Evaluation of Atmospheric Electric Field as Increasing Seismic Activity   Indicator on the example of Caucasus Region
  The present paper deals with reliability of a gradient of atmospheric electric field potential as an indicator of seismic activity increase. With this in view, records of atmospheric electric field potential gradients of Caucasus region for 1953-1992 with respect to periods before average and large earthquakes, which took place in the same time interval, were considered. It is worth to pay attention to the fact that the avalanche-like unstable model of fault formation based on theoretical model of self-generated seismo-electromagnetic oscillations of LAI system explains convincingly spectral succession of electromagnetic emission frequency of the periods preceding earthquakes. 
M. K. Kachakhidze, Z. A. Kereselidze, N. K. Kachakhidze
physics.geo-ph