Electromagnetic radiations associated with major earthquakes

Details Electromagnetic radiations associated with major earthquakes Electromagnetic radiations associated with major earthquakes

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pepi..105..249t&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 105, Issue 3-4, p. 249-259.

Physics

Scientific paper

Measurements of subsurface electric field changes have been conducted by means of borehole antennas. Changes in the number of pulse-like signals in a VLF band (seismic radio wave signals: SRS) evolved in close accordance with the occurrence of the earthquakes. The propagation of the long distance more than 500 km indicates the occurrence of waveguide mode propagation between the ionosphere and the ground. The time evolution of the number of the pulses indicates that there are two in the SRS: one emitted directly from the epicentral area and the other, coming induced by nonlinear interaction in the ionosphere, indirectly. These results indicate that the phenomena may be used to predict the time, location and magnitude of imminent earthquakes. Moreover, prominent electromagnetic field changes are observed just at the time of the great earthquake providing clear evidence that the fault motion is accompanied by electromagnetic radiation.

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