IGMAS+ is a software combining 3-D forward and inverse modeling, interactive visualization and interdisciplinary interpretation of potential fields and their applications under geophysical and geological data constrains.

The software has a long history starting 1988 and has seen continuous improvement since then with input by many contributors. Since 2019, IGMAS+ is maintained and developed at The Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences by the staff of Section 4.5 – Basin Modelling and Section 5.2 – eScience Centre with strong ongoing support by H.-J. Götze and S. Schmidt from CAU Kiel.

The official webpage of IGMAS+ is available at https://www.gfz-potsdam.de/igmas.

Each major version of IGMAS+ is assigned with a DOI. Intermediate releases including changelog can be found at https://git.gfz-potsdam.de/igmas/igmas-releases/-/releases/. This is a collection DOI referring to all versions of IGMAS+. Links to each published version are redundantly available via the "Files" section and the Related Work section ("includes").

In IGMAS+, the analytical solution of the volume integral for the gravity and magnetic effects of a homogeneous body relies on reducing the three-folded integral to an integral over the bounding polyhedrons (in IGMAS+, polyhedrons are constructed using triangles). The algorithm encompass all elements of the gravity and magnetic tensors. Optimized storage facilitates extremely fast inversion of material parameters and changes to the model geometry. This flexibility simplifies handling geometry changes, as the model geometry is promptly updated, and the field components are recalculated after each modification.

The additional ability to invert for the geometry of the individual body interface extends the inverse modelling capabilities. Thanks to its triangular model structure, IGMAS+ effectively manages complex structures, such as the overhangs of salt domes. The software accommodates remanent and induced magnetization of geological bodies and finds application in interpreting borehole gravity and magnetics.

The modeling process is guided by constrains from independent data sources, such as structural information, geological maps and seismic data, and is crucial for the genuine integration of 3D thermal modeling and/or full waveform inversion results. IGMAS+ is largely used in the creation of 3-D data-constrained subsurface structural density and susceptibility models at different spatial scales. Both large-scale models (thousands of square km) and regional (hundreds of square km), are important for understanding the drivers of geohazards. In this case IGMAS+ is versatile, capable of handling both flat (regional) and spherical models (global, when it is necessary to consider the curvature of the Earth) in 3D. Medium-scale models support studies on the usage of the subsurface as thermal, electrical or material storage in the context of energy transition. Small-scale (tens of square km) models are largely used in applied geophysics, typically in sub-salt and sub-basalt settings.