La fédération
Intranet
Observatoire multidisciplinaire des instabilités de versants - OMIV
**Scientific Objectives
Landslides have an important societal impact in many mountainous, hilly and coastal regions in the world. Monitoring is essential to learn more on the physical processes controlling their movement (failure, propagation) and to predict their behavior in time and space. Landslide monitoring represents a major scientific and societal issue.
The objective of the National Landslide Observatory – OMIV – is to provide long-term records of four categories of landslide parameters:
- Surface displacements
- Seismological observations
- Meteorological observations
- Hydro-geochemical observations
OMIV monitors four on-going landslides which are representative of the mechanisms involved in the French Alps, in both hard rocks and soft sediments.
Location of the studied landslides: purple for hard rocks slides, blue for soft sediments slides, greens for rockfalls.
**Organisation
OSUG/ISTerre is in charge of the Seismological observations for all the studied landslides.
OSUG/ISTerre is in charge of two observational sites: Avignonet and Séchilienne.
***Seismological observations
Each landslide is instrumented by a network of seismic stations (11 stations in total, with up to 9 channels per station). Continuous data is available in SEED format through RESIF. (RESIF-MT)
We also produce near-real time catalogs of endogenous events (rockfalls, quakes) for the Séchilienne (catalog-SECH) and La Clapière landslides (catalog-CLAP):
***OSUG/ISTerre observational sites
Avignonet
Located in soft clay materials
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The Mas d’Avignonet Landslide is located 30km South of Grenoble, in Triève, above the Monteynard lake. The marno-calcareous substratum is surmounted by clayey deposits, formed by clayey moraines and clays litters. Several sliding surfaces have been identified, the deepest one being around 50m deep. |
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Séchilienne
Located in hard rocks
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The Séchilienne landslide is located on the south-east border of the Belledonne mountains, and affects micaschites with subverticale foliation. The very active part is estimated to a volume of 3 to 5 millions of m3, and only represents a part of an ensemble movement which can reach 100 millions of m3. The displacement rate varies from some centimeters to several meters a year. |
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**Useful links
OMIV national website: OMIV
RESIF website: RESIF