Rapid response to the Mw 4.9 earthquake of November 11, 2019 in Le Teil, Lower Rhône Valley, France
Réponse rapide au tremblement de terre Mw 4.9 du 11 novembre 2019 au Teil, dans la basse vallée du Rhône, en France
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Jean-Paul Ampuero
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Laurence Audin
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Mohamed Chlieh
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Bertrand Delouis
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Anne Deschamps
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Matthieu Ferry
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Michael Foumelis
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Christophe Larroque
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Philippe Hervé Leloup
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Diego Mercerat
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Emmanuelle Neyman
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J.F. Ritz
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Diane Rivet
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Anthony Sladen
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Christophe Voisin
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Pascal Allemand
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Elise Beck
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Etienne Bertrand
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Véronique Bertrand
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Pierre Briole
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Françoise Courboulex
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Maxime Godano
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Marc Grunberg
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Gauthier Guerin
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Stephane Guillot
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Cécile Lasserre
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Marine Menager
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Antoine Mercier
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Aurélien Mordret
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Anne Paul
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Claudio Satriano
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Valérie Sellier
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Christian Sue
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Martin Vallée
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Martijn van den Ende
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Philippe Vernant
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Huihui Weng
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Abstract
On November 11, 2019, a Mw 4.9 earthquake hit the region close to Montelimar (lower Rhône Valley, France), on the eastern margin of the Massif Central close to the external part of the Alps. Occuring in a moderate seismicity area, this earthquake is remarkable for its very shallow focal depth (between 1 and 3 km), its magnitude, and the moderate to large damages it produced in several villages. InSAR interferograms indicated a shallow rupture about 4 km long reaching the surface and the reactivation of the ancient NE-SW La Rouviere normal fault in reverse faulting in agreement with the present-day E-W compressional tectonics. The peculiarity of this earthquake together with a poor coverage of the epicentral region by permanent seismological and geodetic stations triggered the mobilisation of the French post-seismic unit and the broad French scientific community from various institutions, with the deployment of geophysical instruments (seismological and geodesic stations), geological field surveys, and field evaluation of the intensity of the earthquake. Within 7 days after the mainshock, 47 seismological stations were deployed in the epicentral area to improve the Le Teil aftershocks locations relative to the French permanent seismological network (RESIF), monitor the temporal and spatial evolution of microearthquakes close to the fault plane and temporal evolution of the seismic response of 3 damaged historical buildings, and to study suspected site effects and their influence in the distribution of seismic damage. This seismological dataset, completed by data owned by different institutions, was integrated in a homogeneous archive and distributed through FDSN web services by the RESIF data center. This dataset, together with observations of surface rupture evidences, geologic, geodetic and satellite data, will help to unravel the causes and rupture mechanism of this earthquake, and contribute to account in seismic hazard assessment for earthquakes along the major regional Cévenne fault system in a context of present-day compressional tectonics.
Origin : Publisher files allowed on an open archive