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Russian Geology and Geophysics

2007 year, number 4

LATE QUATERNARY AND RECENT DEFORMATION IN THE WESTERN TUNKA SYSTEM OF BASINS: STRUCTURAL, GEOMORPHIC, AND SEISMOLOGICAL EVIDENCE

A.V. Arzhannikova, V.I. Mel'nikova, and N.A. Radziminovich
Keywords: Structural geomorphology, earthquake mechanisms, deformation style, southwestern flank of the Baikal Rift Zone
Pages: 305-341

Abstract

Integrated seismological, structural, and geomorphic studies of the western Tunka system of rift basins show that the historic seismicity reflects the general Late Quaternary evolution trend of structures. Crustal deformation occurs mainly as shear with compression. Compression follows the boundaries of blocks and the mountainous northern periphery of basins, whereas extension acts upon their inner parts, which remain in