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| Titel |
A comparison of different fractal analyses for VHF electromagnetic emissions and their self-organization for the off-sea Miyagi-prefecture earthquake |
| VerfasserIn |
N. Yonaiguchi, Y. Ida, M. Hayakawa, S. Masuda |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 7, no. 4 ; Nr. 7, no. 4 (2007-08-24), S.485-493 |
| Datensatznummer |
250004659
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| Publikation (Nr.) |
 copernicus.org/nhess-7-485-2007.pdf |
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| Zusammenfassung |
| 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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