Geophysical Journal | 2005 volume 27 1

Mapping the fault-block crustal structure in modern tectonophysics

© Seminskiy K.Zh.

A method providing for tectonophysical mapping of the fault-block crustal structure is described; it is based on results of analyzing the spatial distribution of abundant fracturing. A first case study in a region of the central Baikal rift describes two stages of specialized mapping comprehensively, which contributes to ordinary geological mapping a great deal. Within the framework of the first stage, after three conjugated systems of fractures are identified for each basic rock outcrop, firstly, the territory is subdivided into blocks deformed under similar conditions; and, secondly, impact zones of faults are delineated, conditions of fault occurrence are revealed (wrench, compression, extension). At the second stage, based on a set of known techniques and methods of studying structural patterns and forms (shear elements, crushing zones, folds etc.), it is possible to obtain additional and more detailed data on mapped objects. Maps constructed by the proposed specialized mapping method can serve as a structural geological base for geodynamic compilations; they can also be used in applied studies related to engineering geological prospecting, potential seismic hazard assessments, prospecting in promising natural resource areas.

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