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Poster Communications Year : 2019

A unified Mw-based earthquake catalog for metropolitan France consistent with European catalogs

Abstract

Probabilistic seismic hazard assessment (PSHA) requires the establishment of earthquake catalogs in the moment magnitude (Mw) scale, consistent with that used to derive Ground Motion Prediction Equations. The Si-Hex catalog (1962-2009) is the first catalog of instrumental seismicity in Mw published for metropolitan France. It represents a breakthrough in terms of merging all the data collected by the various French observation services. However, uncertainties remain especially concerning the coherence of Mw at the European level. In order to obtain an Mw catalog that is coherent with the neighboring countries, we propose to follow a similar strategy to the one employed for the Italian catalog. In the first step, an extensive dataset of Mw is collected from several national and foreign agencies or specific studies. Heterogeneities exist between these Mw due to the use of different computation methods, input data and seismic networks. The Mw are then unified by correcting the systematic discrepancies relative to the "Harvard" Mw (GCMT). In the second step, a magnitude scale conversion is developed between these Mw and the local French magnitudes (ML_LDG), and applied to all seismic events without a direct estimation of Mw (the majority of events). Finally, this new instrumental catalog is compared with Si-Hex, as well as with neighboring countries' catalogs in terms of Mw and impact on hazard.
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hal-02635592 , version 1 (27-05-2020)

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  • HAL Id : hal-02635592 , version 1

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Aurore Laurendeau, Christophe Clement, Oona Scotti. A unified Mw-based earthquake catalog for metropolitan France consistent with European catalogs. 27ème Assemblée Générale de l’Union Générale de Géodésie et de Géophysique IUGG, Jul 2019, MONTRÉAL, Canada. 2019. ⟨hal-02635592⟩
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