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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 7, issue 4
Nat. Hazards Earth Syst. Sci., 7, 485–493, 2007
https://doi.org/10.5194/nhess-7-485-2007
© 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, 485–493, 2007
https://doi.org/10.5194/nhess-7-485-2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  24 Aug 2007

24 Aug 2007

A comparison of different fractal analyses for VHF electromagnetic emissions and their self-organization for the off-sea Miyagi-prefecture earthquake

N. Yonaiguchi1, Y. Ida1, M. Hayakawa1, and S. Masuda2 N. Yonaiguchi et al.
  • 1The University of Electro-Communications, Department of Electronic Engineering and Research Station on Seismo Electromagnetics, 1-5-1 Chofugaoka, Chofu Tokyo 182-8585 Japan
  • 2Tohoku Intelligent Communications Co., Ltd., Sendai, Japan

Abstract. The VHF electromagnetic noise intensity data at several stations in the Tohoku area of Japan during the period of a rather large (with magnitude of 7.2) earthquake (Miyagi-ken oki earthquake) taken place on 16 August 2005, are analyzed by means of different fractal analysis methods, including (1) spectral slope estimation, (2) multi-fractal detrended fluctuation analysis and (3) multi-fractal wavelet transform modulus maxima method. It seems to the authors that there is no definite analysis method for the analysis of any seismogenic phenomenon, so that the only way we have to take, is to apply different methods to the same data for the detailed comparison of the results. This comparison enables us to deduce the properties commonly observed by the above methods. Because the most important feature common to these three methods, is that significant changes in fractal scaling characteristics are observed just during the earthquake (mainly before the earthquake) only at one station of Kunimi. Finally, we can come to the definite conclusion on the self-organization of VHF emissions only at one station in the present case.

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