ESTIMATION OF INTERNAL ABSORPTION AND SCATTERING OF ELASTIC WAVES, THEIR CONTRIBUTION TO THE TOTAL ATTENUATION FOR THE TERRITORY OF THE CHUI-KURAI ZONE
V.V. Arapov1 *, A.A. Emanov1, 2, A.F. Emanov1, A.V. Fateev1, 2
1Altay-Sayan Branch of Geophysical Survey, Siberian Branch of the Russian Academy of Sciences, pr. Novosibirsk, Russia
2Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: seismic quality factor, intrinstic attenuation, scattering attenuation, earthquake, Qopen, Chui-Kurai zone, Altai mountains.
Abstract
The attenuation of seismic waves and its components in the Earth's crust of the Mountain Altai Chui-Kurai zone has been studied by the method of code envelope inversion [Sens-Schönfelder, Wegler, 2006]. The analysis used waveforms of earthquakes with a magnitude ML > 2.5, recorded by a network of stationary and temporary stations of the ASGSR RAS within the studied region. As a result, the contribution of Qi-1
absorption and Qsc-1 scattering to the overall Qt-1
attenuation of the main structures of the region was determined, and the spatial distribution of the Qt parameter, as well as the seismic albedo B0, was estimated. The dominance of the absorption contribution over scattering in the overall attenuation of seismic waves is shown. The obtained values of the seismic Q-factor parameter make it possible to carry out an accurate calculation of the moments of magnitudes and an assessment of the focal parameters of earthquakes, as well as more accurately calculate artificial accelerograms, etc.
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