References

NPG

Nonlinear Processes in Geophysics

NPG

Nonlin. Processes Geophys.

1607-7946

Copernicus Publications

Göttingen, Germany

10.5194/npg-20-411-2013

Features of criticality in precursory seismic electric signals and earthquakes in Greece

Dologlou

Solid State Section, Department of Physics, University of Athens, Panepistimiopolis, Zografou, 157 84 Athens, Greece

21 06 2013

20 3 411 416

2013

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Very recently the recordings of precursory seismic electric signals (SESsf) in the island of K<span style="text-decoration: overline">o</span>zu-shima, Japan, have been reported, and their interrelation with subsequent earthquakes was shown to be beyond chance. Almost simultaneously, the recording of SES activity in northern Greece was also reported, which was followed by a magnitude 5.7 earthquake in northern Greece. These facts strengthen the aspects on the precursory nature of SESs and also enable the updating of a previously found power law relation between the earthquake stress drop and the lead time of SESs. They led to an exponent of 0.330, which falls in the range of critical exponents for fracture. The stability of this exponent, which results from a large amount of data during the last 30 yr, is remarkable and may thus confirm features of criticality in the pre-seismic region after the SES emission. The underlying physics are also discussed.

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