Multifractal Analysis for the ULF Geomagnetic Data during the Guam Earthquake
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概要
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In our previous papers we have shown that the fractal (monofractal) dimension (Do) showed a significant increase before the Guam earthquake occurred on August 8, 1993. In order to have a further support to this precursory effect, 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. αmin showed a meaningful decrease about 25 days before the earthquake, but αmax exhibited no significant change at all, so that Δα showed a significant increase before the earthquake. 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.
- 2006-04-01
著者
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HAYAKAWA Masashi
Department of Physics, Nagoya University
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Ida Yu-ichi
Department Of Electronic Engineering The University Of Electro-communications
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GOTOH Kaoru
National Institute of Information and Communications Technology (NICT)
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Hayakawa Masashi
Department Of Electronic Engineering The University Of Electro-communications
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Gotoh Kaoru
National Institute Of Information And Communications Technology
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Hayakawa Masashi
Department Of Electronic Engineering And Research Station On Seismo Electromagnetics The University Of Electro-communications
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