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emsig are open-source codes to simulate electromagnetic data. Their main targets are geophysical applications (exploration and monitoring, engineering, environmental), but they are by no means limited to that. Currently there are two main codes, empymod and emg3d . The former is a 3D code for layered media, the latter is a low-memory multigrid solver for 3D media. Both are written in Python and released under the permissive Apache-2.0 license .
3D EM modeller for 1D VTI media