The Characteristics of Magnetotelluric Responses for anisotropic conductivity

摘要

In this paper, we assume a 2D earth structure with anisotropic conductivity. One of the principal anisotropy axes is parallel to the striking direction and another axes is perpendicular to the surface of structure layer. By solving the variational problem with assigned boundary condition, we can compute the apparent resistivity for magnetotelluric (MT). Based on the forward modeling of MT field, we will analysis the difference of EM field for isotropic and anisotropic medium for TE_(Z )polarization model. Our study shows that the MT field can be significantly affected by anisotropic medium and should be taken into consideration in many geophysical applications. We also analyzed the effect of anisotropic parameter (ration of horizontal conductivity to vertical conductivity) and dipping layer on MT field.