Kuperman and Andre Roux
Ambient noise cross-correlation in free space : theoretical approach
J. Acoust. Soc. Am. 117(1), pp. 79-84, 46, January 2005.

34- Philippe Roux and W.A. Kuperman
Time reversal from ambient noise
J. Acoust. Soc. Am., 117(1), pp. 131-136, January 2005.

33- Isabelle Charpentier and Philippe Roux
Mode and wavenumber inversion in shallow water using an adjoint method
Journal of Computational Acoustics, Vol. 12, No. 4 (2004) 521-542.

32- Kaelig Castor, Peter Gerstoft, Philippe Roux, W.A. Kuperman and B.E. McDonald,
Long range propagation of finite amplitude acoustic waves in an ocean waveguide
J. Acoust. Soc. Am., 116 (4), pp. 2004-2010, October 2004.

31- Philippe Roux and W.A. Kuperman,
Extracting coherent wavefronts from ocean ambient noise
J. Acoust. Soc. Am., 116 (4), pp. 1995-2003, October 2004.

30- Philippe Roux, W.A. Kuperman, W.S. Hodgkiss, Hee Chun Song, Tuncay Akal and Mark Stevenson,
A non reciprocal implementation of time reversal in the ocean
J. Acoust. Soc. Am., 116 (2), pp. 1009-1015, August 2004.

29- Philippe Roux, Didier Cassereau and André Roux,
A high-resolution algorithm for wavenumber estimation using holographic array processing
J. Acoust. Soc. Am., 115 (3), pp. 1059-1067, March 2004.

28- Stephane Conti, Philippe Roux, David Demer and Julien de Rosny
Measurement of the scattering and absorption cross-sections of the human body
Appl. Phys. Lett, 84 (5), pp. 819-821, Feb. 2004.

27- Julien de Rosny and Philippe Roux,
Reply to a Comment on “Multiple scattering in a reflecting cavity : Application to fish scattering”, JASA, 109 (6), 2001”
J. Acoust. Soc. Am., 115 (1), pp. 31-34, January 2004.

26- Tuncay Akal, W.A. Kuperman, W.S. Hodgkiss, Geoffrey F. Edelmann, Seongil Kim, Philippe Roux, Mark Stevenson, Piero Guerrini and Piero A. Boni,
Potential applications of ocean acoustic time-reversal mirrors
Sea Technology, 44 (11), pp. 25-29, November 2003.

25- Julien de Rosny, Philippe Roux, Mathias Fink and J.H. Page,
Field fluctuation spectroscopy in a reverberant cavity with moving scatterers
Phys. Rev. Lett, 90 (9), 094302, March 2003.

24- Philippe Roux and Mathias Fink,
Green's function estimation using secondary sources in a shallow water environment
J. Acoust. Soc. Am., 113 (3), pp. 1406-1416, March 2003.

23- Dave A. Demer, Stéphane Conti, Julien de Rosny and Philippe Roux,
Absolute measurement of total target strength from reverberation in a cavity
J. Acoust. Soc. Am., 113 (3), pp. 1387-1394, March 2003.

22- Stéphane Conti, Philippe Roux and Mathias Fink,
Depth and range shifting of a focal spot using a Time-reversal mirror in an acoustic waveguide
Appl. Phys. Lett, 80 (19), pp. 3647-3649, May 2002.

21- Gabriel Montaldo, Philippe Roux, Arnaud Derode, Carlos Negreira and Mathias Fink Ultrasound shock wave generator with one-bit time reversal in a dispersive medium, application to lithotripsy
Appl. Phys. Lett, 80 (5), pp. 897-899, Feb. 2002.

20- Gabriel Montaldo, Philippe Roux, Arnaud Derode, Carlos Negreira and Mathias Fink,
Generation of very high pressure pulse with 1-bit time reversal in a solid waveguide
J. Acoust. Soc. Am., 110 (6), pp. 2849-2857, Dec 2001.

19- Julien de Rosny and Philippe Roux
Multiple scattering in a reflecting cavity : Application to fish counting in a tank
J. Acoust. Soc. Am., 109 (6), pp. 2587-2597, June 2001.

18- Sébastien Manneville, Philippe Roux, Mickael Tanter, Agnès Maurel, Mathias Fink, Frédéric Bottausci and Philippe Petitjeans,
Scattering of sound by a vorticity filament : an experimental and numerical investigation
Phys. Rev. E, 63, 036607, March 2001.

17- Mathias Fink, Didier Cassereau, Arnaud Derode, Claire Prada, Philippe Roux, Mickael Tanter, Jean-Louis Thomas and François Wu,
Time-reversed acoustics
Reports on Progress in Physics, Vol. 63, N. 12, pp. 1933-1995, December 2000.

16- Philippe Roux and Mathias Fink,
Time-reversal in a waveguide : study of the spatial and temporal focusing
J. Acoust. Soc. Am., 107 (5), pp. 2418-2429, May 2000.

15- Hee C. Song, Philippe Roux and William A. Kuperman,
Focal translation by frequency shift in free space
IEEE Trans. Ultrason. Ferroelect. Freq. Contr., 47 (3), pp. 687-695, May 2000.

14- Philippe Roux, Arnaud Derode, Aymeric Peyre, Arnaud Tourin and Mathias Fink, Acoustical imaging through a multiple scattering medium using a time-reversal mirror
J. Acoust. Soc. Am., 107 (2), pp. L7-L12, Feb. 2000.

13- Philippe Roux, Michael B. Porter, Hee C. Song and William A. Kuperman,
Application of the Parabolic Equation Method to medical ultrasonics
Wave Motion, 31, pp. 181-196, Feb. 2000.

12- Philippe Roux, Julien de Rosny, Mathias Fink and James H. Rose,
Time-reversal Mirrors and Rough Surfaces : Experiments
J. Acoust. Soc. Am., 106 (2), pp. 724-732, August 1999.

11- James H. Rose, Mehmet Bilgen, Philippe Roux and Mathias Fink,
Time-reversal Mirrors and Rough Surfaces : Theory
J. Acoust. Soc. Am., 106 (2), pp. 716-723, August 1999.

10- Sébastien Manneville, Agnès Maurel, Philippe Roux and Mathias Fink,
Characterization of a large vortex using acoustic time-reversal mirrors
The European Physics Journal B, 9, pp. 545-549, 1999.

9- Arnaud Derode, Mathias Fink, Philippe Roux and Jean-Louis Thomas,
Ultrasonic wave propagation in random media
New Aspects of Electromagnetic and Acoustic Wave Diffusion, POAN Research Group, Springer Tracts in Modern Physics, pp. 51-61, March 1998.

8- Philippe Roux, Julien de Rosny, Michael Tanter and Mathias Fink,
The Aharonov-Bohm effect revisited by an acoustic time-reversal mirror
Phys. Rev. Lett, Vol.79, N.17, pp. 3170-3173, October 1997.

7- Arnaud Tourin, Arnaud Derode, Philippe Roux, Bart Van Tiggelen and Mathias Fink,
Time dependent coherent backscattering of acoustic waves
Phys. Rev. Lett, Vol.79, N.19, pp. 3637-3639, Nov. 1997.

6- Philippe Roux, Benoit Roman and Mathias Fink,
Time reversal in an ultrasonic waveguide
Appl. Phys. Lett, 70 (14), pp. 1811-1813, 7 Avril 1997.

5- Arnaud Derode, Philippe Roux and Mathias Fink,
Ultrasons : remonter le temps malgré le desordre
La Recherche, N 291, octobre 1996.

4- Arnaud Derode, Philippe Roux and Mathias Fink,
Robust acoustic time reversal with high–order multiple scattering
Phys. Rev. Lett, Vol.75, N.23, pp. 4206-4209, décembre 1995.

3- Philippe Roux and Mathias Fink,
Experimental evidence in acoustics of the violation of time-reversal invariance induced by vorticity
Europhysics Letters, 32 (1), pp. 25-29, octobre 1995.

2- Jean-Louis Thomas, Philippe Roux and Mathias Fink,
Inverse scattering analysis with an acoustic time-reversal mirror
Phys. Rev. Lett, Vol.72, N.5, janvier 1994.

1- Jean Guillard, Philippe Boet, Daniel Gerdeaux and Philippe Roux,
Application of mobile acoustic techniques fish surveys in shallow water : the river Seine
Regulated Rivers : Research & Management, Vol.9, pp. 121-126, 1994.

Voir en ligne : Researcher ID

Proposition de thèse en géophysique : Etude à petite échelle de dispositifs géophysique en 3D et 4D

Philippe ROUX — 2012-11-26T08:07:05Z

Thèse de 3 ans financée par CGGVeritas et proposée en collaboration avec l'Institut des Sciences de la Terre (ISTerre).

Encadrants :

Philippe Roux (CNRS/ISTerre), philippe.roux @ ujf-grenoble.fr,

Michel Campillo (UJF/ISTerre), michel.campillo @ ujf-grenoble.fr,

Benoit de Cacqueray (CGGV), benoit.de.cacqueray @ cggveritas.com

La sismique pétrolière est un domaine d'innovation continue depuis plus d'un siècle. Une part non négligeable des études concerne la séparation des différentes ondes se propageant dans les couches superficielles et en particulier la séparation des ondes de surface d'avec les ondes de volume.

A petite profondeur, les ondes de surfaces sont utilisables à des fins tomographiques. Bien les connaître et les modéliser permet de connaître et d'imager la proche surface. Quand la prospection est tournée vers les grandes profondeurs – ce qui correspond à 95% de l'industrie géophysique - ces ondes masquent les ondes de volume qui contiennent les informations sur les couches profondes. Il est donc fondamental de pouvoir s'en affranchir et l'étape de séparation est des plus importantes. Dans ces situations, ces ondes de surface peuvent malgré tout être utilisées pour une meilleure connaissance de la proche surface, ce qui permet d'en déduire après coup des paramètres utilisables pour améliorer l'imagerie en profondeur. La recherche s'est renouvelée dans ce domaine du fait de l'impulsion récente donnée par l'imagerie sismique passive à partir du bruit sismique ambiant ou la mise en place de nouvelles géométries d'acquisition.

En parallèle, l'étude des champs pétroliers existants pour une meilleure exploitation tend à se développer et constitue un axe significatif de développement industriel. La maîtrise de l'imagerie 4D (3 dimensions d'espace + le temps, appliquée à la surveillance de réservoir) devient dès lors une activité clé pour la recherche dans laquelle les variations des paramètres du sous-sol sont estimées.

Le cadre de cette thèse correspond à la séparation, l'étude et l'utilisation des différentes ondes à l'échelle du laboratoire sur de nouveaux dispositifs appelés à être testés sur le terrain.

A l'issue d'une première thèse en 2009/2012, un banc complet d'acquisition de données à haute densité spatiale a été réalisé au laboratoire ISTerre. Différents dispositifs d'acquisition et des algorithmes de traitement en 3D comme en 4D on pu être élaborés et testés avec succès.

L'objectif de cette thèse est de capitaliser sur le banc actuel et d'aborder de nouveaux thèmes d'études. La prise en compte du banc de mesure actuel et des ses améliorations - déplacement robotisé des sources - constitue une première étape. Cela permettra la mise en place de nouvelles géométries 3D d'acquisition, très à l'étude actuellement. En 4D, la comparaison de résultats de surveillance de réservoir à l'aide de sources actives et passives est envisagée et pourra s'appuyer sur l'expertise d'ISTerre concernant l'utilisation des corrélations de bruit ambiant.

Cette thèse pourrait faire suite à un stage de M2R de qualité. Elle concerne particulièrement une ou un étudiant(e) attiré(e) par les expérimentations en laboratoire et le traitement de données (Matlab). Le candidat devra montrer son gout pour la recherche en milieu industriel. Dans cette optique, si la thèse sera basée à l'ISTerre (Grenoble), elle comprendra des temps d'immersion dans l'entreprise (Massy).

B. de Cacqueray, P. Roux, M. Campillo S. Catheline and P. Boue, 2011, Elastic-wave identification and extraction through array processing : An experimental investigation at the laboratory scale, Journal of Applied Geophysics.

B. de Cacqueray, P. Roux, M. Campillo S. Catheline, accepted for Jan-Feb 2013, Tracking of velocity variations at depth in the presence of surface velocity fluctuations, Geophysics.

Proposition de thèse en géophysique : Etude à petite échelle de dispositifs géophysique en 3D et 4D

Anaïs SCHNEIDER, Philippe ROUX — 2012-11-26T08:07:05Z

Thèse de 3 ans financée par CGGVeritas et proposée en collaboration avec l'Institut des Sciences de la Terre (ISTerre).

Encadrants :

Philippe Roux (CNRS/ISTerre), philippe.roux @ ujf-grenoble.fr,

Michel Campillo (UJF/ISTerre), michel.campillo @ ujf-grenoble.fr,

Benoit de Cacqueray (CGGV), benoit.de.cacqueray @ cggveritas.com

B. de Cacqueray, P. Roux, M. Campillo S. Catheline and P. Boue, 2011, Elastic-wave identification and extraction through array processing : An experimental investigation at the laboratory scale, Journal of Applied Geophysics.

B. de Cacqueray, P. Roux, M. Campillo S. Catheline, accepted for Jan-Feb 2013, Tracking of velocity variations at depth in the presence of surface velocity fluctuations, Geophysics.

Research topics

Philippe ROUX — 2012-07-05T11:20:00Z

rapport d'activité 2006-2010

rapport d'activité 2010-2012

rapport d'activité 2012-2015

rapport d'activité 2015-2019

Rapport d'activité 2017-2022

Research focus– 2017-2022

– Ocean acoustic tomography from vertical arrays of sources and receivers and experimental investigations at the laboratory scale : the sensitivity kernel approach.
– Experimental, numerical and theoretical study of spatio-temporal coherence of seismic ambient noise, with applications to high-resolution surface-wave imaging and monitoring.
– Advanced array processing on dense arrays to detect/localize microseismic events buried in noise (https://resolve.osug.fr/).
– Ultrafast imaging of transient deformation in 3D gels, with applications to high-resolution imaging of rupture dynamics of the friction surface.
– Metamaterial physics at the mesoscopic scale with laboratory & geophysics experiments (https://metaforet.osug.fr/).
– Ultrasonic experiments in fish schools in the multiple scattering regime : evaluation and monitoring of the biomass in lakes and aquaculture cages (https://echofish.osug.fr/).

Summary of Research Activity – 2017-2022

I like to describe my research career as a series of fundamental encounters that have strongly influenced my thematic inflections since my doctorate. Three high level researchers were key persons in my career : Mathias Fink in Paris, W.A. Kuperman in San Diego and Michel Campillo in Grenoble. These three internationally renowned researchers are the best in the field of ultrasound for Mr. Fink, underwater acoustics for W.A. Kuperman and seismology for Mr. Campillo. My scientific career is situated at the interface between these three fields for which the propagation of acoustic and/or elastic waves is a privileged means of study. I owe a lot to these three people, at the scientific and human level, and I hope to have contributed to amplify their work by opening roads for future young researchers interested in wave physics.

If I had to characterize in two words these different roads that I have taken and sometimes cleared, I would say that they are related to (1) the study of the spatio-temporal coherence of ambient noise in acoustics and seismology, (2) the use of dense networks of sensors in geophysics and (3) the development of laboratory experiments to apprehend the complex physics of the waves by going back and forth between the small and the large scale. It is sometimes by mixing these three aspects of my research that I obtained the most convincing scientific results...

Wave physics is at the interface of several disciplines that are particularly active in the Rhône-Alpes region and more particularly in Grenoble : physics, mechanics, geophysics, signal processing, medicine and biology. Thus, several laboratories in Grenoble have included wave propagation, in solid or fluid media, among their research topics. These include ISTerre for geophysics, LIPhy in the field of life physics, LPM2C in the fundamental study of multiple scattering, LEGI in the field of sound-vorticity interaction, and GIPSA-Lab in signal processing. For more than twenty years, the researchers involved have been able to compare their approaches and results through the succession of interdisciplinary research groups POAN, PRIMA, ONDES, IMCODE, MESOIMAGE, META and COMPLEXE. I consider myself as a child of this multidisciplinary school "à la française" and I consider it my duty to give back to the younger ones by organizing regularly (every odd year) summer schools of the same type since 2011.

Since my return to France (2005), one of the main axes of my work has been to develop the Experimental Acoustics Team within ISTerre. The specificity and originality of the laboratory is to work with a multi-scale experimental platform with a multidisciplinary vocation on which several laboratories in the field of wave physics can rely.

This research work is based on my scientific background in ultrasonic acoustics and on several years of experience in a large American university (UCSD, California). Indeed, during my second stay in San Diego (Jan. 2002-July 2005), I had created and developed an ultrasonic laboratory in which we experimented on a reduced scale the acoustic propagation phenomena observed in the ocean. By controlling all the parameters of the environment (wave, number and depth of sources/receivers, temperature or density fluctuations, depth of the waveguide), this tool allowed us to make methodological progress in the field of ocean tomography, target detection in shallow water, underwater communication,... I reproduced this ultrasound platform in Grenoble as soon as I arrived and my goal was to extend its field of investigation to geophysics and more generally to the propagation of acousto-elastic waves in complex media. Thus, a model of the earth's crust can be reproduced at the laboratory scale to study the conversion of energy generated by oceanic microseisms into Rayleigh waves on the continent. Similarly, acoustic propagation in the multiple scattering regime in bubble clouds provides a mesoscopic (and therefore easy to manipulate) account of wave phenomena observed at the crystalline scale.

Based on this experimental platform, two keywords are at the basis of my research work : (1) multi-scale approaches and (2) dense multi-sensor networks.

– (1) A complex medium for waves is any medium for which the propagation is dominated by refraction, dispersion, scattering and/or reverberation phenomena. To approach a complex wave phenomenon simultaneously at the real scale and at the laboratory scale allows to simplify or even to control this complexity by playing separately on different parameters. Thus, using the example of ocean tomography, an underwater acoustic channel is transformed into a waveguide at the ultrasonic scale, a waveguide in which one can control the height of the waves which play an important role in the randomness of the acoustic propagation.

– (2) At the real scale as well as at the laboratory scale, there is no longer any technological limitation to the use of source/receiver arrays in the study of wave phenomena in acoustics and elasticity. For example, the LAUM (Le Mans) is now equipped with a 3D laser vibrometer combined with a mechanized robot that can record the three components of the elastic field at any point on the surface of mechanical parts of any shape and volume. Similarly, geophysicists are no longer afraid to install several thousand seismic sensors on particular geological objects such as faults or volcanoes to better understand the limits of spatial resolution of inversion processes.

However, the use of multi-element arrays is a double-edged sword : on the one hand, it multiplies the angles of view on wave propagation and thus improves the resolution, as has been demonstrated regularly since Shapiro et al (2005) in passive seismic tomography ; on the other hand, it enormously increases the amount of information to be recorded, processed and exploited, at the risk of losing sight of the different physical phenomena that affect wave propagation. For waves in a complex environment (which can be observed in the magma chamber of a volcano or in the heart of a dense school of fish in the sea), I believe we have entered an era where the data as a whole is of better quality than the physical or numerical understanding we have of the mechanisms at play. Even if the emergence of artificial intelligence in the field of waves seems attractive and in any case inevitable, I am not sure that supervised learning techniques (Deep Learning, Machine Learning or others) have the answer to everything...

In practice, by combining multi-scale approaches and dense sensor networks, one way forward is to simplify the complexity of natural environments (land, sea) while maintaining the spatial resolution necessary for imaging and/or monitoring complex wave phenomena. The ultimate goal is to use waves to better characterize a natural environment, to appreciate its complexity and model it, to describe it for imaging or monitoring purposes in geophysics, acoustics or fundamental physics.

To carry out multi-scale and multi-element experiments in the field and in the laboratory, I have equipped the Experimental Acoustics Team at ISTerre with several acquisition electronics and associated source/receiver sensors. These tools allow the study of wave physics phenomena over six frequency decades ranging from Hz to MHz. For example, the latest acquisition (Sept. 2014) is an ultrafast ultrasound scanner that performs real-time channel formation and dynamic acquisition for the study of transient deformations of a gel under frictional stress.

Using these systems, (for more description, see the movies at the bottom of the web page https://www.isterre.fr/annuaire/member-web-pages/philippe-roux/article/description-of-acoustic-experimental-facilities.html), my group multiplies multi-scale approaches and the use of transducer arrays to understand acoustic and elastic wave propagation in geophysics, underwater acoustics (Fig. 1) and in ultrasonic regimes mixing multiple scattering, sound-vorticity interaction or transient deformations.

Fig. 1 : Ultrasonic scale experimental setup to reproduce the physics of a complex ocean waveguide (left). The scaling ratios between the wavelength, the propagation distance R and the depth of the waveguide D respect the full-scale experimental conditions.

In addition, ISTerre has structured during the last five years a part of its engineers/technicians in service and one of them, the Service for Geophysical Instrumentation (SIG), gathers 7 ITA who organize and manage with the researchers the large scale field experiments. For example, I benefited from this service to organize a geophysical experiment in Oct. 2016 with the use of more than 1000 geophones and 150 seismic sources in the framework of the ANR METAFORET. Similarly, the RESOLVE experiment allowed me to install 100 geophones on the Argentiere glacier at 2500 m altitude in April 2018, with a whole set of independent measurements obtained by GPS, subglacial pressure sensor or electromagnetic radar. In the next 5 years, the geophysical equipment deployed by the laboratory (and shared at the Grenoble Observatory level) will be considerably expanded with the addition of 400 geophones funded by an ERC Consolidator (PI Florent Brenguier, 2018).

ISTerre's asset as an internationally recognized laboratory in earth sciences (Grenoble Alpes University is ranked 4th in Geochemistry/Geophysics in the latest CWUR 2018-1019 ranking) and my specific scientific contribution to this renown thus reside in these multiscale approaches that allow to isolate and study in the laboratory particular physical mechanisms and to verify in the field by measurement and observation the combination of all physical processes involved.

In the rest of this activity report, I will describe some applications of wave physics in complex environments through small and large scale experiments and the use of dense sensor networks. My research project will allow to complete the gaps of this report, which does not pretend to be exhaustive, by insisting on the last experimental achievements and the ongoing projects.

1- Correlation of ambient seismic noise : a new method for imaging and monitoring the earth.

The best example of the interdisciplinarity at the heart of my research topics is the current dynamism around the theme of passive imaging in geophysics, underwater acoustics and ultrasound. The craze around the use of ambient noise in wave physics has led Michel Campillo and myself to co-lead four one-week workshops in Cargese in 2011, 2013, 2015 and 2017 : "Passive Imaging and Monitoring in Wave Physics : from Seismology to Ultrasound". A fifth edition will take place in September 2019, this time organized by the new wave of young geophysicists/seismologists of the laboratory.

Broadly speaking, passive tomography boils down to the following dual problem :
1) Can we extract from the ambient noise measured at two points the Green's function between these two points, this Green's function including both surface and volume waves encountered in seismology, for example ?
2) Is the quality of the Green's function extracted from the ambient acoustic or seismic noise sufficient to reconstruct an image of the medium ?

In recent years, experiments have validated the first point in all fields of wave physics. The Green's function emerges from the correlation of a diffuse field measured at two points over long periods of time. The diffuse field is derived from ambient noise as in geophysics [Campillo and Roux, 2014] and underwater acoustics [Fried et al, 2008 ; Leroy et al, 2012 ; Lani et al, 2013]) or from codas of active sources in the multiple scattering regime as in geophysics [Campillo and Paul, 2003 ; Froment et al, 2010] and ultrasonic acoustics [Lobkis and Weaver, 2001 ; Derode et al, 2003 ; Larose et al, 2008].

However, in most cases, only an estimate of the Green's function is obtained, an estimate that depends mainly on the spatial and temporal distribution of the noise sources used. For example, in geophysics, the Rayleigh wave (surface wave) is easily obtained because this wave is largely excited by ambient "ocean" type noise sources in the frequency range [0.1-0.5 Hz]. In underwater acoustics, the Green's function is amplitude-weighted by the fact that the noise sources are mainly present at the ocean surface (wave-related bubble clouds and ship noise). Many theoretical works have studied the problem in free space, in a waveguide or in a cavity [Snieder, 2004 ; Roux et al, 2005 ; Colombi et al, 2014]. The variance of the correlation function and its convergence to the Green's function have been studied theoretically and experimentally. Finally, since ambient noise is often difficult to control, the problem has also been approached using a distribution of incoherent and uncontrolled sources, such as the noise of a ship along its trajectory at sea or the coda of a collection of earthquakes in geophysics [Roux et al, 2004 ; Chaput et al, 2016].

Regarding the second point mentioned above, there is of course still much to do and understand in the field of passive tomography. In particular, reconstructing an image of the medium from the simple ambient noise is an exciting but still open problem. The first surface wave velocity map was obtained in Southern California in early 2005 from Rayleigh waves [Shapiro et al, 2005]. More recently (2009), the San Andreas Fault was mapped in 3D in the Parkfield area (California) via Love wave extraction from ambient seismic noise (Fig. 2a). Even more recent images of the San Jacinto fault (2019) provide even more detail on the "yarrow" structure of the damaged zone from a dense network of about 1100 surface sensors (Fig. 2b).

Fig. 2 : (Left) San Andreas Fault (SAF, California) : 3D image by ambient seismic noise correlation (Roux, 2009). (Right) San Jacinto Fault (California) : Iso-velocity representation (Vs=850 m/s) showing compaction of the fractured zone into several vertical sheets over the first few hundred meters of depth. The fault trace is shown on the surface by the purple solid line (Mordret et al, 2019).

These very encouraging results show that we can achieve a super-resolution goal in geophysical imaging at local (<20 km, Roux et al, 2011) and global ( 1000 km, Boue et al, 2014) scales via surface waves (Rayleigh or Love). In both cases, the tomographic inversion is done from measured travel times between seismometers using a ray tracing based inversion kernel. Contrary to a classical tomography where the time measurement comes from controlled active sources, the passive tomography is the result of the correlation of ambient noise which is expected to satisfy conditions of stationarity and isotropy in the considered spectral band. The quality or bias observed in the tomographic inversion of "ambient noise" is thus directly related to the spatial and temporal properties of the seismic noise and the surface coverage of the sensor network.

In recent years, two major advances have been made in the still very active field of passive seismic tomography. On the one hand, the development of dense sensor networks has become the norm in earth science, both at small and large scales (Roux et al, 2016). For example, we exploited the core part of the US USArray network (400 seismic sensors) and an antenna processing adapted to the ambient seismic noise (Fig. 3) to produce a surface wave phase velocity map with a spatial resolution never before achieved (Boue et al, 2014). Thus, it is indeed via dense arrays and modern beamforming methods that we will continue to improve spatial resolution in passive seismic tomography.

Fig. 3 : (Left) Selection of seismic stations from the "Transportable Array (USArray)" over the period Nov. 2009 - Jan. 2010. Two sub-arrays (blue) organized around each station (red) are used to extract surface waves (Love + Rayleigh) from antenna processing. The white rectangle corresponds to the area over which the high resolution seismic inversion is produced. (Center) Illustration of the Dual Channel Formation (DBF) process between two sub-arrays of 9 stations. Slowness vectors (UA and UB) are associated with azimuthal rotation angles (A and B) to optimize the extraction of surface waves from the ambient seismic noise. (Right) Phase velocity map obtained by inversion of propagation times after DBF. Low velocity areas correspond to sedimentary basins. Those with higher velocities to mountainous massifs (Boue et al, 2014).

On the other hand, seismic tomography can also be enriched by the use of sensitivity kernels based on a finite frequency diffraction approach that goes beyond, in terms of spatial resolution, the classical use of ray tracings. Applied on dense arrays at smaller scales ( some km), sensitivity kernels for surface waves (Fig. 4) allow us to revisit seismic tomography for major applications in oil exploration (Chmiel et al, 2018).

Another potential application of ambient noise via acquisition on dense seismic arrays is the dynamic localization of ambient noise sources. Take for example the noise generated by a geyser a few meters below the ground surface : Old Faithfull, in the heart of Yellowstone National Park, so named for the regularity of its eruptions (with a period of about 40 minutes).

Fig. 4 : Experimental diffraction kernels for surface waves obtained by correlation at F=4.2 Hz for two receivers (stars) separated by (a) 870 m, (b) 1443 m, (c) 2100 m and (d) 2737 m. The diffraction kernels reveal the smallest variations of the wave field velocity. Acquisition here is performed by the oil company CGG from an ultra-dense seismic network ( 50000 geophones) with a measurement point every x=y=30 m (Chmiel et al, 2018).

In 1992, a seismic network of 96 stations had been deployed around the geyser (Fig. 5) to measure its seismic activity. The recorded signals showed a permanent tremor activity, i.e. a continuous intense noise whose amplitude modulation corresponded to the eruption periods of the geyser. By revisiting these ambient seismic noise data, twenty years later, via the use of antenna processing algorithms (or Matched Field Processing, which is similar to a correlation process over short time windows), we were able to isolate and relocate the main sources of seismic noise and their temporal dynamics during the eruption cycle (Cros et al, 2012 ; Vandemeulebrouck et al, 2013). It appears (1) that the dominant source of noise comes from the geyser conduit with a progressive rise of this boiling noise during the cycle (Figs. 5c and d), and (2) that a recharge zone is present next to the geyser as is sometimes described in the literature (Fig. 5b) for this type of hydrothermal phenomena.

Fig. 5 : Temporal monitoring of ambient seismic noise sources at Old Faithfull Geyser, Yellowstone National Park, USA. (a) Geographical distribution of the 96 seismic stations around the main geyser conduit over a 40 m x 40 m area. (b) Model of the structure of a bubble trap geyser. (c) Spatial distribution of seismic noise sources during two cycles of the geyser. Sources in the main conduit are in blue, sources in the recharge zone are in red. An angle of 20 degrees is observed with respect to the vertical for the main conduit. (d) Dynamic monitoring (at depth on this plot) of ambient seismic noise sources. Note : (1) the progressive rise at the beginning of the cycle to a depth of about 10 m and (2) the activation of the recharge zone at the end of the eruption cycle (Vandemeulebrouck et al, 2013).

2- Ultrasonic acoustics : waveguide tomography via dual antenna processing.

What is it like to use dense arrays at the laboratory scale ? What scientific progress can be made in the field of wave propagation ?

The combined use of a transmitter antenna and an acoustic receiver antenna on either side of a waveguide allows the separation of the different arrivals specific to propagation in a reverberant environment via the Double Beamforming (DBF) antenna processing described above. By transforming the received data from position space to angle space (as shown in Fig. 6 for vertical linear antennas of piezoelectric elements that cover the entire water column in an ultrasonic waveguide of 5 cm depth and 1. 2 m in length), each of the wavefield intensity maxima after DBF is allowed to be identified with acoustic paths (or acoustic ray) propagating between the two antennas (Roux et al, 2008 ; Le Touze et al, 2010).

Fig. 6 : (Left) Schematic representation of the ultrasonic waveguide materialized by the two red interfaces and the acoustic rays connecting the center of the transmitting array (left) to the center of the receiving array (right). (Right) Representation of the intensity maxima (experimental data at 1 MHz) in 3D space [transmit angle, receive angle, time] of each acoustic beam after DBF. Each "beam" is numbered according to the total number of reflections on the interfaces, with the + or - sign corresponding to a first reflection on the bottom or surface of the waveguide (Le Touze et al., 2010).

The advantage of these multiple acoustic rays traced between each transmitter-receiver sub-antenna (formed of about ten piezoelectric elements) is that they cross the waveguide along the x and y axes (length and depth), providing for each of them information in time, amplitude and angle on each of the acoustic "pixels" crossed. In practice, more than 2000 rays are identifiable in the experimental configuration of Figure 6 and one can imagine performing a tomographic inversion in the waveguide associated with a local density or velocity perturbation based on all these acoustic rays. In practice, we have sought to combine DBF with the physics of sensitivity kernels to relate the variations in time, amplitude or angles of each "beam" (or acoustic beam) to the physical parameters of the fluctuation : local change in density (a target in the water), local perturbation in velocity (a temperature plume rising from the bottom of the waveguide) or local change in the water-air interface (a wave at the surface).

Unlike acoustic beams (geometric or high frequency approximation), sensitivity kernels applied to acoustic beams allow to integrate diffraction effects related to the limited bandwidth of piezoelectric transducers (Fig. 7). This physics is not new and was first developed in the context of near-surface geophysical imaging (Dalhen et al, 2000), but its generalization to amplitude/time/angle observables specific to acoustics in reverberant media (waveguide) is a novelty (Marandet et al, 2011 ; Aulanier et al, 2013).

Fig. 7 : Representation of the sensitivity kernel of the amplitude of an acoustic beam at 3 MHz for a path with one reflection at the surface and one at the bottom of the waveguide. Longitudinal (a) and transverse (b) sections in the propagation plane for transceiver antennas consisting of 3 elements. (c) and (d) Same for two transceiver antennas with 21 elements (Marandet et al, 2011)

This work led us to perform three types of inversion in ultrasonic waveguides :

(1) detection/localization of a wavelength-sized target in a harbor-like environment (Marandet et al, 2011), as depicted in Fig. 8,
(2) the imaging of a heat plume (Roux et al, 2011), observed during the rise of a convective plume from the bottom of the waveguide (Fig. 9).
(3) the inversion of a local waveguide surface disturbance (Roux and Barbara, 2014) due to the passage of a wave on the waveguide surface (Fig. 10).

Fig. 8 : (Left) Schematic representation of the waveguide with characteristic lengths. (Right) Detection and localization of a spherical lead target of diameter a for a product ka 20 (wavelength 0.5 mm) in an ultrasonic waveguide of length 1100 mm and depth 52 mm, bounded by two transceiver transducer antennas that span the entire height of the guide. The color scale represents the probability of target presence (Marandet et al, 2011) when the ball is in the center of the guide.

All this work was carried out in close collaboration with the GIPSA-Lab (INP, Grenoble) in the framework of the ANR Jeune Chercheur TOTS (2010-2013), led by Barbara Nicolas. Two thesis grants financed by the Direction Général de l'Armement (DGA) allowed us to train students on these physical problems linking ultrasonic acoustics and signal processing.

Fig. 9 : (Left) Schematic representation of the waveguide with characteristic lengths. (Right) Tomographic inversion from acoustic beam times for a thermal convection plume initiated at the base of the ultrasonic waveguide (red dot). At 8.5s after convection initiation, the rise of the plume from the bottom of the waveguide to the surface is clearly observed (Roux et al, 2011).

Fig. 10 : (Left) Schematic representation of the waveguide with the characteristic lengths. Note that the surface wave velocity (V 0.4 m/s) is very small compared to the ultrasonic wave velocity in water (c 1500 m/s). (Right) Spatio-temporal representation of the surface deformation during the propagation of a wave through the transceiver plane. The x-axis corresponds to the distance between the transceiver antennas. Each panel corresponds to the waveguide surface inversion produced from one of the 500 acoustic acquisitions made in the waveguide. The inversions are produced from the amplitude variations of the acoustic "beams" under the influence of the deformation of the waveguide surface (Roux and Barbara, JASA, 2014).

For the DGA, the purpose of this research work is to develop a methodological approach based on transceiver antennas that allows the inversion of a disturbance of any size and characteristic in underwater acoustic channels. In practice, the military issue is in the field of port protection with the detection/location of divers or mini submarines (Automated Underwater Vehicle, AUV).

For national security, the question is : how to protect the harbours of Brest or Toulon against terrorist attacks when all the classical sonar systems see their efficiency strongly decreased in reverberating environments for acoustic waves ?

The latest developments on this research theme relate to the nature of the observables used for the inversion of a disturbance in the waveguide. Indeed, if the time and amplitude variations of the acoustic beams have been used until now thanks to the sensitivity kernels (Figs. 8-10), the variation of the emission and reception angles of each of these beams had not been exploited yet. This is now done for a disturbance generated on the surface of the waveguide by a laser shock and the inversion result is very spectacular (Fig. 11).

Fig. 11 : (Left) Schematic representation of the waveguide with the laser shot impact at the center of it (red arrow). (Right) Result of the waveguide surface inversion using both transmit and receive angles of a collection of 2285 acoustic beams. The x-axis is the length of the waveguide ; the y-axis is the time relative to the laser shot generating the gravitocapillary surface wave. The color scale corresponds to the deformation of the surface in meters.

Surprisingly, we find that the inversion of the surface disturbance is much cleaner (less ghosting, better spatial resolution) with the use of angle variables instead of time or amplitude variables. This observation leads to interesting and fundamental conclusions in the field of acoustic tomography. Indeed, tomography has always been interested in the travel time (or the variation of the travel time) of a wave to obtain the velocity map (or its fluctuations) of the propagation medium. To obtain a good time measurement, a perfect synchronization between the source and the receiver is required. What is easy at the ultrasonic scale in the laboratory becomes very complex and expensive to implement in the ocean where several thousands of kilometers separate transmitters and receivers in the rare attempts at acoustic tomography at this scale (see more general info on the wikipedia site https://en.wikipedia.org/wiki/Ocean_acoustic_tomography). To show, as in Figure 11, that the same tomography can be obtained by varying the angle of the acoustic rays rather than their travel time means that only the local synchronization of each element of the transmitter/receiver antennas is required and not the complete synchronization between the two antennas.

Undoubtedly, this major paradigm shift will lead in the future to new large-scale tomographic experiments with the objective of accurately measuring spatial and temporal variations in the temperature of the surface layers of the ocean, which are indicators of ongoing climate change. It should be noted that the transposition to the real scale of an oceanic waveguide of these experimental results performed at the ultrasonic scale was already the subject of a publication (Roux et al, 2013).

My work in underwater acoustics was awarded in 2013 with the "Medwin Prize in Acoustical Oceanography" by the Acoustical Society of America.

3- Sub-wavelength resonant metamaterials : an original experimental approach conducted at the laboratory and geophysical scales.

This work concerns the experimental and numerical study of the effect of sub-wavelength uniaxial resonators on the propagation of elastic bending waves in a thin aluminum plate (Lamb A0 mode). The resonators consist of simple aluminum rods glued to the plate (see Fig. 12 for the description and evolution of the experimental setup). They derive their sub-wavelength character from the important ratio between their dimensions (length/diameter) reaching almost two decades. When we arrange them (periodically or not) on a sub-wavelength scale, we obtain a locally resonant medium which behaves like a metamaterial. In the two experimental configurations of Fig. 12, the degrees of freedom that this metamaterial offers on the control of the wave field, are large. On the one hand, the propagation medium is a plate which, in the frequency range studied, has two components : longitudinal (Lamb mode S0) and transverse (Lamb mode A0). On the other hand, the resonators present both bending resonances (related to the S0 component in the plate) and compression resonances (excited by the Lamb A0 mode). The metamaterial consists of 100 to 400 rods that can be spatially organized in an ordered or disordered manner.

Fig. 12 : (Left) Experimental setup for the first metamaterial experiments in the laboratory from 2013. A vibrometer (1) generates a Lamb A0 wave in the aluminum plate. The wave field is measured by a Doppler velocimeter (2) whose measurement point is moved on the top side of the plate to each point of the rectangular surface (5) and controlled by a PC and a set of two motorized mirrors. The metamaterial (6) is attached to the bottom side of it (Rupin et al, 2014 & 2015). (Right) Evolution of the experimental setup from 2018. The source is a piezoelectric element (a) glued to the plate. The Doppler velocimeter (c) is now connected to a motorized robot arm (e) controlled by PC (d), allowing for a larger analysis area (Lott and Roux, 2019a). In both experimental setups, the metamaterial (a) consists of 100-400 vertical aluminum rods that are glued to the underside of the plate (g). The recorded signal (b) is highly dispersed due to the low intrinsic attenuation of the plate. The temporal dispersion in response to a short pulse exceeds 0.2s, which corresponds to more than 20 round trips in the plate.

The originality of the experiment, in addition to its mesoscopic dimension which is quite unusual in the field of metamaterials, lies in the mapping of the wave field over a large area including the metamaterial, thanks to the sequential acquisition of all the pulse responses, using a laser velocimeter (Fig. 12). Analysis of the data reveals the presence of three broad frequency band gaps, which begin at the location of the compressional resonances of each rod (Fig. 13b & Fig. 14). We tested an arrangement, both periodic and random, of the resonators and the results are quite identical. The band gaps are thus related to the resonant nature of the elementary cell of the metamaterial, and not to its periodic character (Bragg diffraction). On the other hand, we have also highlighted apparent velocities lower or higher than those measured in the bare plate for the frequencies located at the edge of the band gap (Fig. 14).

Fig. 13 : Spatial representation of the normal field velocity measured experimentally on the plate (rectangular area delimited on Fig. 9). The area covered by the metamaterial (formed by 10 x 10 vertical rods) is placed on the left between 0 and 0.2 m. The wavefield for the A0 mode is presented at three frequencies : (top) just before a band gap, (middle) within a band gap, (bottom) just after a band gap. Before and after the band gap, the apparent velocities (measured from the wavelengths extracted from the speckle pattern within the metamaterial) are slower or faster than in the bare plate (Williams et al, 2015).

A global view of all these interference phenomena is obtained via the determination of the dispersion relation within the metamaterial (Fig. 14). We then find a deep modification of the dispersion curve of the A0 mode, with band gaps (or propagative bands) that are the result of repulsion effects (called "hybridizations") linked essentially to compressional resonances. We also show that Bloch's theorem allows for excellent modeling of the dispersion relation in all its complexity (Williams et al, 2015).

Fig. 14 : Comparison between the experimental and theoretical dispersion relations within the metamaterial. (a) The wave number corresponding to the propagative part of the field is in black, with the dispersion relation resulting from a numerical calculation (red). Two hybridizations (with the binding and the anti-binding branches on both sides of the resonance) are clearly distinguished, each opening a band gap. (b) The measured attenuation within the metamaterial in the band gaps is shown in black, to be compared with the numerical prediction (red). The agreement between experimental and numerical results is excellent (Williams et al, 2015).

In another aspect of this work, we used numerical finite element modeling, via the numerical code SpecFem3D, to better understand the complexity of this elastic metamaterial. We first showed that wave propagation in this type of metamaterial can be approximated by a 1D system (support beam + resonators), which is less expensive in terms of computational resources. We were then able to look at the hybridizations induced by each of the 2 types of rod resonances, bending and compression, independently of each other (Colquitt et al, 2017). This allowed us to establish the singular character of elastic metamaterials. Indeed, the bending resonances of the rods result in an energy transfer between the transverse component of the wave field in the plate (A0) (which is the only one initially excited) and the longitudinal component (S0).

From the point of view of the dispersion relation, this results in a particular hybridization, which makes a third propagation mode appear. This hybridization accounts for the coupling between the A0 and S0 modes in the plate due to the bending resonances. It is all the more apparent as the plate is thin (and therefore flexible), and is manifested on Figure 15 by the appearance of transmission bands or very narrow band gaps associated with the bending resonances (Lott & Roux, 2019b).

Fig. 15 : Influence of the plate stiffness on the coupling between the rods and the plate at bending resonances. (a) Dispersion curve obtained experimentally with h = 6 mm wide plate. (b) As for (a), with a plate of h = 2 mm width on a restricted part of the frequency spectrum (red dashed square in (a)). For the thinner plate, the plate plus rod system shows stronger interaction with the rod bending resonances (blue dots), both inside and outside the band gap.

In conclusion, the dispersion relation obtained in these locally elastic resonant media is dominated by hybridization effects due to the rod compressional resonances within the metamaterial. However, hybridization on the longitudinal component of the field is also at work, due to the bending resonances. Finally, we were able to test a number of 1D configurations (support beam + sub-wavelength resonators), which showed the great richness of possible configurations with this beam + rods assembly. In particular, we have observed that a stiffening of the plate (Fig. 15), obtained by increasing its thickness, leads to less and less marked hybridization effects for the bending resonances. The influence of the inter-resonator spacing shows the possibility of obtaining negative group velocities, linked to hybridization by the bending resonances. This confirms the interest of this type of metamaterials for applications such as invisibility cloaks.

Currently, we are looking to obtain this type of cloaking for Lamb waves. We have initiated the development of an algorithm based on the minimization (in the sense of least squares) of the difference between the wave field observed in the bare plate (without obstacle or metamaterial) and the one observed when an obstacle surrounded by the metamaterial is added. The parameters used for the minimization are the length of the rods and their spacing. The general arrangement of the resonators follows that used recently with this same type of waves by Farhat et al. (2009). An example of a configuration with resonators of different lengths, is given in Figure 16. It shows that it is possible to obtain a slowing down or an acceleration of the Lamb A0 waves according to the bandwidth that we select. We notice that the forward diffraction pattern is less marked in the case where the waves travel faster in the metamaterial. Here, obtaining a true "cloaking" effect requires obtaining an effective anisotropy on the propagation velocity of the Lamb A0 wave (Colombi et al, 2015, 2016a).

Fig. 16 : Illustration of the work in progress for the development of an invisibility cloak for Lamb A0 waves. (a) Example of the configuration studied : a set of rods of different lengths are arranged in a star shape. (b) and (c) Allure of the wave field (vertical component) within the metamaterial (materialized by the yellow circles) in two different frequency ranges. The slowing down (left) or the acceleration (right) of the waves is obvious, the latter giving rise to a better reconstruction of the diffracted field towards the front.

The generalization of these physical phenomena to the geophysical scale, where the plate then becomes a ground that can be modeled as a semi-infinite medium, would then show that Rayleigh waves (surface waves) undergo the same effect when interacting with a forest consisting of trees 20 m tall and spaced every 3 or 4 m (Colombi et al, 2016a), opening new possibilities in the field of seismic protection (Fig. 17).

This is the goal of the METAFORET project (https://metaforet.osug.fr/), which was funded by ANR "Défi de tous les savoirs" in 2016. Indeed, the observation that was at the origin of the METAFORET project is the following : why does wave physics present few large-scale complex physics experiments ? Since waves generally obey the same propagation equation, why do we rarely observe wave physics phenomena on the geophysical scale, for example ? Of course, what seems easy in a controlled environment at the laboratory scale can be very difficult to implement at large scales where it is sometimes impossible to deploy a large number of autonomous sensors.

Fig. 17 : Examples of locally resonant metamaterials at different scales for seismo-elastic waves. (a) Seismic deployment of 1000 geophones (yellow dot) on the side of Mimizan (Landes) at the interface between an open field and a dense pine forest. (b) Laboratory-scale surface covered by a random arrangement of vertical metal rods glued to a thin aluminum plate. (c) Mechanical similarities of the unit resonant cell for both systems, with their respective frequency bands (Lott et al, 2019).

In recent years, however, the earth sciences, and geophysics in particular, have been undergoing a technological revolution with the multiplication of acquisitions on very dense seismometer networks, sometimes including more than ten thousand sensors. Until recently, these seismic campaigns were the prerogative of rich oil companies. But things are changing and the financial cost of these acquisitions is now becoming affordable for academic research. Looking ahead, we are even close to a critical point where the excellence of the geophysical data will exceed our understanding of the underlying physical phenomena.

Figure 18 : Top : META-FORET experiment setup (Oct. 2016). The objective was to install 961 three-component geophones on a 120 m × 120 m grid with 4 m spacing between elements. The seismic array (red) is placed at the interface of an open field and a dense pine forest (80 trees per 400 m²). Bottom left : Continuous recording of ambient noise was made over 12 days with FairFieldNodal wireless seismic sensors. Bottom right : In addition to this ambient noise, active source signals were recorded with a vibrometer placed at different locations (top : blue ellipses) in the open field (inside and outside the array) and in the forest.

The METAFORET project aims to fill this gap with a multidisciplinary approach proposed by a team of physicists, geophysicists and engineers who share a common interest in wave propagation in complex media. The goal of the project is to reconcile complex wave physics with large-scale observations.

Specifically, we aim to perform experiments on metamaterial physics in two geophysical-specific configurations (Fig. 18). In the first, we have shown that a natural forest behaves as a metamaterial for seismic waves (Roux et al, 2017). The idea is that each tree in the forest acts as a resonator that traps a small portion of the seismic surface waves. The collective behavior of the trees would then correspond to that observed at the very small scale (millimeter) in optical metamaterials. In the second experimental configuration (to come in 2020), we will show that a particular spatial distribution of buried concrete columns, classically used in civil engineering for soil compaction, can also behave as a seismic lens for surface waves, with the effect of refracting the waves around the center of the lens leaving this area free of any seismic vibration.

In parallel with 3D numerical simulations (Colombi et al, 2016b, 2016c, 2017) and a theoretical approach based on conformational geometry (Farhat et al, 2009), the primary goal of the META-FORET project is thus to carry out two ambitious and innovative experiments where 1000 seismic sensors deployed over an area of about one hectare will have the purpose of measuring the seismic wave field in the two geophysical metamaterials proposed above. This high spatial density of sensors is mandatory to accurately measure the dispersion curves (and thus the surface wave velocity) inside and outside the metamaterial.

Fig. 19 : METAFORET 2016 experiment. (a)-(d) Spatial representation (x-y) of the seismic wavefield measured on the seismic array (vertical component) for a source inside the forest in position (x=60 m, y=30 m) and displayed at four different times from time t=0 of the seismic shot (from left to right) (a) t=0.09 s ; (b) t=0.12 s ; (c) t=0.15 s ; (a) t=0.18 s. The seismic wave field was filtered in the 20 Hz-50 Hz band. In each image, the horizontal red line represents the forest-field boundary. (e)-(f) Same representation as above for the seismic field filtered in the 50 Hz-80 Hz frequency band. The low frequency part of the wavefield (<50 Hz) shows a spatially coherent surface wave of large amplitude while the high frequency part (>50 Hz) has a much smaller amplitude (see the different color bars in the upper and lower panels) and shows a very reduced spatial coherence.

In practice, two types of source were used during the 2016 experiment : (1) ambient seismic noise, probably of anthropogenic origin at the frequencies considered (>10 Hz) and (2) a source signal controlled and transmitted to the ground by a vibrating pot (Fig. 18). The analysis of the wave dispersion within the two metamaterials (a natural forest or a soil compaction site with buried columns) will allow us to consider potential applications to high frequency seismic cloaking in civil engineering (Fig. 19).

I am convinced that this project has important applications in geophysics and civil engineering in the longer term. For example, the cloaking frequency bands could be exploited to reduce ambient seismic noise at locations where ground vibrations may be a problem for the quality of high-precision scientific measurements (local vibrations of large astronomical antennas).

Main references

F. Aulanier, B. Nicolas, P. Roux, and J. Mars (2013), “Time-angle sensitivity kernels for sound-speed perturbations in a shallow ocean”, Journal of the Acoustic Society of America, 134(1), 88-96.

P. Boue, P. Roux, M. Campillo and X. Briand (2014), “Phase velocity tomography of surface waves using ambient noise cross-correlation and array processing”, Journal of Geophysical Research, 119, 519-529.

M. Campillo and A. Paul (2003), “Long-range correlations in the diffuse seismic coda”, Science, 299, 547-549.

M. Campillo and P. Roux (2014), “Seismic imaging and monitoring with ambient noise correlations”, Treatise on Geophysics, second Edition, Vol. 1, Edited by B. Romanowicz and A. Dziewonski, Elsevier-Amsterdam, 256-271.

J. Chaput, V. Clerc, M. Campillo, P. Roux and H. Knox (2016) , “On the practical convergence of coda-based correlations : A window optimization approach”, Geophysical Journal International 204 (2), 704-715.

M. Chmiel, P. Roux, P. Herrmann, B. Rondeleux, M. Wathelet (2018), “Data-based diffraction kernels for surface waves from convolution and correlation processes through active seismic interferometry”, Geophysical Journal International, 214 (2),1468–1480.

A. Colombi, L. Boschi, P. Roux, and M. Campillo (2014), « Green's function retrieval through cross-correlations in a two-dimensional complex reverberating medium”, Journal of the Acoustic Society of America, 135 (3), 1034-1043.

A. Colombi, P. Roux, S. Guenneau, and M. Rupin (2015), « Directional cloaking of flexural waves in a plate with a locally resonant metamaterial”, The Journal of the Acoustical Society of America 137 (4), 1783-1789.

A. Colombi, P. Roux, S. Guenneau, P. Gueguen, and R. V. Craster (2016a), “Forests as a natural seismic metamaterial : Rayleigh wave bandgaps induced by local resonances”, Scientific Reports 6, 19238.

A. Colombi, D. Colquitt, P. Roux, S. Guenneau, and R. Craster (2016b), “A seismic metamaterial : The resonant metawedge”, Scientific Reports 6, 27717.

A. Colombi, S. Guenneau, P. Roux, and R. Craster (2016c), « Transformation seismology : composite soil lenses for steering surface elastic Rayleigh waves”, Scientific Reports 6, 25320.

A. Colombi, R. Craster, D. Colquitt, S. Guenneau, Y. Achaoui, P. Roux and M. Rupin (2017), « Elastic wave control beyond band-gaps : shaping the flow of waves in plates and half-spaces with subwavelength resonant rods”, Frontiers in Mechanical Engineering, section Mechanics of Materials, doi : 10.3389/fmech.2017.00010.

D. Colquitt, A. Colombi, R. Craster, P. Roux and S. Guénneau (2017), « Seismic metasurfaces : Sub-wavelength resonators and Rayleigh wave interaction”, Journal of the Mechanics and Physics of Solids 99, 379-393.

E. Cros, Ph. Roux, J. Vandemeulebrouck and S. Kedar (2011), "Locating hydrothermal acoustic sources at Old Faithful geyser using Matched-Field processing", Geophys. J. Int., 187(1), 385-393.

A. Derode, E. Larose, M. Tanter, J. De Rosny, A. Tourin, M. Campillo and M. Fink (2003), « Recovering the Green's function from the field-field correlations in an open scattering medium (L) », J. Acoust. Soc. Am., 113, 2973-2976.

F.A. Dahlen, S.H. Hung and G. Nolet (2000), "Fréchet kernels for finite-difference traveltimes – I. Theory", Geophys. J. Int, vol 141, pp.157-174.

M. Farhat, S. Guenneau and S. Enoch (2009), Phys. Rev. Lett., 103, 024301.

S. Fried, K. Sabra, P. Roux, and W. A. Kuperman (2008), “Extracting the local Green's function on a horizontal array from ambient ocean noise”, J. Acoust. Soc. Am., 124 (4), Pages EL183-EL188.

B. Froment, M. Campillo, P. Roux, P. Gouédard, A. Verdel and R. Weaver (2010), “Estimation of the effect of non-isotropically distributed energy on the apparent arrival time in correlations”,
Geophysics, 75 (5), SA85–SA93.

S. W. Lani, K.G. Sabra, W.S. Hodgkiss, W. A. Kuperman and P. Roux (2013), “Coherent processing of shipping noise for ocean monitoring”, JASA Express Letters 133, EL108-113.

E. Larose, P. Roux, M. Campillo and A. Derode (2008), “Fluctuations of correlations and Green function reconstruction : role of scattering”, Journal of Applied Physics 103, 114907.

C. Leroy, S. Lani, K. Sabra, W. Hodgkiss, W. Kuperman, and P. Roux (2012), “Enhancing the emergence rate of coherent wavefronts from ocean ambient noise correlations using spatio-temporal filters”, J. Acoust. Soc. Am., 132 (2), 883-893.

G. Le Touze, B. Nicolas, J. I. Mars, P. Roux and B. Oudompheng (2012), « Double-Capon and Double-MUSICAL for arrival separation and observable estimation in an acoustic waveguide”
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O. I. Lobkis and R. L. Weaver (2001), “On the emergence of the Green's function in the correlations of a diffuse field”, J. Acoust. Soc. Am., 110, 3011-3017.

M. Lott and P. Roux (2019a), “Effective impedance of a locally resonant metasurface”, Phys. Rev. Materials 3, 065202.

M. Lott and P. Roux (2019b), “Locally resonant metamaterials for plate waves : the respective role of compressional versus flexural resonances of a dense forest of vertical rods”, Fundamentals and Applications of Acoustic Metamaterials, Edited by Vicente Romero, ISTE Ltd.

C. Marandet, P. Roux, B. Nicolas and J. Mars (2011), "Target detection and localization in shallow water : an experimental demonstration of the acoustic barrier problem at the laboratory scale", J. Acoust. Soc. Am. 129(1), 85-97.

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P. Roux, L. Moreau, A. Lecointre, G. Hillers, M. Campillo, Y. Ben-Zion, D. Zigone and F. Vernon (2016), “A methodological approach toward high-resolution surface wave imaging of the San Jacinto Fault Zone using ambient-noise recordings at a spatially dense array“, Geophysics Journal International, 206, 980-992.

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Description of Acoustic Experimental Facilities

Philippe ROUX — 2011-07-05T11:59:20Z

A team of physicists arrived at ISTerre in 2005, in order to develop innovative imaging strategies and procedures at the laboratory scale. This team has broad interests, ranging from underwater acoustics (oceanography), non-destructive testing and evaluation, medical imaging and, of course, seismic imaging. The facility includes two large experimental rooms for a total surface of 200 m2.

The Mega-Hertz room is equipped since 2006 with two powerful multi-channel ultrafast ultrasonic acquisition equipments from Lecoeur Electronics. One is a 64-channel acquisition devoted to small-scale ocean experiments, and the other is an 8-channels acquisition with specific source amplification and reception pre-amplification, and is fully devoted to ultrasound probing in concrete.

A newer version of this multi-channel electronics was purchased in July 2014 from Verasonics. This equipment consists in 128-channel electronics with programmable emission that permits ultrafast acquisitions (more than 1000 images per second) with ultrasonic signals in the MHz regime. The pulser amplitude is adjustable between 3 and 190 V peak-to-peak. The signals are received with 14-bit A/D converters with programmable sample rate up to 62.5 MHz. The local buffer memory is 64 Mb/channel which allows long acquisitions to be performed in a burst sequence mode. Digital averaging, filtering and decimation may be performed on data prior to transfer to host computer to improve signal to noise. The data transfer to host computer operates at 6.6 GB/s. Individual channel acquisition data and complex reconstruction data are made available in Matlab workspace for storage and advanced processing.

These multi-channel ultrasonic systems are coupled with a large set of ultrasonic arrays. At present, we have pairs of 64-element arrays (allowing to work in emission / transmission with different source-receiver arrays) centered at 0.5 MHz, 1 MHz, 3 MHz, 5 MHz and 7 MHz. These arrays have a 70 % bandwidth that make them very useful for broadband acquisitions.

The Kilo-Hertz room deals with wave propagation at lower frequencies with :
– A network of 32 mini-accelerometers from Bruel & Kjaer with an excellent sensitivity (>90 dB) in the frequency range from 1 Hz to 20 kHz.
– Two laser vibrometers associated with mirrors and step motors to scan the field normal to a surface with mm accuracy. The frequency range of the vibrometers is 10 Hz-10 kHz.
– A large collection of piezoelectric transducers that can emit and receive the field between 100 Hz and 12 kHz.
– Four 16-channel NI acquisitions card (16 input + 2 output) that can be chained together and connected to a PC through USB port. This NI acquisition device is driven by Matlab.
– Two high-speed synchronized cameras that allow the measurement of the normal displacement (at a maximum speed of 10 images per second) on large surfaces (1 m x 1 m) through a stereo-correlation algorithm.

Kilo-Hertz room
3D view of the Kilo_Hertz room- click on image to start the video -
Mega-Hertz room
3D view of the Mega-Hertz room- click on image to start the video -