emg3d: A multigrid solver for 3D electromagnetic diffusion
Dieter Werthmüller (TU Delft - Civil Engineering & Geosciences)
Wim Mulder (Shell Global Solutions International B.V., TU Delft - Civil Engineering & Geosciences)
Evert Slob (TU Delft - Civil Engineering & Geosciences)
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Abstract
Controlled-source electromagnetic (CSEM) surveys are a common geophysical investigationtool in the search for, amongst other, groundwater, hydrocarbons, and minerals. The nu-merical modelling of CSEM data requires the solution of the Maxwell equations. These canbe simplified in the particular case of CSEM, as the frequencies used in surveys are usuallysufficiently low to ignore any displacement currents. A diffusive problem remains, which hasthe resulting system of equations given in the frequency domain byE
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