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1 2002

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Seismic electric signals and seismicity: on a tentative interrelation between their spectral

Varotsos P., Sarlis N., Skordas E.

Acta Geophysica Polonica

2002

Vol. 50, nr 3

337-354

We show that the spectral content of the seismic activity, in the area candidate to suffer an earthquake and which evolves consecutively in time with every new event, falls on the spectral content of the Seismic Electric Signals (SES) activity, just before the occurrence of the main shock. The key point is that both spectra have to be defined and calculated in a new time domain, termed as "natura1" time. Thus, since the spectrum of the SES is known well in advance, the continuous inspection of the spectrum of the evolving seismic activity may lead to an estimation of the time window of the impending main shock with an accuracy of around a few days. Both spectra exhibit a feature compatible with that obtained from the theory of dynamic phase transitions (critical phenomena).