Earthquakes: Description

GEOSCOPE provides earthquake characteristics and associated data for earthquakes with magnitude larger than 5.5-6, and for smaller earthquakes when located in France or in the Euro-Mediterranean region.

First information related to an earthquake is typically posted 45 minutes after earthquake origin. An update is done later in order to provide access to the data over a ~5h30 long window starting at the earthquake origin time. Data (seismograms) are raw data (not yet validated), and mainly come from real-time protocols. Time is in UTC and epicentral locations are from USGS.

Data and information related to an earthquake include:

  • Since 1st January 2014 : earthquake characteristics determined by SCARDEC method: magnitude, depth, focal mechanism and source time function. The agreement between real and modelled data is also shown. Validated SCARDEC solutions are updated every year on the SCARDEC website, where solutions for earthquakes since 1992 are also available.
  • Earthquake localization maps in the context of historical seismicity
  • A data archive containing the metadata information and the continuous data of the operational stations1
  • Theoretical arrival times (P, PP, PcP,PKP,S,ScS, SKS) at GEOSCOPE stations
  • Graphics of the BH and LH channels for each station
  • Schematic view of the earthquake mechanism (Since 1st January 2014)

1 Up to May 10, 2022 the data related to an earthquake was distributed in a SEED volume. After this date, the metadata is distributed in FDSN StationXML format and  waveforms in a miniSEED volume.

For some earthquakes, additional information provided by other institutes/organisms is provided.

Earthquake catalogues are available from 2006. In the 2006-2013 period, there is no access to SCARDEC information.

To be informed in real-time on the determination of recent earthquakes characteristics, you can follow the twitter account @geoscope_ipgp.

Several e-mail alerts are available, as soon as a new earthquake has been analyzed: (1) for all earthquakes, (2) for earthquakes with Mw>=6.5, and (3) for earthquakes with Mw>=7.

Please contact Martin Vallée (This email address is being protected from spambots. You need JavaScript enabled to view it.) to be added in one of these mailing lists.