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Seismic swarms in Tricastin, lower Rhône Valley (France): review of historical and instrumental seismicity and models
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Seismic swarms in Tricastin, lower Rhône Valley (France): review of historical and instrumental seismicity and models
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Journal Article
Seismic swarms in Tricastin, lower Rhône Valley (France): review of historical and instrumental seismicity and models
2021
Overview
The Tricastin region in the lower Rhône Valley (France) is affected by an atypical seismic activity characterised by the development of long-lasting and recurrent seismic swarms. Indeed, since the 16th century, hundreds of seismic events sometime associated with underground noises of the explosion have been reported by local inhabitants. However, to date, none of the many scenarios of earthquake generation proposed for the area, involving either tectonics and/or hydrological forcings, appears consensual. To overcome that lack of comprehension, we compile and analyse an 880 seismic-events catalogue derived from both historical macroseismicity and instrumental records. The earthquakes appear to occur at shallow depths similar to those determined below a local network in 2002–2003. We confront to this catalogue models involving hydrological mechanisms, including aquifers elastic loading and karst-drains responses, as well as tectonic mechanisms, including transient aseismic processes and their related effects on the fold hinges or on the local fault planes. Most of the earthquakes are located at short distances from karst drains and fractured fold hinges, possibly affected by transient hydrological changes.
Publisher
Académie des Sciences. Institut de France,Académie des sciences (Paris),Académie des sciences
Subject
