Investigation of the seismicity after the initiation of a Seismic Electric Signal activity until the main shock

TL;DR

This study analyzes seismic activity following Seismic Electric Signal detection leading up to a main shock, using natural time analysis to identify characteristic changes before earthquakes, exemplified by 2008 Greece events.

Contribution

It introduces the application of natural time variance analysis to seismic electric signals for predicting main shocks.

Findings

Variance $ppa_1$ shows distinct features before main shocks

Seismic electric signals correlate with seismicity patterns

Potential for improved earthquake prediction methods

Abstract

The behavior of seismicity in the area candidate to suffer a main shock is investigated after the observation of the Seismic Electric Signal activity until the impending mainshock. This makes use of the concept of natural time $\chi$ and reveals that the probability density function of the variance $\kappa_1(=< \chi^2 > -< \chi > ^2)$ exhibits distinct features before the occurrence of the mainshock. Examples are presented, which refer to magnitude class 6.0 earthquakes that occurred in Greece during the first two months in 2008.