SPECTRAL and FOCAL PARAMETERS of NORTHERN CAUCASUS EARTHQUAKES 
in 2016–2017

The source spectral and dynamic parameters for 39 earthquakes with KR=10.0–13.8 occurred in the North Caucasus for 2016–2017 are given. The parameters were determined from S-wave amplitude spectra. Records of four regional digital seismic stations («Anapa», «Kislovodsk», «Makhachkala» and «Sochi») located no more than 300 km from the sources were used. The values of the frequency-dependent quality factor Q(f) for the environment near these stations were obtained earlier. This is necessary to take into account the attenuation of S-wave energy in the Earth's crust and upper mantle in order to recalculate the station spectra into the source spectra. In 2016–2017, most of the studied earthquakes were located in the Eastern Caucasus. For the first time, for western zone earthquakes recorded by a network of stations (N=4–7), the SEISAN program was applied and satisfactory results were obtained when compared with the Crimean data for the Kerch-Kuban zone.