This project was started by Dieter Werthmüller at TUD as part of the Gitaro.JIM project (see below). Dieter would like to thank his past and current employers who allowed and allow him to maintain and further develop the code after the initial funding ended, namely:
- 2018-2021: Delft University of Technology; through the Gitaro.JIM project (till 05/2021, emg3d v1.0.0), funded by MarTERA as part of Horizon 2020, a funding scheme of the European Research Area.
- 2021-2022: TERRASYS Geophysics GmbH & Co. KG.
- 2021-2024: Delft University of Technology through the Delphi Consortium.
- 2024-today: ETH Zurich through the group Geothermal Energy and Geofluids.
For a list of code contributors see https://github.com/emsig/emg3d/graphs/contributors.
There are various contributors who improved emg3d not through code commits but through discussions and help on Slack at SWUNG and at SimPEG, thanks to both communities. Special thanks to @jokva (general), @banesullivan (visualization), @joferkington (interpolation), @jcapriot (volume averaging), and @sgkang (inversion).
The core of emg3d is a complete rewrite and redesign of the multigrid code by
Wim A. Mulder ([Muld06]_, [Muld07]_, [Muld08]_, [MuWS08]_), developed at
Shell and at TU Delft. Various authors contributed to the original code,
amongst others, Tom Jönsthövel ([JoOM06]_; improved solver for strongly
stretched grids), Marwan Wirianto ([WiMS10]_, [WiMS11]_; computation of
time-domain data), and Evert C. Slob ([SlHM10]_; analytical solutions). The
original code was written in Matlab, where the most time- and memory-consuming
parts were sped up through mex-files (written in C). It included multigrid with
or without BiCGSTAB, VTI resistivity, semicoarsening, and line relaxation; the
number of cells had to be powers of two, and coarsening was done only until the
first dimension was at two cells. As such it corresponded roughly to emg3d
v0.3.0.
See the References section in the manual for the full citations and a more extensive list.