ULF Electromagnetic Precursors for an Earthquake at Biak, Indonesia on February 17, 1996
By Masashi Hayakawa, T. Itoh, K. Hattori, K. Yumoto. Fifteenth International Wrocław Symposium and Exhibition, Electromagnetic Compatibility 2000, 2000
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ULF electromagnetic emissions associated with a large earthquake occurred at Biak Island, Indonesia at 5h 59m UT on February 17, 1996 (magnitude (Mw) = 8.2 and depth = 20 km from USGS catalog), have been investigated on the basis of ULF magnetic observations at two stations, Biak and Darwin in Australia (about 1,200 km apart). Though a simple analysis of magnetic field intensity (horizontal and vertical magnetic field components) at both stations was found to be closely correlated with geomagnetic ΣΚp activity, a detailed analysis of the difference of H and Z components at the two stations, the polarization analysis (Z/H) and fractal analysis (frequency spectrum slope) at these two stations has yielded that the ULF emissions (in the frequency range from 5 mHz to 30 mHz) about 1.5-1.0 months before the quake are likely to be a precursory signature of the quake with its intensity on the order of 0.2-0.3 nT.
Subfields: Artificial Intelligence, Geophysics
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- ICE, the electric field experiment on DEMETER (2006, background): “…corresponding observations cover a wide range of frequencies with measurements gathered at ULF (Fraser-Smith et al., 1990; Molchanov et al., 1992; Hayakawa et al., 2000), ELF and VLF (Molchanov et al., 1993; Parrot, 1995; Singh et al., 2000, see also reviews by Molchanov et al., 1993; Hayakawa,…”