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Journal Articles Bulletin de la Société Géologique de France Year : 2015

SI-Hex: a new catalogue of instrumental seismicity for metropolitan France

Nicole Béthoux
  • Function : Author
Marie Calvet
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  • PersonId : 847298
Sébastien Chevrot
Bertrand Delouis
Anne Deschamps
Cécile Doubre
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  • PersonId : 923205
Julien Fréchet
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  • PersonId : 908821
Christophe Maron
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  • PersonId : 867082
Véronique Mendel
Arnaud Mignan
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  • PersonId : 848051
Julie Perrot
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  • PersonId : 888615
Olivier Sanchez
Matthieu Sylvander

Abstract

The aim of the SI-Hex project (acronym for « Sismicité Instrumentale de l’Hexagone ») is to provide a catalogue of seismicity for metropolitan France and the French marine economic zone for the period 1962–2009 by taking into account the contributions of the various seismological networks and observatories from France and its neighbouring countries. The project has been launched jointly by the Bureau Central Sismologique Français (CNRS-University/BCSF) and the Laboratoire de Détection et de Géophysique (CEA-DAM/LDG). One of the main motivations of the project is to provide the end user with the best possible information on location and magnitude of each earthquake. So far, due to the various procedures in use in the observatories, the different locations and magnitudes of earthquakes located in the SI-Hex zone were presenting large discrepancies. In the 2014 version of the catalogue, 1D localizations of hypocentres performed with a unique computational scheme and covering the whole 1962–2009 period constitute the backbone of the catalogue (SI-Hex solutions). When available, they are replaced by more precise localizations made at LDG or, for recent times, by the regional observatories within: 1) the French Alps, 2) the southernmost Alps and the Mediterranean domain including Corsica, 3) the Pyrenees, and 4) the Armorican massif. Moment magnitudes Mw are systematically reported in the SI-Hex catalogue. They are computed from coda-wave analysis of the LDG records for most Mw>3.4 events, and are converted from local magnitudes ML for smaller magnitude events. Finally, special attention is paid to the question of discrimination between natural and artificial seismic events in order to produce a catalogue for direct use in seismic hazard analysis and seismotectonic investigations. The SI-Hex catalogue is accessible on the web site www.franceseisme.fr and contains 38,027 earthquake hypocentres, together with their seismic moment magnitudes Mw.
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Dates and versions

insu-01153693 , version 1 (20-05-2015)

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Cite

Michel Cara, Yves Cansi, Antoine Schlupp, Pierre Arroucau, Nicole Béthoux, et al.. SI-Hex: a new catalogue of instrumental seismicity for metropolitan France. Bulletin de la Société Géologique de France, 2015, 186 (1), pp.3-19. ⟨10.2113/gssgfbull.186.1.3⟩. ⟨insu-01153693⟩
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