Correlation between GEOS VLF emissions and earthquakes

Details Correlation between GEOS VLF emissions and earthquakes Correlation between GEOS VLF emissions and earthquakes

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985angeo...3..737p&link_type=abstract

Annales Geophysicae (ISSN 0755-0685), vol. 3, Nov.-Dec. 1985, p. 737-747.

Physics

9

Earthquakes, Radio Emission, Satellite Observation, Statistical Analysis, Very Low Frequencies, Earth Magnetosphere, Geos Satellites (Esa), Statistical Correlation

Scientific paper

Increases in the VLF emission intensity have been observed on the GEOS-1 (apogee: 38000 km, perigee: 2050 km) and GEOS-2 (geostationary) satellites at the moment of earthquakes. The phenomenon is detected both on the electric and magnetic antennas, in the frequency range 0.3-10 kHz. A statistical study has been performed using measurements of the geostationary satellite (GEOS-2). From August 1978 to June 1982, 296 earthquakes of magnitude M approximately 5 have been observed at longitudes close to the satelite longitude (20 deg E + or - 30 deg), during periods of time when the VLF experiment was on. Clear increases have been pointed out in 51 percent of the cases. The longitude and time dependence of the events, plus the frequency variations, seem to indicate that there is an association (possibly indirect) between the seismic activity and some VLF emissions observed on satellites.

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