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| | Abstract | | We have conducted 2D numerical analysis simultaneously for both onshore and offshore MT data. Our 2D numerical method comprises two parts, FEM forward modeling and nonlinear least square inversion with the ABIC smoothness constraint. The forward modeling part has been modified to enable the computation of the response of the seafloor MT station. First, the accuracy and reliability of the numerical method have been verified by comparison of the results obtained by forward modeling of 2D FEM with those obtained by forward modeling of the 3D integral equation and inversion of synthetic data for the coastal model. Then, we have applied 2D inversion to the MT data set that was obtained by both onshore and offshore measurements performed at the Horonobe coastal area, Hokkaido. The results of numerical experiments demonstrate that 2D modeling and inversion can be applied to the interpretation of coastal MT data. The inversion results obtained for the Horonobe MT data set can be used to estimate the 2D geoelectrical structure of Horonobe coastal area. |
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