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Multifractal Analysis for the Ulf Geomagnetic Data During the 1993 Guam Earthquake : Volume 12, Issue 2 (31/01/2005)

By Ida, Y.

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Book Id: WPLBN0004019664
Format Type: PDF Article :
File Size: Pages 6
Reproduction Date: 2015

Title: Multifractal Analysis for the Ulf Geomagnetic Data During the 1993 Guam Earthquake : Volume 12, Issue 2 (31/01/2005)  
Author: Ida, Y.
Volume: Vol. 12, Issue 2
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Hayakawa, M., Gotoh, K., Adalev, A., & Ida, Y. (2005). Multifractal Analysis for the Ulf Geomagnetic Data During the 1993 Guam Earthquake : Volume 12, Issue 2 (31/01/2005). Retrieved from

Description: Department of Electronic Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu Tokyo 182-8585, Japan. 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.

Multifractal analysis for the ULF geomagnetic data during the 1993 Guam earthquake


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