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DEPTH STRUCTURE FEATURES OF THE EASTERN STANOVOY FRAGMENT OF THE 8-DV GEOLOGICALGEOPHYSICAL SURVEY – BASE LINE (ACCORDING TO THE DSS DATA)

V. M. Soloviev 1, A. S. Salnikov 2, V. S. Seleznev 3, T. V. Kashubina 4, N. A. Galyova 1

1 Altay-Sayan Branch of Federal Research Center “Geophysical Survey of RAS”, Novosibirsk, Russia; 2 Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia; 3 Seismological Branch of “Geophysical Survey of RAS”, Novosibirsk, Russia; 4 A.P.Karpinsky Russian Geological Research Institute, Saint-Petersburg, Russia

The materials of deep seismic operations on the Vostochno-Stanovoy fragment of the survey base geophysical profile 8-DV within large tectonic zones – the Selengino-Stanovoy and Amur fold regions of the Central Asian fold belt are presented. It is shown that longitudinal waves from the boundaries in the earth’s crust and the surface of Mohorovichich were recorded from explosions on a 700-kilometer geophysical profile. An inhomogeneous structure was established according to the data of longitudinal waves of the upper part of the earth’s crust to depths of 15–20 km and the surface of Mohorovichich. In general, the thickness of the earth’s crust at the profile is 37–42 km; the effective velocities of longitudinal waves in the crust and refractor ones along the mantle surface change at the profile, respectively, from 6.35 to 6.5 km/s and from 7.9 to 8.5 km/s. The results obtained are discussed and established features of the seismic structure are compared with the tectonics of the region and materials from other studies.

Keywords: depth-sounding profile, P-wave velocity, deep seismic cross section, the earth’s crust, Mohoboundary, Selengino-Stanovaya folded region, Amur folded region.

DOI 10.20403/2078-0575-2020-4-29-39