Characteristics and possible origins of the seismicity in northwestern France

Beucler É.; Mickael Bonnin; Céline Hourcade; Brigitte van Vliet-Lanoë; Clement Perrin; Ludmila Provost; Antoine Mocquet; Jean Battaglia; Laurent Geoffroy; Philippe Steer; Bernard Le gall; Jean-Michel Douchain; Damien Fligiel; Pierrick Gernigon; B. Delouis; Julie Perrot; Stéphane Mazzotti; Gilles Mazet-Roux; Sophie Lambotte; Marc Grunberg; Jerôme Vergne; Christophe Clément; Éric Calais; Jacques Deverchère; Laurent Longuevergne; Anne Duperret; Clément Roques; Tassadit Kaci; Christine Authemayou

doi:10.5802/crgeos.86

Journal articles

Characteristics and possible origins of the seismicity in northwestern France

Beucler É. ^{1, 2} Mickael Bonnin ^{1, 2} Céline Hourcade ¹ Brigitte van Vliet-Lanoë ^{3, 1} Clement Perrin ¹ Ludmila Provost ⁴ Antoine Mocquet ¹ Jean Battaglia ⁵ Laurent Geoffroy ³ Philippe Steer ⁶ Bernard Le gall ³ Jean-Michel Douchain ⁷ Damien Fligiel ² Pierrick Gernigon ² B. Delouis ⁸ Julie Perrot ³ Stéphane Mazzotti ⁹ Gilles Mazet-Roux ¹⁰ Sophie Lambotte ^{11, 12} Marc Grunberg ¹¹ Jerôme Vergne ^{11, 12} Christophe Clément ⁴ Éric Calais ^{8, 13} Jacques Deverchère ³ Laurent Longuevergne ⁶ Anne Duperret ¹³ Clément Roques ⁶ Tassadit Kaci ¹³ Christine Authemayou ³

1 LPG - Laboratoire de Planétologie et Géodynamique [UMR 6112]

2 OSUNA - Observatoire des Sciences de l'Univers Nantes Atlantiques

3 IUEM - Institut Universitaire Européen de la Mer

4 PSE-ENV/SCAN/BERSSIN

5 LMV - Laboratoire Magmas et Volcans

6 GR - Géosciences Rennes

7 OPGC - Observatoire de Physique du Globe de Clermont-Ferrand

8 GEOAZUR 7329 - Géoazur

9 Géosciences Montpellier

10 CEA - Commissariat à l'énergie atomique et aux énergies alternatives

11 EOST - Ecole et Observatoire des Sciences de la Terre

12 ITES - Institut Terre Environnement Strasbourg

13 LOMC - Laboratoire Ondes et Milieux Complexes

Abstract : The macroseismic and instrumental observations accumulated by the Bureau Central Sismologique Français and other national agencies over the last 100 years show that the northwestern part of metropolitan France is affected by an apparently diffuse and moderate intraplate seismicity. Far from any plate boundary, well-documented inherited structures, such as the Armorican shear zone network, the Sillon Houiller, and the normal faults related to the Atlantic ocean margin, likely exert significant control on the regional seismicity pattern. However, in the absence of a clearly measurable strain field, processes other than far-field tectonic stress loading such as erosion, gravitational potential energy, and/or hydraulic loadings can co-exist, but their respective influence on the current seismicity is debated and remains to be fully addressed. Reliable detection/location of low-to-moderate magnitude events is one of the most important challenges in the near future to better understand the processes that control this intraplate seismicity. As shown here for a limited region, this issue can be achieved positively, thanks to the new Résif-Epos network, in conjunction with sophisticated algorithms for both earthquakes’ detection and discrimination.

Keywords : Auvergne Brittany Detection Magnitude SCR Résif-Epos Earthquake

Document type :

Journal articles

Domain :

Sciences of the Universe [physics] / Earth Sciences

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Submitted on : Wednesday, November 10, 2021 - 10:03:39 AM
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Characteristics and possible origins of the seismicity in northwestern France

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