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PECULIARITIES OF THE TRANSBAIKAL SEISMIC STRUCTURE AT THE SITE OF THE BASE LINE 1-SB VOSTOCHNY ON DATA OF DIFFERENTLY POLARIZED P- AND S-WAVES

V. M. Solovyev 1, N. A. Galyova 1, A. S. Salnikov 2, V. S. Seleznev 3, A. V. Liseykin 3, T. V. Kashubina 4, D. V. Vyatkina 4

1 Geophysical Survey of Russian Academy of Sciences, Novosibirsk, Russia; 2 Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia; 3 Altai-Sayan Regional Seismological Center, Geophysical Service SB RAS, Novosibirsk, Russia; 4 A. P. Karpinsky Russian Geological Research Institute, Saint Petersburg, Russia

Results of deep seismic studies of the P- and S-wave data on the 1,200-km base geophysical line 1-SB Vostochny in Transbaikal are presented. Deep seismic sections showing distribution of longitudinal and transverse velocities in the Earth’s crust and on the Moho are constructed. The M boundary is located at depths of 40–48 km, the boundary velocity of P-waves varies greatly along it and is 7.9–8.5 km/s. According to S-wave data, it is 4.6–4.9 km/s. The velocities of the P- and S-waves in the Earth’s crust are 6.4–6.5 and 3.65–3.75 km/s, respectively. An inhomogeneous structure of the upper Earth’s crust down to depths of 15–20 km has been established by the P- and S-velocity relationship and Poisson’s ratio. The correlations identified earlier on the 3-DV line have been confirmed by the confinement of a number of ore deposits to zones of reduced P-and S-velocity relationships and Poisson’s ratios in the upper Earth’s crust.

Keywords: DSS line, longitudinal and transverse waves, Р- and S-velocities, velocity relationships, deep seismic section, Earth’s crust, Moho boundary, minerogenetic zone.

DOI 10.20403/2078-0575-2019-3-57-71