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| Titel |
Current challenges for pre-earthquake electromagnetic emissions: shedding light from micro-scale plastic flow, granular packings, phase transitions and self-affinity notion of fracture process |
| VerfasserIn |
K. Eftaxias, S. M. Potirakis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 20, no. 5 ; Nr. 20, no. 5 (2013-10-17), S.771-792 |
| Datensatznummer |
250086055
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| Publikation (Nr.) |
 copernicus.org/npg-20-771-2013.pdf |
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| Zusammenfassung |
| Are there credible electromagnetic (EM) potential earthquake (EQ) precursors?
This a question debated in the scientific community and there may be
legitimate reasons for the critical views. The negative view concerning the
existence of EM potential precursors is enhanced by features that accompany
their observation which are considered as paradox ones, namely, these
signals: (i) are not observed at the time of EQs occurrence and during the
aftershock period, (ii) are not accompanied by large precursory strain
changes, (iii) are not accompanied by simultaneous geodetic or seismological
precursors and (iv) their traceability is considered problematic. In this
work, the detected candidate EM potential precursors are studied through a
shift in thinking towards the basic science findings relative to granular
packings, micron-scale plastic flow, interface depinning, fracture size
effects, concepts drawn from phase transitions, self-affine notion of
fracture and faulting process, universal features of fracture surfaces,
recent high quality laboratory studies, theoretical models and numerical
simulations. We try to contribute to the establishment of strict criteria for
the definition of an emerged EM anomaly as a possibly EQ-related one, and to
the explanation of potential precursory EM features which have been
considered as paradoxes. A three-stage model for EQ generation by means of
pre-EQ fracture-induced EM emissions is proposed. The claim that the observed
EM potential precursors may permit a real-time and step-by-step monitoring of
the EQ generation is tested. |
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