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are the modes of the internal gravity and tidal waves in the lower atmosphere. On the days under atmospheric precipitation, the spectral power of Ez increases by an order of magnitude. During the pre-earthquake period, when the diurnal Ez variation had an anomaly, the intensity of harmonics with T = 1.8, 2.2, and 3.8 h increased
by an order of magnitude or more in comparison with the Ez spectra in fine weather. Two additional spectral
bands with T = 0.6 and 1 h have appeared simultaneously.
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