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Published September 14, 2020 | Submitted
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Rapid response to the M_w 4.9 earthquake of November 11, 2019 in Le Teil, Lower Rhône Valley, France

Cornou, Cécile ORCID icon
Ampuero, Jean-Paul ORCID icon
Aubert, Coralie
Audin, Laurence
Baize, Stéphane
Billant, Jérémy
Brenguier, Florent
Causse, Mathieu
Chlieh, Mohamed
Combey, Andy
de Michele, Marcello
Delouis, Bertrand ORCID icon
Deschamps, Anne
Ferry, Matthieu
Foumelis, Michael
Froment, Bérénice
Gélis, Céline
Grandin, Raphaël ORCID icon
Grasso, Jean-Robert ORCID icon
Hannouz, Estelle
Hok, Sébastien
Jung, Axel
Jolivet, Romain ORCID icon
Langlais, Mickaël
Langlaude, Philippe
Larroque, Christophe
Leloup, Philippe Hervé
Manchuel, Kevin
Marconato, Léo
Maron, Christophe
Mathot, Emmanuel
Maufroy, Emeline
Mercerat, Diego
Métois, Marianne
Neyman, Emmanuelle
Pondaven, Ildut
Provost, Ludmila
Régnier, Julie
Ritz, Jean-François
Rivet, Diane
Schlupp, Antoine
Sladen, Anthony ORCID icon
Voisin, Christophe
Walpersdorf, Andrea
Wolynieck, David
Allemand, Pascal
Beck, Elise
Bertrand, Etienne
Bertrand, Véronique
Briole, Pierre ORCID icon
Brunel, Didier
Cavalié, Olivier
Chèze, Jérôme
Courboulex, Françoise
Douste-Bacqué, Isabelle
Dretzen, Rémi
Giampietro, Tiziano
Godano, Maxime
Grandjean, Philippe
Grunberg, Marc ORCID icon
Guérin, Gauthier
Guillot, Stéphane ORCID icon
el Haber, Elias
Hernandez, Alain
Jomard, Hervé
Lasserre, Cécile
Liang, Chao
Lior, Itzhak
Martin, Xavier
Mata, Daniel
Ménager, Marine
Mercier, Antoine
Mordret, Aurélien
Oral, Elif ORCID icon
Paul, Anne
Peix, Fabrice
Péquégnat, Catherine
Pernoud, Michel
Satriano, Claudio ORCID icon
Sassi, Rihab
Schaming, Marc
Sellier, Valérie
Sira, Christophe
Socquet, Anne
Sue, Christian
Trilla, Aurélie
Vallée, Martin ORCID icon
van den Ende, Martijn
Vernant, Philippe
Vial, Benjamin
Weng, Huihui ORCID icon


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.

Additional Information

License: CC-By Attribution 4.0 International. Created: September 05, 2020 | Last edited: September 05, 2020. This manuscript has been submitted for publication in Comptes Rendus Geosciences. Please note that the manuscript has yet been accepted for publication. We acknowledge mayors and inhabitants of le Teil, Viviers, Aubinas, Saint Thomé, Alba-la-Romaine, Larnas and Chateauneuf-du-Rhône who help us in deployment of seismological and geodetic stations in the field. We acknowledge prefectures and SIDPC of Drôme and Ardèche departments, and mayors, town hall employers and inhabitants of the 24 cities visted by the GIM Team. Field experiments were supported by fundings from ISTerre, Géoazur, CEREMA, IRSN, Géosciences Montpellier, LGL-TPE, PACTE, EOST/BCSF-RéNass, RAP-RESIF, INSU, Action Transversale Sismicité (ATS) of RESIF. RESIF is a national Research Infrastructure recognized as such by the French Ministry of higher education and research. It is additionally supported by a public grant overseen by the French national research agency (ANR) as part of the "Investissements d'Avenir" program (reference: ANR-11-EQPX-0040) and the French Ministry of ecology, sustainable development and energy. RESIF; (1995): RESIF-RLBP French Broad-band network, RESIF-RAP strong motion network and other seismic stations in metropolitan France; RESIF - Réseau Sismologique et géodésique Français. http://dx.doi.org/10.15778/RESIF.FR. RESIF; (1995): RESIF-RAP French Accelerometric Network; RESIF - Réseau Sismologique et géodésique Français. http://dx.doi.org/10.15778/RESIF.RA. Bertrand, E., Cornou, C., Gélis, C., Rivet, D., & SISMOB-RESIF. (2019). Le Teil P5 post seismic experiment. RESIF - Réseau Sismologique et géodésique Français. https://doi.org/10.15778/10.15778/RESIF.3C2019. AlpArray Seismic Network; (2015): AlpArray Seismic Network (AASN) temporary component. AlpArray Working Group. http://dx.doi.org/10.12686/alparray/z3_2015. Sentinel-1 data used in this study is copyright of European Commission (EU), Copernicus program, operated by the European Space Agency (ESA). The data was obtained via the PEPS portal of the Centre National d'Etudes Spatiales (CNES). The DAS measurements were made on the Ardèche Drôme Numérique telecom network with the help of the people from the ADTIM company in charge of the network. Information on the historical earthquake were extracted from the SisFrance, BRGM, EDF, ISRN database (last accessed, February 4, 2020).

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