Abstract
Abstract. Very recently the recordings of precursory seismic electric signals (SESsf) in the island of Kozu-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.
Highlights
They led to an exponent of 0.330, which falls in the Draisncguessions(for a single signal) to a few months
Geophysical Research Letto answer the question of dersen et al, 1997; Sornette, 2000; Rundle et al, 2000)D
In Greece a SES activity was Hydrology(Doalongdlou, 2008a, b, 2009, 2010, 2012aH) syhdowroedloagn yina- ndrecorded in a station located in northern Greece
Summary
Before and after the occurrence of the earthquake) and the SES lead time found by Dologlou (2009, 2010, 2012a, b) is preserved when these new data are introduced. 22), we in the north-eastern Greece (39.2–41◦ N, 22.5–26◦ E) It is recalculate the power law by considering, instead of the last worth noting that during these 16 yr no large earthquake event no. 15 each (M ≥ 5.5) occurred in the above area except the Mw = 5.7 time, and we compare the derived values with the previously event on 8 January 2013 at 14:16:08 UTC with epicentre at computed one
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