Rapid response to the Mw 4.9 earthquake of November 11, 2019 in Le Teil, Lower Rhône Valley, France - Archive ouverte HAL Access content directly
Journal Articles Comptes Rendus. Géoscience Year : 2021

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
Laurence Audin
Jérémy Billant
Mohamed Chlieh
Bertrand Delouis
Anne Deschamps
Matthieu Ferry
Michael Foumelis
  • Function : Author
Christophe Larroque
Kevin Manchuel
  • Function : Author
EDF
Christophe Maron
  • Function : Author
Emmanuel Mathot
  • Function : Author
Emeline Maufroy
  • Function : Author
  • PersonId : 952061
Emmanuelle Neyman
  • Function : Author
J.F. Ritz
Diane Rivet
Anthony Sladen
Christophe Voisin
Elise Beck
Pierre Briole
Didier Brunel
Olivier Cavalié
  • Function : Author
Jérôme Chèze
Françoise Courboulex
Tiziano Giampietro
Maxime Godano
Gauthier Guerin
Stephane Guillot
Cécile Lasserre
Chao Liang
Itzhak Lior
Xavier Martin
Daniel Mata
Antoine Mercier
Aurélien Mordret
Elif Oral
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Anne Paul
Fabrice Peix
Claudio Satriano
Valérie Sellier
  • Function : Author
Christian Sue
Martin Vallée
Martijn van den Ende
Philippe Vernant
Huihui Weng

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.
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Dates and versions

hal-03089600 , version 1 (28-12-2020)
hal-03089600 , version 2 (12-01-2022)

Licence

Attribution - NonCommercial - NoDerivatives - CC BY 4.0

Identifiers

Cite

Cécile Cornou, Jean-Paul Ampuero, Coralie Aubert, Laurence Audin, Stéphane Baize, et al.. Rapid response to the Mw 4.9 earthquake of November 11, 2019 in Le Teil, Lower Rhône Valley, France. Comptes Rendus. Géoscience, 2021, 353 (S1), pp.1-23. ⟨10.5802/crgeos.30⟩. ⟨hal-03089600v2⟩
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