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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 10, issue 4 | Copyright
Nat. Hazards Earth Syst. Sci., 10, 901-906, 2010
https://doi.org/10.5194/nhess-10-901-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  23 Apr 2010

23 Apr 2010

Fractal analysis of subionospheric LF propagation data and consideration of the lithosphere-atmosphere-ionosphere coupling

T. Imamura1,2, Y. Ida1,2, Y. Kasahara1,2, T. Nakamura1,2, Y. Hobara1,2, and M. Hayakawa2,3 T. Imamura et al.
  • 1Department of Electronic Engineering, The University of Electro – Communications (UEC), 1-5-1 Chofugaoka, Chofu Tokyo, 182-8585, Japan
  • 2Research Station on Seismo Electromagnetics, UEC, Tokyo, Japan
  • 3Advanced Wireless Communications Research Station, UEC, Tokyo, Japan

Abstract. Fractal analysis has been applied to the local nighttime data of subionospheric LF propagation, and the fractal dimension is estimated every day in the two distinct frequency ranges (AW: acoustic wave and AGW: atmospheric gravity wave). The data during several years are analyzed for the propagation paths from the Japanese transmitter of JJY to Moshiri (Hokkaido) and to Kochi. As the result of analysis, we come to the conclusion that when we pay attention to the period just around the earthquake, we sometimes detect some significant increases in the fractal dimension either in AW or AGW range. This indicates that the self – organization effect prior to an earthquake in the lithosphere, might be seen even in the lower ionosphere, probably in terms of atmospheric oscillation effect.

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