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)

A. Charmoille , O. Fabbri , J. Mudry , Y. Guglielmi (1) , C. Bertrand

1 GEOAZUR 6526 - Géoazur

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.

Domaines: Planète et Univers [physics]

A. Charmoille, O. Fabbri, J. Mudry, Y. Guglielmi, C. Bertrand. 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). Geophysical Research Letters, 2005, 32, pp.L18406. ⟨10.1029/2005GL023859⟩. ⟨hal-00407426⟩