Abstract
The spectral parameters of the sources of 38 earthquakes in the North Caucasus were determined from the displacement spectra of S-waves for the period 2020. The calculations used events with an energy classes KR=9.3–12.9 and waveforms from stations with epicentral distances 50–250 km. The values of local magnitudes ML were calculated using a new calibration curve. The calculation of source spectra was carried out in the SEISAN program based on the frequency-dependent quality factor Q(f). The following values were obtained: 0 – spectral density, f0 – corner frequency, M0 – scalar seismic moment, Mw – moment magnitude, – stress drop, and RMS for each of the parameters. For 30 earthquakes with KR=9.0–12.9 focal mechanisms were calculated, which are represented by reverse faults (including reverse faults with strike-slip components – 73 %), normal faults – 20 % and strike-slip – 7 %, which corresponds to deformation processes in the collision zone of the Arabian and Eurasian plates.
Published Version
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