Méthodes de corrélation de bruit pour l’imagerie et/ou le monitoring

Fig. 1. High resolution imaging of Southern California using ambient seismic noise (Shapiro et al. Science, 2005)

 

**Context

Since a decade our group has been leading the development of new methods employing diffuse seismic waves such as coda waves (Campillo & Paul, Science, 2003) or ambient seismic noise to gain information about the structure of the Earth (Fig. 1) and about its dynamics in terms of temporal evolution of seismic properties (Fig. 2).

 

 

**Objectives

Our objective is to increase the potential of using noise-type seismic waves to image the Earth’s interiors at different scales (from local to global) and to monitor dynamic processes such as earthquakes preparation and relaxation and volcanic activity. For that purpose we employ high computation power from computational grids and distributed storage.

 

 

Fig. 2a. Detection of seismic velocity drops preceding eruptions at Piton de la Fournaise Volcano (Brenguier et al. Nature, Geosc., 2008).
Fig. 2b. Seismic velocity changes at Parkfield (California) induced by the 2004 Parkfield earthquake (Brenguier et al., Science, 2008).

**Projects :

– Whisper,ERC
– Namazu, ANR

 

 

**Contacts :

– Michel Campillo
– Florent Brenguier
– Eric Larose
– Philippe Roux