Electromagnetic ELF radiation from earthquake regions as observed by low-altitude satellites

Details Electromagnetic ELF radiation from earthquake regions as observed by low-altitude satellites Electromagnetic ELF radiation from earthquake regions as observed by low-altitude satellites

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19...91s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, Jan. 24, 1992, p. 91-94.

Other

34

Cosmos Satellites, Earthquakes, Electromagnetic Radiation, Extremely Low Frequencies, Satellite Observation, Seismic Waves, Remote Sensing, Spectral Signatures, Wave Propagation

Scientific paper

Seismoelectromagnetic waves observed by low-altitude satellites passing over seismic regions were studied. The data of the Cosmos-1809 satellite were analyzed over an earthquake region. Intense EM radiation at frequencies below 450 Hz was observed at the L-shells of the earthquake, during 12 orbits out of the 13 that passed within 6 deg in longitude from the epicenter, and during 1 out of 6 in the range of 6-8 deg longitude away from this region. The other orbits, which passed 10-12 deg from the epicenter, showed no effect. The emissions observed by another low-altitude satellite are used to complete the study. It is shown that during the event the seismic region is permanently radiating; the intensity and the envelope shape of the wave depend on its time relatively to the time of the earthquake. Their frequency spectra are compared to the average spectrum recorded in the same geomagnetic regions. Similar wave intensities and spectral distributions were observed on the two satellites during the seismic periods.

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