Physics – Geophysics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.1955p&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 11, p. 1955-1958
Physics
Geophysics
21
Exploration Geophysics: Magnetic And Electrical Methods, Hydrology: Reservoirs (Surface), Hydrology: Groundwater Transport, Seismology: Seismic Hazard Assessment And Prediction
Scientific paper
Electric potential variations have been recorded from November 1995 to February 1996 and continuously since October 1996 at 14 measurement points on a one km wide ridge separating two lakes in the French Alps. The levels of the lakes vary by several tens of meters on a yearly cycle, inducing stress variations and fluid percolation. At one point, unambiguous variations as large as 120 mV are observed over a year, linearly correlated with the levels of the lakes with a magnitude of 2 mV per meter of water level change. This particular measurement point lies at the edge of a SP anomaly, which supports the presence of a localized zone of ground water flow forced by the lake level, suggesting an electrokinetic mechanism. The observed correlation implies a ζ-potential of the order of -8 mV for a 60 Ωm electrolyte, in agreement with laboratory measurements.
Avouac Jean-Philippe
Hautot Sophie
Lorne Benoit
Perrier Frédéric
Tarits Pascal
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