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| Titel |
Time-scale invariances in preseismic electromagnetic radiation, magnetization and damage evolution of rocks |
| VerfasserIn |
Y. Kawada, H. Nagahama, N. Nakamura |
| 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 ; 7, no. 5 ; Nr. 7, no. 5 (2007-10-19), S.599-606 |
| Datensatznummer |
250004734
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| Publikation (Nr.) |
 copernicus.org/nhess-7-599-2007.pdf |
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| Zusammenfassung |
| We investigate the time-scale invariant changes in electromagnetic and
mechanical energy releases prior to a rock failure or a large earthquake.
The energy release processes are caused by damage evolutions such as crack
propagation, motion of charged dislocation, area-enlargement of sheared
asperities and repetitive creep-rate changes. Damage mechanics can be used
to represent the time-scale invariant evolutions of both brittle and plastic
damages. Irreversible thermodynamics applied to the damage mechanics reveals
that the damage evolution produces the variations in charge, dipole and
electromagnetic signals in addition to mechanical energy release, and yields
the time-scale invariant patterns of Benioff electromagnetic radiation and
cumulative Benioff strain-release. The irreversible thermodynamic framework
of damage mechanics is also applicable to the seismo-magnetic effect, and
the time-scale invariance is recognized in the remanent magnetization change
associated with damage evolution prior to a rock failure. |
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