EARTHQUAKE FOCAL DEPTHS AND CRUSTAL STRENGTH IN THE BAIKAL RIFT
N.A. Radziminovich, S.O. Balyshev, and V.A. Golubev
Institute of the Earth's Crust, Siberian Branch of the RAS, 128 ul. Lermontova, Irkutsk, 664033, Russia
Keywords: Baikal rift, focal depths, crustal strength, brittle-ductile transition
Pages: 1175-1183
Abstract
Earthquakes are an important source of knowledge on mode of deformation and strength of rocks. According to the available hypocenter locations and recent relocations, most of seismicity in the Baikal rift is confined to the upper 26-27 km of the crust. The base of seismogenic crust corresponds to transition from brittle failure to plastic flow. The 0-27 km depth range of brittle failure in rifts is consistent with mostly mafic crust, high pore pressure, and an
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