Multi-parameter migration imaging of magnetotelluric data using finite difference method

Based on systematic study of EM imaging techniques, this paper summarizes t he achievements carried out by former researches and points out the limitat ions of simple model tests. The paper puts forward the migration imaging te chnique of magnetotelluric data by introducing an improved finite differenc e method and using the experience of Zhdanov for reference, which increases the accuracy of the difference equation and the imaging resolution by pres erving the first order derivative of wave number in horizontal direction. M oreover, the paper also makes further researches on selecting of the suitab le conductivity background by adopting the rapid approximate inversion resu lt, joint imaging of two polarizaed modes, multi-parameters and second proc ess imaging. Based on the results of the synthetic and the real field obser ved MT data, the provided multi-parameter migration imaging technique has b een tested as a more accurate and effective measures for MT data imaging, e specially for the study of complicated geological problems.