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Static Deformation Due To Non-Uniform Slip Along A Very Long Vertical Strike-Slip Geological Fault in Two-Phase Medium

Shamta Chugh, Dinesh Kumar Madan, Kuldip Singh

Abstract


The static deformation is useful to investigate geological fault movements and related stress distribution. To investigate the effect of structural discontinuity on the elastic field, it is instructive to find analytical solution of the problem of a long fault in a model consisting of two homogenous half-space in welded contact. Closed-form analytical expressions for the deformation at any point of a two-phase medium consisting of a homogenous orthotropic elastic half-space in welded contact with a homogenous isotropic elastic half-space caused by non-uniform (parabolic, linear, cubic and elliptic slips) slip along a very long vertical strike-slip dislocation, situated in the orthotropic elastic half-space, are obtained. The variation of the surface displacement for different ratios of rigidities with the horizontal distance from fault for each slip profile have been shown graphically. It is found that a change in the ratio of rigidities of two different half-spaces changes the deformation field significantly. Numerical computations indicate that the deformation due to non-uniform slips differs significantly in each type of coupling. Contour maps showing the displacement field around the vertical strike-slip fault lying in an orthotropic elastic medium over an isotropic elastic medium for different slip profiles in each type of coupling are presented. It has been found that the displacement field in phases of two different media is significantly influenced by the nature of its coupling to a base and also by the different behaviour of slip profiles along a very long strike-slip fault.

Keywords


Strike-slip fault, Non-uniform slip, Half-spaces

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