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The physical mechanism of seismic electric signals

Varotsos P., Hadjicontis V., Nowick A.

Acta Geophysica Polonica

2001

Vol. 49, nr 4

415-421

Seismic Electric Signals are low frequency (< 0.1 Hz) transient electrical variations that precede earthquakes, with a lead-time ranging from several hours to a few weeks. In order to better analyze and interpret these signals, it is important to understand the physical mechanism that gives rise to them. The present paper is aimed at that objective. Specifically, we claim that the deformation-induced charge flow phenomenon, discovered more than 40 years ago, could provide the explanation for various aspects of these signals.