S046-0002
Recent evolutions of the GEOSCOPE broadband seismic observatory

Monday, 14 December 2020
Poster
Nicolas Leroy1, Martin Vallée1, Dimitri Zigone2, Jean-Yves Thore2, Frédérick Pesqueira1, Armelle Bernard3, Félix Léger1, Eleonore Stutzmann4, Michel Le Cocq1, Constanza Pardo1 and Olivier Sirol1, (1)Université de Paris, Institut de physique du globe de Paris, Paris, France, (2)EOST, École et Observatoire des Sciences de la Terre, Strasbourg, France, (3)Institut de Physique du Globe Strasbourg, Strasbourg Cedex, France, (4)Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, France
Abstract:
The GEOSCOPE observatory provides 38 years of continuous broadband data to the scientific community. The 34 operational GEOSCOPE stations are installed in 18 countries, across all continents and on islands throughout the oceans. They are equipped with three component very broadband seismometers (STS1 with warpless base plates to decrease long period noise on horizontal components by up to 15dB., STS2, STS6A, T120PH, T240) and 24/26 bit digitizers (Q330HR, Centaur).

Recent instrumental improvements include the installations/upgrades of the following stations: EDA (Cameroun, new station), CCD (Antarctica, see dedicated poster), IVI (Greenland), MBO (Senegal, moved and now SOK), FDF (Martinique, moved and now FDFM).

The next VBB seismometer generation is being evaluated: a STS6A has been tested in SSB and installed in SOK, a T360-GSN-Vault has been purchased. SSB station testing facility has been improved and allows for very low noise testings and comparisons to reference seismometers (STS1 and STS2).

All stations send data in real time to IPGP data center. Data are automatically transmitted to other data centers (IRIS-DMC and RESIF) and tsunami warning centers. After a few months, data are validated by IPGP (28 stations) and EOST (6 stations) in order to check their continuity and integrity. A scientific data validation is also performed by analyzing seismic noise level of the continuous data and by comparing real and synthetic earthquake waveforms. After these validations, data are archived by the IPGP data center. They are made available to the international scientific community through different interfaces.

The GEOSCOPE observatory also provides near-real time information on the World large seismicity (above magnitude 5.5-6) through the automated use of the SCARDEC method. Earthquake parameters (depth, moment magnitude, focal mechanism, source time function) are determined about 45 minutes after the occurrence of the event. A specific webpage is then generated, which also includes information for a non-seismologist audience (past seismicity, foreshocks and aftershocks, 3D representations of the fault motion...). This information is also disseminated in real-time through mailing lists and social networks. See: http://geoscope.ipgp.fr/index.php/en/data/earthquake-data/latest-earthquakes.

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