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| | Abstract | | The finite difference method and the finite element method are often used as a numerical calculation of the electromagnetic field below the surface for the forward and inverse problem of the MT method. However, using the finite difference method has a difficulty of including complicated shape in the model like the topography and underground heterogeneous structure. For overcoming the weak point, the particle method attracts attention of MT users recently. The particle method is one of the techniques to make a model discretization with particles not aligned along lattice or mesh. In this study, we performed examination about the better setting of the influence radius to achieve the high accuracy when we use the particle method for the analysis of the electromagnetic field in the MT method. In our numerical results, the trend is obvious that the calculation error at high frequency was small enough if the influential radius was small. We also found that a relation between the degree of the electric field attenuation and the influential radius which can adjust the calculation error to be smaller. |
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