Transient electric signals prior to rock failure under uniaxial compression

Details Transient electric signals prior to rock failure under uniaxial compression Transient electric signals prior to rock failure under uniaxial compression

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.1687h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 16, p. 1687-1690

Physics

28

Axial Compression Loads, Compression Tests, Earthquakes, Electric Fields, Electric Pulses, Rocks, Seismology, Signal Measurement, Surges, Ground Stations, Mathematical Models, Polarization (Charge Separation), Signal Detection

Scientific paper

Transient variations of the electric field are detected, prior to the failure of a rock sample which is subjected to uniaxial compression at a variable rate. These precursory electric signals are attributed to the stress induced polarization of the sample and seem to have a form similar to the so called Seismic Electric Signals (SES), which are detected in Greece by the VAN network, prior to earthquakes. The emitted electric signals seem to follow in form the variations of the first time derivative of the externally applied stress. A tentative model for the origin of these signals is also discussed.

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