Time-scale invariant changes in atmospheric radon concentration and crustal strain prior to a large earthquake

Y. Kawada, H. Nagahama, Y. Omori, Y. Yasuoka, T. Ishikawa, S. Tokonami, M. Shinogi

研究成果: Article査読

28 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)123-130
ページ数8
ジャーナルNonlinear Processes in Geophysics
14
2
DOI
出版ステータスPublished - 2007

ASJC Scopus subject areas

  • 統計物理学および非線形物理学
  • 地球物理学
  • 地球化学および岩石学

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