关键词: 二维大地电磁, 有限元法, 反演

Abstract: We have developed a new two-dimensional inversion method for magnetotelluric data inversion. This method is based on one-dimensional magnetotelluric curve comparison method with phase information, using resistivity and impedance phase data set from 1D inversion as the initial model, and then modeling with 2D finite element method(FEM). In successive iteration, model resitivity is modified by the 1D inversion procedure at depth and by 2D FEM in survey line. We can obtain a data set approximately approached real resitivity distribution after inversion process. The result shows that inversion process is feasible, and has the advantages of simplity, rapidity and avoiding the caculation of partial derivative matrix.

Key words: 2D MT, Finite element method, Inversion