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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 1, issue 1/2
Nat. Hazards Earth Syst. Sci., 1, 61–67, 2001
https://doi.org/10.5194/nhess-1-61-2001
© Author(s) 2001. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: Double Issue: Seismic hazard evaluation - Part I

Nat. Hazards Earth Syst. Sci., 1, 61–67, 2001
https://doi.org/10.5194/nhess-1-61-2001
© Author(s) 2001. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  30 Jun 2001

30 Jun 2001

Inductive seismo-electromagnetic effect in relation to seismogenic ULF emission

O. Molchanov1, A. Kulchitsky2,3, and M. Hayakawa2 O. Molchanov et al.
  • 1EORC, NASDA, Roppongi 1-9-9, Minato-ku, Tokyo 106-0032, Japan
  • 2University of Electro-Communications, Chofu 1–5–1, Tokyo 182-8585, Japan
  • 3Moscow Lomonosov State University, Vorobievy gory, 119899, Moscow, Russia

Abstract. During the seismic wave propagation through the crust, the electromagnetic pulse can originate due to MHD conversion in this conductive medium. On the assumption of simple models of seismic wave excitation and attenuation, the problem is reduced to the analysis of a diffusion-like equation for a vector potential function. In this way, we need to change the classical gauge condition. A semi-analytical form of the solution is obtained in a case with constant ground conductivity. Dependencies of the electric and magnetic field components and the pulse duration on distance and crust conductivity have been computed in detail. The results could be useful for the explanation of electromagnetic signals related to coseismic, foreshock and aftershock activity.

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