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| Titel |
Experience of short term earthquake precursors with VLF–VHF electromagnetic emissions |
| VerfasserIn |
K. Eftaxias, P. Kapiris, J. Polygiannakis, A. Peratzakis, J. Kopanas, G. Antonopoulos, D. Rigas |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 3, no. 3/4 ; Nr. 3, no. 3/4, S.217-228 |
| Datensatznummer |
250000680
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| Publikation (Nr.) |
 copernicus.org/nhess-3-217-2003.pdf |
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| Zusammenfassung |
| Electromagnetic
anomalies (EMA) covering a wide range of frequencies from ULF, VLF up to
VHF have been observed before recent destructive earthquakes in
continental Greece. We show that the features of these signals are
possibly correlated with the fault model characteristics of the associated
earthquake and with the degree of geotectonic heterogeneity within the
focal zone. The time evolution of these electromagnetic sequences reveals
striking similarities to that observed in laboratory acoustic and
electromagnetic emissions during different stages of failure preparation
process in rocks. If we consider that the same dynamics governs the
large-scale earthquakes and the microscopic scale sample rheological
structure, the results of this analysis suggest that the recorded EMA
might reflect the nucleation phase of the associated impending earthquake.
We focus on the rise of the statistical view of earthquakes. We find
electro-magnetic fingerprints of an underlying critical mechanism.
Finally, we conclude that it is useful to combine ULF and VLF-VHF field
measurements in an attempt to enhance the understanding of the physics
behind these observations and thus to improve the quality of earthquake
prediction. Further, the identification of an EMA as a seismogenic one
supports the characterization of a sequence of shocks as foreshocks at the
time they occur, further helping the earthquake prediction effort. |
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