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| Titel |
Stress induced polarization currents and electromagnetic emission from rocks and ionic crystals, accompanying their deformation |
| VerfasserIn |
V. Hadjicontis, C. Mavromatou, D. Ninos |
| 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 ; 4, no. 5/6 ; Nr. 4, no. 5/6 (2004-10-18), S.633-639 |
| Datensatznummer |
250001378
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| Publikation (Nr.) |
 copernicus.org/nhess-4-633-2004.pdf |
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| Zusammenfassung |
| A crucial question of the scientific community nowadays,
concerns the existence of electric signals preceding earthquakes. In order
to give a plausible answer to this question, we carried out two kinds of
laboratory experiments of uniaxial deformation of ionic crystals and rock
samples: a) In the first kind, stress induced polarization currents are
detected and recorded. Our experimental results showed not only the
existence of stress induced polarization currents before the fracture of the
samples, but the possibility of the propagation of these signals, as well,
through conductive channels, for distances much longer than the source
dimensions. b) In the second, acoustic and electromagnetic signals are
detected and recorded in the frequency range from 1KHz to some MHz. The
mechanism of generation of these signals is shown to be different for those
emitted from piezoelectric and from non-piezoelectric materials.
A plausible model is also suggested, on the compatibility of our laboratory
results with the processes occurring in the earth during the earthquake
preparatory stage. |
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