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| Titel |
Recent seismic activity at Cephalonia island (Greece): a study through candidate electromagnetic precursors in terms of nonlinear dynamics |
| VerfasserIn |
S. M. Potirakis, Y. Contoyiannis, N. S. Melis, J. Kopanas, G. Antonopoulos, G. Balasis, C. Kontoes, C. Nomicos, K. Eftaxias |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2198-5634
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics Discussions ; 2, no. 6 ; Nr. 2, no. 6 (2015-12-04), S.1587-1629 |
| Datensatznummer |
250115202
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| Publikation (Nr.) |
 copernicus.org/npgd-2-1587-2015.pdf |
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| Zusammenfassung |
| The preparation process of two recent earthquakes (EQs) occurred in
Cephalonia (Kefalonia) island, Greece, (38.22° N,
20.53° E), 26 January 2014, Mw =6.0,
depth =21 km, and (38.25° N,
20.39° E), 3 February 2014, Mw =5.9,
depth =10 km, respectively, is studied in terms of the
critical dynamics revealed in observables of the involved non-linear
processes. Specifically, we show, by means of the method of critical
fluctuations (MCF), that signatures of critical, as well as
tricritical, dynamics were embedded in the fracture-induced
electromagnetic emissions (EME) recorded by two stations in
locations near the epicenters of these two EQs. It is worth noting
that both, the MHz EME recorded by the telemetric stations on the
island of Cephalonia and the neighboring island of Zante
(Zakynthos), reached simultaneously critical condition a few days
before the occurrence of each earthquake. The critical
characteristics embedded in the EME signals were further verified
using the natural time (NT) method. Moreover, we show, in terms of
the NT method, that the foreshock seismic activity also presented
critical characteristics before each one of these
events. Importantly, the revealed critical process seems to be
focused on the area corresponding to the west Cephalonia zone,
following the seismotectonic and hazard zoning of the Ionian Islands
area near Cephalonia. |
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