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| Titel |
Multifractal analysis for the ULF geomagnetic data during the 1993 Guam earthquake |
| VerfasserIn |
Y. Ida, M. Hayakawa, A. Adalev, K. Gotoh |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 12, no. 2 ; Nr. 12, no. 2 (2005-01-31), S.157-162 |
| Datensatznummer |
250010478
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| Publikation (Nr.) |
 copernicus.org/npg-12-157-2005.pdf |
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| Zusammenfassung |
| In our previous papers we have shown that the fractal (monofractal)
dimension (Do) showed a significant increase before the Guam earthquake
occurred on 8 August, 1993. In order to have a further support to this
precursory effect to the general rupture (earthquake) we have carried out
the corresponding multifractal analysis (by means of detrended fluctuation
analysis) for the same data to study the statistical self-similar properties
in a wide range of scales. We have analyzed the ULF geomagnetic data (the
most intense H component) observed at Guam observatory. As the result, we
have found that we could observe significant changes in the multifractal
parameters at Guam such that αmin showed a meaningful decrease
about 25 days before the earthquake and correspondingly Δα
increased because αmax exhibited no significant change at all.
The most sensitive parameter seems to be non-uniformity factor Δ.
Correspondingly, the generalized multifractal dimension Dq (q>1) showed a
significant decrease (whereas Dq (q<0) showed no change) and D0 (=Dq (q=0) (as already found in our previous papers) is reconfirmed to increase
before the earthquake. These multifractal characteristics seem to be a
further support that these changes are closely associated with the
earthquake as a precursor to the Guam earthquake, providing us with
appreciable information on the pre-rupture evolution of the earthquake. |
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