Seismic activity in the Ubaye Region (French Alps): a specific behaviour highlighted by mainshocks and swarm sequences - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Comptes Rendus. Géoscience Année : 2021

Seismic activity in the Ubaye Region (French Alps): a specific behaviour highlighted by mainshocks and swarm sequences

Marion Baques
Louis de Barros
Maxime Godano
Françoise Courboulex
Christophe Larroque

Résumé

The Ubaye Region is the most seismically active region in the Western Alps, with earthquakes that were commonly felt by the population and that even damaged local villages and cities. Since the first testimonies in 1844, this area has been regularly struck by seismic swarms with a high number of events, such as in 2003–2004 or 2012–2015, or by mainshock–aftershock sequences with a magnitude up to ML 5.3 in 1959. In this paper, we analysed both historical records and instrumental seismicity in the light of geological observations. Some earthquakes could be associated with known faults, even if most of them occurred on blind, unknown faults that reveal a highly fractured basement. The abnormal level of seismicity, together with its peculiar behaviour, suggests complex driving processes involving not only tectonic loading but also fluid pressure.
Fichier principal
Vignette du fichier
CRGEOS_2021__353_S1_A11_0.pdf (3.24 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03364897 , version 1 (21-10-2021)

Licence

Paternité

Identifiants

Citer

Marion Baques, Louis de Barros, Clara Duverger, Hervé Jomard, Maxime Godano, et al.. Seismic activity in the Ubaye Region (French Alps): a specific behaviour highlighted by mainshocks and swarm sequences. Comptes Rendus. Géoscience, 2021, 353 (S1), pp.1-25. ⟨10.5802/crgeos.76⟩. ⟨hal-03364897⟩

Relations

88 Consultations
149 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More