What is it about?
A three-dimensional finite-difference time-domain transient electromagnetic forward modeling method with whole-space initial field is proposed to improve forward efficiency and flexibility. The open-source software WFTEM3D is developed based on this method with two language versions: a FORTRAN code and a MATLAB code. It is applicable to the tunnel model, the non-flat topography model, and the multi-scale model.
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Why is it important?
This method has three advantages. First, this method shows that the homogeneous whole-space initial field can be used to simulate the half-space model, that is, this method can be used to simulate both the whole-space model and the half-space model. Second, maybe because homogeneous whole-space initial field spatial variations are smoother near the ground surface than for the half-space case, big mesh growth factors (i.e. the ratio of adjacent grid sizes) of 1.5–3 are allowed, which significantly improves the computational efficiency and facilitates the simulation of the multi-scale model. Third, the approximate initial field can be calculated using a conductivity independent of the model, which facilitates the simulation of the non-flat topography model.
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This page is a summary of: 3D finite-difference transient electromagnetic modeling with whole-space initial field, Geophysics, January 2023, Society of Exploration Geophysicists, DOI: 10.1190/geo2021-0828.1.
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