The Characteristics of Seismic Rotations in VTI Medium

Under the assumptions of linear elasticity and small deformation in traditional elastodynamics, anisotropy medium has a significant effect on rotations observed during earthquakes. Based basic theory first-order velocity-stress elastic wave equation, this paper simulates seismic propagation translational rotational motions two-dimensional isotropic VTI (transverse media with vertical axis symmetry) under different source mechanisms staggered-grid finite-difference method respect to nine seismological models. Through comparing similarities differences between components fields, focuses influence anisotropic parameters amplitude phase characteristics rotations. We verify that energy S waves is significantly stronger than P waves, response more sensitive. There abundant information high-frequency band components. With increase Thomsen ε δ, increases gradually, which means component observation may be helpful study parameters.