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Time-scale Invariant Changes in Atmospheric Radon Concentration and Crustal Strain Prior to a Large Earthquake : Volume 14, Issue 2 (19/03/2007)

By Kawada, Y.

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Book Id: WPLBN0004019810
Format Type: PDF Article :
File Size: Pages 8
Reproduction Date: 2015

Title: Time-scale Invariant Changes in Atmospheric Radon Concentration and Crustal Strain Prior to a Large Earthquake : Volume 14, Issue 2 (19/03/2007)  
Author: Kawada, Y.
Volume: Vol. 14, Issue 2
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Yasuoka, Y., Omori, Y., Ishikawa, T., Nagahama, H., Kawada, Y., Tokonami, S., & Shinogi, M. (2007). Time-scale Invariant Changes in Atmospheric Radon Concentration and Crustal Strain Prior to a Large Earthquake : Volume 14, Issue 2 (19/03/2007). Retrieved from

Description: Department of Geoenvironmental Sciences, Graduate School of Science, Tohoku University, Sendai, Japan. 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.

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

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