Physics – Geophysics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3529g&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 23, p. 3529-3532
Physics
Geophysics
2
Atmospheric Composition And Structure: Pressure, Density, And Temperature, Exploration Geophysics: Magnetic And Electrical Methods, Hydrology: Unsaturated Zone, Physical Properties Of Rocks: Fracture And Flow
Scientific paper
Electric self-potentials (SP) and strains were measured on the surface of a pillar of the abandoned underground Meriel limestone quarry (France). The time variations of strains and SP are interpreted in terms of crack instability. The dynamic mapping technique shows that the most intensive SP variations, corresponding to maximum stress variations estimated from strain data, occur in the vicinity of active crack tips or crack intersections. The location of these maxima changes with the stress distribution variations. The synchronous stacking technique allows to detect significant pressure variations through electrodes installed in the fractured zone as well as through outside electrodes close to the medium discontinuities (petrological boundaries and pillar edges).
Gensane Olivier
Konyukhov Boris
Morat Pierre
Mouël Jean-Louis Le
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