Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Triggered Seismicity in a Flooded Former Coal Mining Basin (Gardanne Area, France)

Abstract : We studied the correlation between seismicity and the water table level in an abandoned coal mine (Bouches-du-Rhône, France), closed in 2003, where groundwater has been pumped out since 2010 to prevent underground flooding. Microseismicity was first felt by the population in 2010 and a strongly felt seismic swarm occurred in November 2012. The origin of the seismicity was therefore questioned, in relation to both the potential instability of old, shallow galleries that might generate damage at the surface and a local seismic hazard assessment. A temporary dense seismic network in the area allowed us to analyse the spatial distribution of the seismicity in detail. Most of the seismicity was clearly located under the mine workings, highlighting that an existing fault system crossing the mining operation was being hydraulically activated, in accordance with the known tectonic extension regime. Our analysis clearly shows a spatiotemporal relationship between seismic migration and the level of the mine aquifer between 2013 and 2017. Thus, seismicity will persist with oscillations of the mining aquifer, depending on the pumping capacities and effective rainfall. Continuous hydraulic and seismic monitoring is necessary to better understand these phenomena and assess the associated risks.
Type de document :
Article dans une revue
Liste complète des métadonnées

https://hal-brgm.archives-ouvertes.fr/hal-03711145
Contributeur : Frédérique COUFFIGNAL Connectez-vous pour contacter le contributeur
Soumis le : vendredi 1 juillet 2022 - 11:00:51
Dernière modification le : mercredi 3 août 2022 - 04:06:17

Fichier

Dominique2022_Article_Triggere...
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Pascal Dominique, Hideo Aochi, Jacques Morel. Triggered Seismicity in a Flooded Former Coal Mining Basin (Gardanne Area, France). Mine Water and the Environment, Springer Verlag, 2022, 41 (2), pp.317 - 334. ⟨10.1007/s10230-022-00860-z⟩. ⟨hal-03711145⟩

Partager

Métriques

Consultations de la notice

1094

Téléchargements de fichiers

5934