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| | Abstract | | A three-dimensional inversion of MT data based on the simulated annealing was investigated. In this method, the ground was divided into assemblage of rectangular cells and each conductivity was inverted from apparent resistivities and phases. The 3D forward modeling scheme developed by Fomenko and Mogi 2002, was used to compute apparent resistivities and phases in the inversion. Optimization was performed by minimizing a cost function with smoothness constraint. Applying this method to 3D structure models, the freedom of inversion is much greater and it leads to instability of solution. In order to stabilize the solution of 3D inversion, we introduced supplementary algorithm based on evaluation of sensitivities to each cell. In this paper, we report the outline of this method and the result of inversion applying this method to MT data measured at the Teshio area, Hokkaido. |
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