Interdisciplinary 3D potential field modelling of complex lithospheric structures by IGMAS+
Plonka, Christian
Poster
Englisch
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We introduce an approach for 3D joint interpretation of potential fields and its
derivatives under the condition of constraining data and information. The
interactive 3D gravity and magnetic application IGMAS (Interactive Gravity and
Magnetic Application System) has been around for more than 30 years, initially
developed on a mainframe and then transferred to the first DOS PCs, before it
was adapted to Linux in the ’90s and finally implemented as a cross-platform
Java application with GUI. Since 2019 IGMAS+ is maintained and developed in
the Helmholtz Centre Potsdam – GFZ German Research Centre by the staff of
Section 4.5 – Basin Modelling and ID2 – eScience Centre. The core of IGMAS+
applies an analytical solution of the volume integral for the gravity and magnetic
effect of a homogeneous body. It is based on the reduction of the three-folded integral to an integral over the bounding polyhedrons that are formed by
triangles. Later the algorithm has been extended to cover all elements of
the gravity tensor as well and the optimized storage enables fast leastsquares
inversion of densities and changes to the model geometry and this
flexibility makes geometry changes easy. Because of the triangular model
structure of model interfaces, IGMAS can handle complex structures (multi-
Z surfaces) like the overhangs of salt domes and variable densities due to
voxelization. To account for the curvature of the Earth, we use spherical
geometries. Therefore IGMAS+ is capable to handle models from big-scale
to regional and small-scale models (meters) used in Applied Geophysics.
Statistik:
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Subjects:
Potential field modellingComplex modelling
Visualization
Software development
e-docs::Geophysik