Application of different signal analysis methods to the ULF data for the 1993 Guam earthquake

Y. Ida (1) , M. Hayakawa (1) , S. Timashev (2)

1 Department of Electronic Engineering and Research Station on Seismo Electromagnetics
2 Karpov Institute of Physical Chemistry

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.

Domaines: Interfaces continentales, environnement; Océan, Atmosphère; Sciences de la Terre

Y. Ida, M. Hayakawa, S. Timashev. Application of different signal analysis methods to the ULF data for the 1993 Guam earthquake. Natural Hazards and Earth System Sciences, 2007, 7 (4), pp.479-484. ⟨hal-00299442⟩