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| Titel |
On the puzzling feature of the silence of precursory electromagnetic emissions |
| VerfasserIn |
K. Eftaxias, S. M. Potirakis, T. Chelidze |
| 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 ; 13, no. 9 ; Nr. 13, no. 9 (2013-09-27), S.2381-2397 |
| Datensatznummer |
250085522
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| Publikation (Nr.) |
 copernicus.org/nhess-13-2381-2013.pdf |
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| Zusammenfassung |
| It has been suggested that fracture-induced MHz–kHz electromagnetic
emissions (EME), which emerge from a few days up to a few hours before the
main seismic shock occurrence permit a real-time monitoring of the damage
process during the last stages of earthquake preparation, as it happens at
the laboratory scale. Despite fairly abundant evidence, electromagnetic (EM)
precursors have not been adequately accepted as credible physical phenomena.
These negative views are enhanced by the fact that certain "puzzling
features" are repetitively observed in candidate fracture-induced
pre-seismic EME. More precisely, EM silence in all frequency bands appears
before the main seismic shock occurrence, as well as during the aftershock
period. Actually, the view that "acceptance of "precursive" EM signals
without convincing co-seismic signals should not be expected" seems to be
reasonable. In this work we focus on this point. We examine whether the
aforementioned features of EM silence are really puzzling ones or, instead,
reflect well-documented characteristic features of the fracture process, in
terms of universal structural patterns of the fracture process, recent
laboratory experiments, numerical and theoretical studies of fracture
dynamics, critical phenomena, percolation theory, and micromechanics of
granular materials. Our analysis shows that these features should not be
considered puzzling. |
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