Experience of Modeling the Seismotectonic Flow of the Earth’s Crust in Central Asia
Аннотация
Abstract—Tectonic flow of crustal rock masses (a creep flow) in Central Asia is numerically modeled using the Stokes equations within a region limited by 36° and 46° N, 56° and 76° E. In the study, tectonic and seismotectonic flow of a rock mass is understood as a strain rate and its variation induced by an earthquake. The focal mechanism of an earthquake is modeled in two ways: by a lumped internal moment and by a double couple with no net torque. Three-dimensional continuum equations are averaged over the lithosphere’s thickness with the use of the properties of the geodynamic statement of the problem. The right-hand sides of the averaged creep flow equations contain tectonic stresses and present-day topography as the initial data. For their determination, the inverse problem of elasticity is solved. The possible boundary conditions providing the formation of the present-day surface topography of Central Asia by the interaction between the Indian, Arabian and Eurasian plates are sought. The obtained numerical results fairly well agree with the real GPS data.