Method of imminent earthquake prediction by observation of elect

Details Method of imminent earthquake prediction by observation of elect Method of imminent earthquake prediction by observation of elect

1995-08-29

1997-12-02

Lobo, Ian J.

Communications: directive radio wave systems and devices (e.g.,

Transmission through media other than air or free space

324348, 340690, G01S 1388, G01V 312, G01V 338

Patent

active

056941293

ABSTRACT:
A seismic electromagnetic field signal is detected at each of observation stations installed at at least two places, and civil noise and atmospheric discharge noise are eliminated from the signal to obtain a low-frequency seismic electromagnetic field signal O.sub.s. A local characteristic signal C.sub.e and a refined local characteristic signal C.sub.f are obtained by processing the signal O.sub.s. The signals O.sub.s, C.sub.e and C.sub.f are transmitted to a central station. At the central station, a delay time T and a half-width H are obtained from the cross-correlation function between the observation stations, and further a regional characteristic signal C.sub.r is obtained from the seismic electromagnetic field signal O.sub.s. An earthquake source region distribution, an earthquake magnitude, and earthquake occurrence time are estimated on the basis of the signals obtained at the central station and the local characteristic signal C.sub.e and refined local characteristic signal C.sub.f obtained at each observation station.

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Fujinawa et al, "ULF Underground Electric Field VAriations as Imminent Precursors of Earthquakes," Earthquake Journal, vol. 43, pp. 287-290, Jun. 1990.
Takahashi et al, "Locating source regions of pre-cursory seismo-electric fields and the mechanism generating electric field variations," Phy. Earth Planet. Inter. (Neatherlands) vol. 77, No. 1-2, pp. 33-38, Apr. 1993.

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