A search for seismic related wave activity in the micropulsation and ULF frequency ranges using GEOS-2 data

Physics

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Earthquakes, Extremely Low Radio Frequencies, Geomagnetic Micropulsations, Seismic Waves, Geos 2 Satellite, Mediterranean Sea, Satellite Observation

Scientific paper

Data from the GEOS-2 double probe electric field experiment were analyzed in an attempt to find correlations between the appearance of micropulsation noise bursts in the approximate period range 1-20 min and seismic activity. A similar analysis has been performed using GEOS electric field data in the ULF range (0.3 to 11 Hz). In our search, measurements from the geostationary satellite GEOS-2 made during the 3 months of January, March 6-April 5 and July 1979 were studied in a systematic fashion. Seismic activity within these three months was classified into three types, namely activity close to the footprint of the GEOS-2 field line, activity within about + or - 30 deg of the satellite longitude, and finally disturbances from explosions. A characteristic seismic related spectral feature was not found in the wave data and, after studying the GEOS-2 energetic particle data, it is concluded that all possible correlations could be explained as the result of chance coincidence. It is emphasized, however, that most earthquakes considered within these three months were of fairly low (M less than 5) magnitude. To extend the scope of our search, GEOS-2 data gathered during major earthquake events in Yugoslavia (April 15, 1979, M = 6.1) and southern Greece (February 24, 1981, M = 6.1) were then examined. The wave activity observed around the times of these events is intimately related to the concurrent high levels of geomagnetic activity and here, too, unambiguous identification of seismic related wave activity proved impossible.

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