Abstract
This article continues research of the seismic wave propagation parameters in the North Caucasus. The Q factors of the crust and upper mantle in the vicinity of Makhachkala are obtained, which are compared with the previously obtained Q factors in the vicinity of Sochi, Anapa, and Kislovodsk. According to records of regional (with epicentral distances up to ~300 km) earthquakes (MW ~ 3.9–5.6) acquired by the Makhachkala seismic station, estimates are obtained for the Q factor of the medium Q (f) in the form Q (f) ≈ f0.98 (envelope method) and Q (f) ≈ 135f0.72 (by coda normalization method); the generalized estimate has the form Q (f) ≈ 120 f0.8 (at frequencies up to ~ 16 Hz). The obtained Q factors in the vicinity of Makhachkala at low frequencies are slightly higher than the estimates obtained for regions of the Northwest Caucasus: the environs of Sochi, Anapa, and Kislovodsk (Q0 ~ 55–90; n ~ 0.7–1.0). The obtained Q factor estimates are planned to be checked and, possibly, refined by stochastic modeling of local earthquake records.
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REFERENCES
Aki, K., Attenuation of shear-waves in the lithosphere for frequencies from 0.05 to 25 Hz, Phys. Earth Planet. Inter., 1980, vol. 21, no. 1, pp. 50–60.
Aki, K. and Chouet, B., Origin of the coda waves: Source attenuation and scattering effects, J. Geophys. Res., 1975, vol. 80, no. 23, pp. 3322–3342.
Arshad, M.A., Crustal attenuation characteristics of S-waves beneath the Eastern Tohoku region, Jpn. Earthquake Sci., 2016, vol. 29, no. 5, pp. 259–269.
Boore, D.M., Simulation of ground motion using the stochastic method, Pure Appl. Geophys., 2003, vol. 160, pp. 635–676.
Chen, K.C., Shin, T.C., and Wang, J.H., Estimates of coda Q in Taiwan, Proc. Geol. Soc. China, 1989, vol. 32, pp. 339–353.
Giampiccolo, E., Tuve, T., Gresta, S., and Patane, D., S-waves attenuation and separation of scattering and intrinsic absorption of seismic energy in southeastern Sicily (Italy), Geophys. J. Int., 2006, vol. 165, pp. 211–222.
Herraiz, M. and Espinosa, A.F., Coda waves: A review, Pure Appl. Geophys., 1987, vol. 125, no. 4, pp. 499–577.
Kromskii, S.D., Pavlenko, O.V., and Gabsatarova, I.P., Features of radiation and propagation of seismic waves in the Northern Caucasus: Manifestations in regional coda, Izv.,Phys. Solid Earth, 2018, vol. 54, no. 2, pp. 222–232.
Nakamura, Y., Seismic energy transmission in an intensely scattering environment, J. Geophys., 1977. V. 43, pp. 389–399.
Pavlenko, O.V., Characteristics of seismic wave attenuation in the crust and upper mantle of the Northern Caucasus, Izv.,Phys. Solid Earth, 2008, vol. 44, no. 6, pp. 487–494.
Pavlenko, O.V., The Q-factor estimates for the crust and upper mantle in the vicinity of Sochi and Anapa (North Caucasus), Izv.,Phys. Solid Earth, 2016, vol. 52, no. 3, pp. 353–363.
Pavlenko, O. and Kozlovskaya, E., Characteristics of radiation and propagation of seismic waves in the Northern Finland estimated based on records of local earthquakes, Pure Appl. Geophys., 2018, vol. 175, no. 12, pp. 4197–4223.
Pavlenko, V.A. and Pavlenko, O.V., The seismic wave absorption in the crust and upper mantle in the vicinity of the Kislovodsk seismic station, Izv.,Phys. Solid Earth, 2016, vol. 52, no. 4, pp. 492–502.
Petukhin, A., Irikura, K., Ohmi, S., and Kagawa, T., Estimation of Q-values in the seismogenic and aseismic layers in the Kinki Region, Japan, by elimination of the geometrical spreading effect using ray approximation, Bull. Seismol. Soc. Am., 2003, vol. 93, no. 4, pp. 1498–1515.
Rautian, T.G., Khalturin, V.I., Zakirov, M.S., Zemtsova, A.G., and Proskurin, A.P., Eksperimental’nye issledovaniya seismicheskoi kody (Experimental Studies of Seismic Coda), Moscow: Nauka, 1981.
Tsujiura, M., Spectral analysis of the coda waves from local earthquakes, Bull. Earthquake Res. Inst.,Tokyo Univ., 1978, vol. 53, pp. 1–48.
Wesley, J.P., Diffusion of seismic energy in the near range, J. Geophys. Res., 1965, vol. 70, no. 20, pp. 5099–5106.
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The study was carried under the state task of IPE RAS no. 0144-2019-0011.
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Kirsanov, V.I., Pavlenko, O.V. Quality Estimates of the Crust and Upper Mantle of the Northeast Caucasus Based on to Makhachkala Seismic Station Records. Seism. Instr. 56, 61–71 (2020). https://doi.org/10.3103/S0747923920010077
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DOI: https://doi.org/10.3103/S0747923920010077