Abstract

Rapid response to the M<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow /> <mml:mi mathvariant="normal">w</mml:mi> </mml:msub></mml:math> 4.9 earthquake of November 11, 2019 in Le Teil, Lower Rhône Valley, France

Highlights

  • The French post-seismic unit (“cellule postsismique”) gathers, on a volunteer basis, scientists from various French research laboratories involved in seismological, geodetic and geological studies related to earthquakes

  • This paper describes the involvement of the French broad scientific community following the Mw 4.9 Le Teil earthquake of November 11, 2019 in Southern France, the various geological, seismological and geodetic interventions in the field, and the collected seismological data which is openly available to the scientific community within the RESIF infrastructure

  • The French post-seismic unit has largely contributed to coordinate the efforts of the several geology, seismology and geodesy groups deployed in the field and the laboratory groups dedicated to refining mainshock relocation and magnitude estimation and on analysing satellite data

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Summary

Introduction

The French post-seismic unit (“cellule postsismique”) gathers, on a volunteer basis, scientists from various French research laboratories involved in seismological, geodetic and geological studies related to earthquakes. This paper describes the involvement of the French broad scientific community following the Mw 4.9 Le Teil earthquake of November 11, 2019 in Southern France, the various geological, seismological and geodetic interventions in the field, and the collected seismological data which is openly available to the scientific community within the RESIF infrastructure It addresses some of the scientific perspectives opened by the very dense seismological network deployed in the near-fault area. Geological field investigations conducted two days after the mainshock revealed the occurrence of surface ruptures along the InSAR rupture (see Section 4), confirming the inherited NE–SW La Rouvière normal fault reactivated in reverse faulting during the Teil earthquake

Deployment of seismological and geodetic stations
Seismological network
Distributed acoustic sensing deployment
GPS measurements
Geological observations
Earthquake intensity and damages
Le Teil aftershocks sequence
A peculiar velocity structure in the epicenter area
Ground motion
Conclusion
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