Abstract
Seismic swarms in Tricastin, lower Rhône Valley (France): review of historical and instrumental seismicity and models
Highlights
Southeastern France is a region of moderate but shallow seismic activity, sometimes affected by locally devastating earthquakes
Hundreds of seismic events are mentioned in local chronicles, many documented by the Bureau Central Seismologique [e.g. Rothé, 1936, 1939a], which instrumented two Mainka seismological stations in Les Granges-Gontardes at short distance from the 1934–1936 swarm
The most important crises in number of events occurred in 1772–1773, 1873, and 1933–1936. Many of these events have been described as accompanied by noise of cannonade, explosion, or collapse with a strong attenuation of the shaking at short distance, suggesting shallow depths as well as other similarities with the recent crisis
Summary
Southeastern France is a region of moderate but shallow seismic activity, sometimes affected by locally devastating earthquakes. ISSN (electronic) : 1778-7025 https://comptes- rendus.academie- sciences.fr/geoscience/ The realisation of such shallow earthquakes promote the acquisition of rich historical macroseismic catalogues, when occurring in regions with meaningful population densities, which is the case in most of Southeastern France. In 2002–2003, one of these local swarms developed in the Tricastin, a region with industrial complexes and nuclear installations [e.g. Clément et al, 2004], about 20 km to the southeast of the 2019 Le Teil rupture (Figures 1 and 2) This swarm was monitored by a dedicated local network that recorded 130 events of magnitude ranging from ML −1.3 to 1.7 [Thouvenot et al, 2009] and provided good constraints on the local events depths. We discuss a large number of local swarm generation models, involving and testing their consistence with the observations available
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