Journal cover Journal topic
Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.699 IF 1.699
  • IF 5-year value: 1.559 IF 5-year
    1.559
  • CiteScore value: 1.61 CiteScore
    1.61
  • SNIP value: 0.884 SNIP 0.884
  • IPP value: 1.49 IPP 1.49
  • SJR value: 0.648 SJR 0.648
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 52 Scimago H
    index 52
  • h5-index value: 21 h5-index 21
Volume 14, issue 2
Nonlin. Processes Geophys., 14, 123–130, 2007
https://doi.org/10.5194/npg-14-123-2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: New developments in scaling, scale and nonlinearity in the...

Nonlin. Processes Geophys., 14, 123–130, 2007
https://doi.org/10.5194/npg-14-123-2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  19 Mar 2007

19 Mar 2007

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

Y. Kawada1, H. Nagahama1, Y. Omori1, Y. Yasuoka2, T. Ishikawa3, S. Tokonami3, and M. Shinogi2 Y. Kawada et al.
  • 1Department of Geoenvironmental Sciences, Graduate School of Science, Tohoku University, Sendai, Japan
  • 2Institute of Radioisotope Research, Kobe Pharmaceutical University, Kobe, Japan
  • 3National Institute of Radiological Sciences, Chiba, Japan

Abstract. 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.

Publications Copernicus
Download
Citation