STRESSED STATE OF THE MEDIUM IN THE LITHOSPHERE OF THE BAIKAL RIFT ZONE BASED ON THE DATA OF SEISMIC MOMENTS OF LARGE EARTHQUAKES

Abstract

Investigation of the spatial structure of the stressed state of the medium in the lithosphere of the Baikal Rift System (BRS) at the hierarchy level of large earthquakes (11 ≤ Kê ≤ 14) showed that a riftogenesis regime with shock-related dip-slip faulting (hereafter, normal faulting) exists in the region at the realization probability PN ≥ 0.5, while local regions of increased probability of strike-slip faulting and reverse faulting (P ≥ 0.25) determine the zones of the nonuniform deformed state of the medium. The analysis of the dynamics of stresses in the lithosphere of the region confirms the dominating role of riftogenesis in seismotectonic processes. However, this dominant is not stable and approximate equality and even short-period domination of strike-slip faulting and reverse faulting were recorded at the end of the 1980s and beginning of the 1990s.