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Observation tasks

Task Geodesy


The task of the OMIV Geodesy Data Centre is to acquire, store and disseminate observations on the displacement and deformation pattern using different technologies:

  • permanent GNSS networks to monitor surface displacements (requested accuracy of the estimated East, North and Up coordinates: < 1 cm);
  • permanent surveys of benchmarks installed at the landslide surface using automatic total stations (requested accuracy of the estimated East, North and Up coordinates: < 2 cm);
  • campaigns of airborne and terrestrial LiDAR on the most active parts of the landslide to obtain images of the kinematics (requested accuracy of the estimated East, North and Up coordinates: < 4 cm);
  • permanent monitoring using terrestrial optical cameras and image correlation techniques (requested accuracy of the estimated East, North and Up coordinates: < 4 cm).

These observations are performed in close collaboration with local stakeholders and risk managers, such as RTM04 for Super-Sauze and La Valette landsides, CETE Mediterrannée for the La Clapière landslide, and CETE Lyon for the Séchilienne landslide.

Task Meteorology & Hydro-chemistry


The task of the OMIV Meteorology and Hydro-chemistry Data Centre is to acquire, store and disseminate obsservations on meteorological triggers of slope instability on and at proximity of the landslides, and on the landslide hydrological and hydro-chemical response. The task consists in collecting information on:

  • the local and regional meterology through the setup of weather stations;
  • the slope hydrology in the critical zone (unsaturated and saturated zone) using hydrogeological (piezometers), hydrochemical (ion/cation analysis, isotope analysis, water quality) and hydrogeophysical (soil resistivity, soil temperature) techniques.

Task Seismology


The task of the OMIV Seismology Data Centre is to acquire, store and disseminate three types of seismological information related to landslide dynamics:

  • continuous seismological records of the landslide (e.g. raw signals recorded at each seismic sensor);
  • the landslide response to regional earthquakes (e.g. the signal of regional earthquakes recorded on the landslide);
  • the seismic records of events occurring within (e.g. slidequakes, rockfalls) or very close (e.g. small local earthquakes) to the landslide.

Task Event catalogue

The task of the OMIV Event Catalogue Data Centre is to acquire, store and disseminate information on the spatial and temporal distribution of landslides at the scale of lithological regions (Ubaye Velley, Tinée Valley, Trièves, Romanche), through the collection of data on:

  • landslide catalogues (landlside type, date and intensity);
  • landslide controlling factors (relief, lithology, local geodynamics, landcover).