Numerical Modelling of Formation of Chuya-Kuray Fault Zone, Gorni Altai

Numerical modeling of fault zone evolution can elucidate the process of formation of a complicated fault system. Here we develop a numerical model of stress-strain state evolution in and around the Chuya-Kuray fault zone of Gorni Altay, Russia, to understand the fault zone evolution. The model’s structure is constructed on the basis of seismotectonic and paleoseismological studies as well as high-resolution Space-Radar-Topography-Mission data. A mathematical model is described by a set of partial differential equations of solid mechanics. Constitutive equations for inelastic strains were derived earlier and are implemented in this work. Inelastic behavior is described by the modified Drucker-Prager plasticity model with non-associated plastic flow rule. An initial stress state of the model is a result of gravity forces, and the model is activated by a slip of a buried dextral strike-slip fault located in the basement of the model. The results of modelling illustrate the stages of fault development, the development of fault brunches and the structure of the modeled fault zone.