Post-seismic permeability change in a shallow fractured aquifer following a M-L 5.1 earthquake (Fourbanne karst aquifer, Jura outermost thrust unit, eastern France)

Creators: Charmoille, A.; Fabbri, O.; Mudry, J.; Guglielmi, Y.; Bertrand, C.

Other:: Géoazur (GEOAZUR 6526) ; Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)

Description

Following a M L 5.1 earthquake in eastern France, a post-seismic 12-day long electrical conductivity increase was recorded in the water discharging from a karst aquifer located 3 km from the epicentre. We attribute this to a permeability enhancement which allowed long-residence time water from low-permeability fractures located in the saturated zone to be expelled. The permeability enhancement shows that shallow aquifers can be significantly deformed for several days by moderate magnitude earthquakes.

Abstract

Geophysical Research Letters, v. 32, p. L18406, 2005. http://dx.doi.org/10.1029/2005GL023859

Abstract

International audience

Post-seismic permeability change in a shallow fractured aquifer following a M-L 5.1 earthquake (Fourbanne karst aquifer, Jura outermost thrust unit, eastern France)

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