Physics – Geophysics
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2797h&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 18, p. 2797-2800
Physics
Geophysics
33
Mathematical Geophysics: Fractals And Multifractals, Seismology: Seismic Hazard Assessment And Prediction, Radio Science: Signal Processing, Exploration Geophysics: Oceanic Structures
Scientific paper
This paper presents a fractal analysis of the ULF electromagnetic data obtained at Guam observatory during a strong (Ms=8.0) earthquake occurred on August 8, 1993 near the Guam island. We have already reported the presence of seismogenic ULF emissions for this quake (Hayakawa et al., GRL, 1996). The chosen period covered four months before and two months after the earthquake. It was found that the spectrum of emissions at noon exhibited a power law behavior f-β which is typical for self-organized critical dynamics. The slope of the spectrum in the noon sector fluctuates in a range from 2.5 to 0.7 with a tendency to gradually decrease during the process of the earthquake preparation. We consider this to be a candidate for a precursory signature. The similar effect was found for the night sector. We suggest that the focal zone was at the critical stage of self-organized criticality process before the quake, related to active microfracturing processes followed by the generation of ULF emissions as we detected.
Hayakawa Masashi
Ito Tetsuya
Smirnova Natalia
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