Modeling of 3‐D Electromagnetic Responses in Frequency domain by Using the Staggeredgrid Finite Difference Method

Abstract

AbstractThree dimensional modeling of electromagnetic fields is essential in understanding the responses of the electromagnetic fields in the earth. Although various numerical modeling techniques have been developed, there are still much to do for the practical use. In this study, the staggered‐grid finite difference method is used to simulate the three dimensional electromagnetic responses. It is suitable for the magnetic dipole in any direction. The calcuation results are compared with that obtained from analytic solution, integral equation and other means. It is shown that the staggered grid finite difference method combined with the Bi‐conjugate gradient iterative solver processed with divergence correction and incomplete Cholesky decomposition procedures can efficiently improve the three dimensional electromagnetic calculation with high accuracy and stability.