International Federation of Digital Seismograph Networks

MT: Observatory for Multidisciplinary monitoring of Instability of Versant

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FDSN Network Information

FDSN code MT Operated by Observatoire de Grenoble, Grenoble
Network name Observatory for Multidisciplinary monitoring of Instability of Versant (OMIV) Deployment region France
Start date Jan. 1, 2006 End date -
Short description

The Multidisciplinary Observatory of Versant Instabilities, the french national observatory of landslides (SNO-OMIV) monitors four ongoing landslides which are representative of the mechanisms involved in the French Alps (hard/soft rock, slow/fast moving slope). On each site, the SNO-OMIV provides continuous open-access recordings of the landslide kinematics, its seismic response, and the hydro-geochemistry characteristics of the moving slope. These open data sets are a unique opportunity to analyze landsliding patterns through time and to understand the mechanisms that drive the landslide triggering and their dynamics. Slow-moving landslides are also analogues to near-surface fault creep as dominated by aseismic slip. The (OMIV) observatory for landslide was labelled as SNO-INSU-CNRS in 2009 to : - monitor 4 sites in the French Alps (Avignonet, La Clapière, Séchilienne, Super-Sauze) - produce 3 observables for each site : i) The displacement kinematics using tiltmeters, extensometers, GPS sensors, satellite imaging; ii) the landslide seismic patterns: endogenous seismic signals (micro-earthquakes, rockfalls, exotic signals) and landslide response to regional earthquakes; iii) The hydraulic response to weather forcing (hydro-geochemistry measurements) - post-processed data and services - free open access data close to real time The OMIV scientific instrumentation currently in use on the 4 studied sites includes: 10 GPS receivers, 90 tacheometric benchmarks (CEREMA), 7 weather stations, 8 hydrological stations, 39 1-component and 12 3-component seismic sensors (velocimeters). 3 of those 3-component velocimeters are installed on the Séchilienne landslide and co-located with 3-component accelerometers. This DOI only refers to the seismic signals recorded on the 4 OMIV landslides. These data are continuous records of 3-component seismic sensors and seismic antennas (vertical sensors located on a 100 m diameter circle centered on one 3-component sensor). Existing tools allow the use of these signals (i) to capture the response of the moving landslide to regional earthquakes, (ii) to identify endogenous signals that are emitted due to landslide deformation (i.e. endogenous micro-earthquakes, rockfalls, exotic signals), (iii) to use background noise to characterize changes in elastic properties of the landslide through time. Both velocimeter and accelerometer record can be available on these sites. The OMIV seismological data are distributed through RESIF , the French seismologic and geodetic network platform : continuous seismological data and earthquake response are both available through the RESIF portal (portal.resif.fr). All OMIV data are free open access data available through the OMIV data portal (http://omiv.osug.fr/data.html).

Citation Information

Digital Object Identifier (DOI) https://doi.org/10.15778/RESIF.MT
Citation
National French Landslide Observatory Facility And RESIF Datacenter. (2006). French Multidisciplinary Observatory of Versant Instabilities. RESIF - Réseau Sismologique et géodésique Français. https://doi.org/10.15778/resif.mt

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Data Availability

Data available from RESIF using FDSN Web Services. See http://www.resif.fr for more information including data access tools.

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