Observatoire Multidisciplinaire des Instabilités de Versants

Seismic monitoring of Séchilienne

Seismic network

Events detection and classification

Real time detection

Events location

Seismic activity, and correlation with displacement and climate

Seismicity data

Events catalogs

Catalogs of events in text format are available here for:
  • All events detected by OMIV stations (THE, RUI and GAL) since May 2007 (updated every 2-3 months)
  • All events detected by station THE since October 2012 (updated automatically every hour)
Catalogs are also available in html with links to figures and SAC files. These catalog includes all types of events:
  • R : rockfalls
  • Q : micro-earthquakes (within rockslide)
  • S : distant earthquakes (outside rockslide, with distinct P and S waves, located at more than 4 km from the rockslide)
  • X : calibration shots
The characteristics of events in these catalogs are:
  • A: peak amplitude in nm/sec averaged over all traces in the frequency range 2-50 Hz
  • E: energy defined as the integral over the event duration of the squared signal amplitude
  • T: duration of the signal in sec
  • f: peak frequency, in Hz
  • mag: magnitude
  • magl: for earthquakes located by another network, mag is the magnitude reported by this other network and magl is the magnitude determined using the Sechilienne network
  • lat,lon: latitude and longitude in decimal degrees (North and East)
  • z: depth in km (< 0 above see level)
  • d: distance in km between hypocenter and the rockslide (location of the 3C sensor of station THE), for earthquakes
  • az: azimut of the source relative to the rockslide (location of the 3C sensor of station THE), 0=North, 90=East
  • no: number of stations that recorded the event
  • dt: obsreved time delay between event source and detection at Sechilienne (only for earthquakes)
  • dtmod: modelled travel time between event source and detection at Sechilienne (only for earthquakes)
  • typ: type of event (see description above)
  • network: 'SECH' for local events or earthquakes not detected by another seismic network, or name of the network that detected and located the earthquake: 'SISM' for SISMALP, 'RENA' for RENASS, 'HARV' for Harvard CMT
A value of -10 for any of these fileds indicate that the data is not available.

Figures caption:
  • top: seismograms of all vertical velocimeters, lowpass fitered below 50Hz, with same amplitude scale for all traces.
  • bottom: spectrogramm averaged over all traces, with amplitude in log scale

Publications and communications