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| Titel |
Time-scale invariant changes in atmospheric radon concentration and crustal strain prior to a large earthquake |
| VerfasserIn |
Y. Kawada, H. Nagahama, Y. Omori, Y. Yasuoka, T. Ishikawa, S. Tokonami, M. Shinogi |
| 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 ; 14, no. 2 ; Nr. 14, no. 2 (2007-03-19), S.123-130 |
| Datensatznummer |
250012157
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| Publikation (Nr.) |
 copernicus.org/npg-14-123-2007.pdf |
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| Zusammenfassung |
| Prior to large earthquakes (e.g. 1995 Kobe earthquake, Japan), an increase
in the atmospheric radon concentration is observed, and this increase in the
rate follows a power-law of the time-to-earthquake (time-to-failure). This
phenomenon corresponds to the increase in the radon migration in crust and
the exhalation into atmosphere. An irreversible thermodynamic model
including time-scale invariance clarifies that the increases in the pressure
of the advecting radon and permeability (hydraulic conductivity) in the
crustal rocks are caused by the temporal changes in the power-law of the
crustal strain (or cumulative Benioff strain), which is associated with
damage evolution such as microcracking or changing porosity. As the result,
the radon flux and the atmospheric radon concentration can show a temporal
power-law increase. The concentration of atmospheric radon can be used as a
proxy for the seismic precursory processes associated with crustal dynamics. |
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