Abstract
AbstractBased on a systematic study of EM imaging techniques, this paper proposes a migration imaging technique of analysing magnetotelluric data using an improved finite difference method. The technique increases the accuracy of the finite difference equation and imaging resolution by preserving the first order derivative of wave number in the horizontal direction. Selection of the suitable conductivity background through adoption of the results of rapid approximate inversion, joint imaging of two polarized modes, multi‐parameters and second process imaging, are also discussed. Based on results of synthetic and real field observed MT data, the multi‐parameter migration imaging technique using the finite difference method is a more accurate and effective method for MT data imaging.
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