Transient electric signals prior to rock failure under uniaxial compression

Published on Aug 1, 1994in Geophysical Research Letters4.497
· DOI :10.1029/94GL00694
V. Hadjicontis9
Estimated H-index: 9
(UoA: National and Kapodistrian University of Athens),
C. Mavromatou1
Estimated H-index: 1
(UoA: National and Kapodistrian University of Athens)
Sources
Abstract
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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Varotsos, P. and Lazaridou, M., 1991. Latest aspects of earthquake prediction in Greece based on seismic electric signals, Tectonophysics, 188: 321-347. Since 1983, continuous monitoring of the electrotelluric field has been carried out using an array of measuring stations located at various sites in Greece. The basic physical properties of the transient changes-seismic electric signals (SES)-in the electrotelluric field that are forerunners of earthquakes were first described six years ago. Sin...
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