Observatoire Multidisciplinaire des Instabilités de Versants







Seismic monitoring of Séchilienne


Objectives

Seismic network

Events detection
Real-time detection of events
Since November 2012, data from some RAP (OGS1,OGS2,OGS3) or OMIV (THE,RUI,GAL) stations are transferred and processed in near real-time. The catalog of detected events is available here in raw text format. Catalogs in html format with links to figures and RESIF seed data are also available for ! The most recent events, after the date of the last manual validation, may be misclassified.
The figure below shows rockfalls and quakes detected by OMIV seismic stations for the last month, and is updated automatically every hour.
Fig 1 (click to enlarge) : (top) Peak amplitude of seismic signals produced by rockfalls or quakes and detected by OMIV stations. (bottom) Number of events per day for each type of events and each network. Blue shaded area indicates preliminary results (automatic processing, not yet validated and incomplete). Black area indicates that data is not yet available. Dashed lines indicates the values that have been exceeded on average 5 times per year since 2007/5/16. Continuous horizontal lines are the maxima.
Other figures are available for last year or since the beginning of seismic monitoring in may 2007.

Information about seismic data
Seismograms in SAC format for each detected event are available from the html catalog by clicking on "SAC" in the last column (one zip file for all traces). For RAP stations (OGS1, OGS2 and OGS3), channels HH* are raw velocimetric data, WH* are 1-20 Hz bandpass filtered data, and HN* are accelerometric data. Vertical components are notted by *Z , horizontal compoents are *E and *N. Amplitude are in counts. For RAP stations, multiply velocimetric data by 3.33 to convert amplitude to nm/s, and accelerometric data by 0.00126 to obtain mm/s^2. For OMIV stations THE and RUI, multiply data by 0.3573 to convert from counts to nm/s. For OMIV station GAL, multiply by 2.2039.
Events location

Seismic activity, and correlation with displacement and climate

Seismicity data

Events catalogs

Publications and communications

Contacts