Characteristics and possible origins of the seismicity in northwestern France
Type | Article | ||||||||||||
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Date | 2021 | ||||||||||||
Language | English | ||||||||||||
Author(s) | Beucler Éric1, 2, Bonnin Mickael1, 2, Hourcade Céline1, Van Vliet-Lanoë Brigitte3, Perrin Clément1, 2, Provost Ludmila4, Mocquet Antoine1, Battaglia Jean5, Geoffroy Laurent3, Steer Philippe6, Le gall Bernard3, Douchain Jean-Michel7, Fligiel Damien2, Gernigon Pierrick2, Delouis Bertrand8, Perrot Julie3, Mazzotti Stéphane9, Mazet-Roux Gilles10, Lambotte Sophie11, 12, Grunberg Marc12, Vergne Jérôme11, 12, Clément Christophe4, Calais Éric13, 14, Deverchère Jacques3, Longuevergne Laurent6, Duperret Anne15, Roques Clément6, Kaci Tassadit15, Authemayou Christine3 | ||||||||||||
Affiliation(s) | 1 : Laboratoire de Planétologie et Géodynamique (LPG), CNRS-6112, Université de Nantes, Université d’Angers, France 2 : Observatoire des Sciences de l’Univers Nantes-Atlantique (OSUNA), CNRS-3281, Université de Nantes, France 3 : Univ Brest, CNRS, LGO UMR6538, IUEM, Place Nicolas Copernic, 29280 Plouzané, France 4 : Institut de Radioprotection et Sûreté Nucléaire (IRSN), PSE-ENV, SCAN, BERSSIN, France 5 : Université Clermont Auvergne, CNRS, IRD, OPGC, LaboratoireMagmas et Volcans, F-63000 Clermont-Ferrand, France 6 : Univ Rennes, CNRS, Géosciences Rennes -UMR 6118, F-35000 Rennes, France 7 : Observatoire de Physique du Globe de Clermont-Ferrand, Université Clermont Auvergne - CNRS, Aubière, France 8 : Université Côte d’Azur, CNRS, Observatoire de la Côte d’Azur, IRD, Géoazur, France 9 : Géosciences Montpellier, Université deMontpellier, CNRS, Université des Antilles, France 10 : CEA, DAM, DIF, Arpajon, France 11 : ITES, Université de Strasbourg/CNRS, Strasbourg, France 12 : EOST, Université de Strasbourg/CNRS, Strasbourg, France 13 : Department of Geosciences, École normale supérieure, CNRS UMR 8538, PSL Université, France 14 : Institut de Recherche pour le Développement, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS Géoazur, France 15 : Laboratoire ondes et milieux complexes (LOMC), CNRS-6294, Université Le Havre Normandie, France |
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Source | Comptes Rendus Geoscience (1631-0713) (Cellule MathDoc/CEDRAM), 2021 , Vol. 353 , N. S1 , P. 1-25 | ||||||||||||
DOI | 10.5802/crgeos.86 | ||||||||||||
WOS© Times Cited | 4 | ||||||||||||
Keyword(s) | Brittany, Auvergne, SCR, Magnitude, Detection, Earthquake, Resif-Epos | ||||||||||||
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. |
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