Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 2.883 IF 2.883
  • IF 5-year value: 3.321 IF 5-year
    3.321
  • CiteScore value: 3.07 CiteScore
    3.07
  • SNIP value: 1.336 SNIP 1.336
  • IPP value: 2.80 IPP 2.80
  • SJR value: 1.024 SJR 1.024
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 81 Scimago H
    index 81
  • h5-index value: 43 h5-index 43
Volume 7, issue 5
Nat. Hazards Earth Syst. Sci., 7, 599–606, 2007
https://doi.org/10.5194/nhess-7-599-2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: Seismo-tectonic electromagnetic effects and precursory...

Nat. Hazards Earth Syst. Sci., 7, 599–606, 2007
https://doi.org/10.5194/nhess-7-599-2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  19 Oct 2007

19 Oct 2007

Time-scale invariances in preseismic electromagnetic radiation, magnetization and damage evolution of rocks

Y. Kawada1,2, H. Nagahama1, and N. Nakamura1 Y. Kawada et al.
  • 1Department of Geoenvironmental Sciences, Graduate School of Science, Tohoku University, Sendai, Japan
  • 2School of GeoSciences, University of Edinburgh, Edinburgh, UK

Abstract. 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.

Publications Copernicus
Download
Citation