SPECTRAL and FOCAL PARAMETERS of NORTHERN CAUCASUSEARTHQUAKES

Author:

Malyanova L.1,Gabsatarova Irina1ORCID

Affiliation:

1. Geophysical Survey of the Russian Academy of Sciences

Abstract

Dynamic sources parameters of 21 earthquakes of the North Caucasus for 2014 with КР=9.5–11.5, determined from 44 S-wave amplitude spectra are analyzed. Records of three regional digital seismic stations, “Anapa”, “Kislovodsk” and “Sochi”, located no more than 300 km from the sources are used. For the environment near these stations, the values of the frequency-dependent Q-factor, necessary for recalculating the station spectra to the focal ones, were obtained earlier by O.V. Pavlenko. In 2014, the majority of earthquakes studied were located in the Eastern Caucasus. The dependence between log M0 and КР for this zone was constructed using the data for 2010–2013. Compared to the similar equation for the entire Caucasus (Riznichenko et all., 1976), this dependence is in a good agreement with respect to the free term, but differs by the slope.

Publisher

Geophysical Survey of the Russian Academy of Sciences - GS RAS

Reference17 articles.

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2. Pavlenko, O.V. (2016). [Characteristics of radiation and propagation of seismic waves in the Northern Caucasus estimated from records at seismic stations “Sochi” and “Anapa,”].Voprosy inzhenernoy seysmologii [Seismic Instruments],43(1), 49–61. (In Russ.).

3. Pavlenko, O.V. (2009). The study of the radiation characteristics and propagation of seismic waves in the North Caucasus by modeling the accelerograms of the recorded earthquakes. Izvestiya, Physics of the Solid Earth, 45(10), 874.

4. Solov'yova, O.N., Agalarova, E.B., Alimamedova, V.P., Gasanov, A.G., Geodakyan, E.G., Gyul', E.K., Darakhvelidze, L.K., Petrosyan, M.D., Fabritsius, Z.E., &Khrometskaya, Ye.A. (1983).[CalibrationfunctionsfordeterminingthemagnitudeofCaucasianearthquakesbytheshort-periodwavePatsmallepicentraldistances]. In Interpretatsiia seismicheskikh nabliudenii [Interpretation of seismic observations] (pp. 65–72). Moscow, Russia: MGC at the Presidium of the Academy of Sciences of the USSR Publ.(In Russ.).

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