Summary and advances of magnetotelluric data imaging techniques
YU Peng, WANG Jia lin, WU Jian sheng(Laboratory of Marine Geology, Tongji University, Shanghai 200092, China)
Based on systematic study of EM imaging techniques, this paper first summarizes the achievements carried out by former researches and points out their limitation. Then, puts forward the migration imaging technique of magnetotelluric data by introducing an improved finite difference method using the experience of Zhdanov for reference, which increases the accuracy of the difference equation and the imaging resolution. Moreover, the paper also makes further researches such as the selecting of the suitable conductivity background, joint imaging of two polarized modes, multi parameters and second process imaging, the whole frequency band imaging and imaging versus inversion technique.