NHESS Natural Hazards and Earth System Sciences NHESS Nat. Hazards Earth Syst. Sci. 1684-9981 Copernicus Publications Göttingen, Germany 10.5194/nhess-7-479-2007 Application of different signal analysis methods to the ULF data for the 1993 Guam earthquake Ida Y. 1 Hayakawa M. 1 Timashev S. 2 Department of Electronic Engineering and Research Station on Seismo Electromagnetics, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo, 182-8585, Japan Karpov Institute of Physical Chemistry, Moscow 103064, Russia 22 08 2007 7 4 479 484 Copyright: © 2007 Y. Ida et al. 2007 This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Generic License. To view a copy of this licence, visit https://creativecommons.org/licenses/by-nc-sa/2.5/ This article is available from https://nhess.copernicus.org/articles/7/479/2007/nhess-7-479-2007.html The full text article is available as a PDF file from https://nhess.copernicus.org/articles/7/479/2007/nhess-7-479-2007.pdf

Two different analysis methods; (1) mono-fractal analysis (based on Higuchi method) and (2) flicker noise spectroscopy, have been applied to the same ULF (frequency less than 10 Hz) electromagnetic data observed at Guam during 3 years including the 1993 August Guam earthquake. The results by these two methods are found to be very consistent with each other; that is, some precursory effects seem to start about 3 months before the earthquake. This gives us a strong support to the self-organizing critical process before the Guam earthquake.

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