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Russian Geology and Geophysics

2006 year, number 5

SPECIFIC DYNAMICS OF INTERBLOCK DEFORMATION IN THE EARTH'S CRUST

G.G. Kocharyan, A.A. Kulyukin, and D.V. Pavlov
Institute for Dynamics of Geospheres, Russian Academy of Sciences,
38 Leninsky prosp., korp. 1, Moscow, 119334, Russia
Keywords: Fault, block structure, earthquake, afterslip, rheology
Pages: 667-681

Abstract

Results of laboratory experiments and observation data on postseismic deformations in different regions were used to detect the regularities of formation of slow relative block displacements provoked by dynamic events. It is shown that under a gradual change of the stress-strain state of a rock massif, the asymptotic form of displacement with time is close to the law of a quasi-static flow, and under a drastic change in deformation rate, the relative block displacements are controlled mainly by the laws of friction force change during shear. The results obtained show that the dynamics of forces resisting to shears along block boundaries must be taken into account when constructing geomechanical models of different scales.