Features of rupture formation in a rheologically heterogeneous sedimentary cover over active foundation faults: according to the results of physical modeling

Abstract

Physical modeling of the process of formation of the shear zone in single-layer and multilayer models of models is carried out in order to elucidate the features of fault formation in the rheologically heterogeneous sedimentary cover of the platform over the active fractures of the foundation. Model materials were montmorillonite clay water paste, wet sand and their composite. On the example of single-layer models, it is shown that the thickness of the deformable layer determines the width of the shear zone, the time of the onset of rupture formation in it and the duration of the implementation of the stages of its development, and its rheological properties determine the features of its internal discontinuous structure. The results of modeling on rheologically heterogeneous multilayer models showed that the width of the shear zone formed in them does not remain constant in vertical and is determined by the properties of the model material.