About 3D Structure of the Baikal Rift Upper Crust from DSS, Receiver Function and Local Earthquake Data

About 3D structure of the Baikal rift upper crust from DSS, receiver function and local earthquake data V.D. Suvorov (IPGG SB RAS, Novosibirsk), V.V. Mordvinova (IEC SB RAS, Irkutsk) G.I. Tat’kov, S.A. Tubanov (GIN SB RAS, Ulan-Ude) Connection between the crust structure and distribution of earthquake sources remains not clear yet. We show distribution of P- and S- wave velocities in the upper crust beneath central part of Baikal Lake according to the three methods together with earthquake focal depth distribution. The one-dimensional model of P-wave velocity from DSS data is initial. A seismic active layer with earthquake sources on the depth of 8-22 km is mapped and change trends of focal depth earthquakes are defined. Variations of P- and S-wave velocities are found out lengthways seismically active layer. It is revealed that S-wave velocity according to DSS and earthquakes data in the upper crust considerably is above, than from receiver function observations. At the same time that velocity is close to DSS data in the lower crust. Probably P-to-S converted waves in upper crust are formed near to surface only. This research is supported by the Integration Project of Russian AcadeУmy of Sciences № 6.17.