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Multidisciplinary Observatory of Slope Instability - OMIV
**Scientific Objectives
Landslides have an important societal impact in many mountainous, hilly and coastal regions throughout the world. Monitoring is an essential to enhancing understanding of the physical processes that control their slop movement (failure, spreading) and to predict their behavior in time and space. Monitoring slope instability thus represents a major scientific and social issue.
The objective of the National Observatory of Slope Instability (OMIV) is to provide long-term records of four categories of landslide components:
- Surface displacements
- Seismological observations
- Meteorological observations
- Hydro-geochemical observations
OMIV monitors four ongoing landslides, representative of the mechanisms present in both hard rocks and soft sediments of the French Alps.
Location of landslides under observation: purple for hard rocks slides, blue for soft sediments slides, greens for rockfalls.
**Organisation
OSUG/ISTerre is in charge of seismological observations for all landslides under observation.
OSUG/ISTerre is in charge of two observational sites: Avignonet and Séchilienne.
***Seismological observations
Each landslide is equipped with 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 catalogs of endogenous events (e.g. rockfalls, earthquakes) in near-real time for the Séchilienne site (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 in Triève, above the Monteynard lake about 30 kilometers south of Grenoble. Clayey deposits, formed by clayey moraines and clay litters, sit atop marno-calcareous substratum. Several sliding surfaces have been identified, the deepest one at around 50 meters deep. |
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Séchilienne
Located in hard rocks
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The Séchilienne landslide is located on the southeastern border of the Belledonne mountains and affects micaschites with subverticale foliation. The most active part contains an estimated volume of 3-5 millions per m3 and represents just one part of the entire movement, which can reach up to 100 millions of m3. This displacement rate varies from a few centimeters to several meters per year. |
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**Useful links
OMIV national website: OMIV
RESIF website: RESIF