Abstract
The variability of F2-layer critical frequencies ( ƒ oF2 ) during the earthquakes of 1976 and 1984 in the Gazli region is analysed. Irrespective of the geomagnetic situation, the spectral density S of the deviations of the critical frequencies from the smooth diurnal trend proves to increase markedly, with periods of 1.5–2.5 h, a day before the earthquake. The values of S on the day of the earthquake are small for all periods. The effect found is observed at stations near the epicentre.
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