eigencrust

geophysical inversion workspace

Gravity, magnetic, full tensor gradiometry and magnetization vector inversion in your browser. No installation required. Inversions run on cloud GPUs, with support for meshes of millions of cells.

Interpretive inversion; magnetic inverse models are non-unique. Vertical exaggeration 1.8×.

Mount Adams, Washington: 14,007 aeromagnetic stations over a 23 by 24 km block with 2.8 km of relief. The terrain mesh is 11,011,000 cells, 7,852,473 of them active, at 90 × 90 × 54 m. The full-station inversion converged in a combined 2 minutes 54 seconds. Both flight blocks, acquired at different heights, were fitted together.

Capabilities

Gravity
gx, gy, gz, and the full gradient tensor gxx through gzz, from the exact closed-form prism solution.
Magnetics
Thirteen components: TMI, its three gradients, bx, by, bz, and the full magnetic gradient tensor bxx through bzz. Cross-checked against SimPEG.
Full tensor gradiometry
Real SQUID gradiometer data, with all six channels inverted together.
Magnetization vector inversion
A free vector per cell, on any of those thirteen components. It resolves reversed polarity, which a scalar susceptibility inversion can only absorb as negative susceptibility. It works on TMI near the magnetic equator, without reduction to the pole.
Meshes
Built around the survey, with graded padding and cells cut to a digital elevation model.
Joint survey blocks
Survey blocks flown at different heights over the same ground can be fitted together on one mesh. Gravity and magnetics can share a terrain mesh.
Import and export
In: CSV, and UBC-GIF GRAV3D and MAG3D observation files. Out: mesh and model in UBC-GIF, cell-centre CSV, or NumPy.

The workspace

Diagonal 3D view of the recovered Bushveld density model and gravity survey with clear easting, northing, and elevation axes.
Recovered density and the 4,127-station Bushveld gravity survey it was fitted to, shown in an oblique 3D view with coordinate axes after trimming the mesh padding. Each result is linked to the survey, mesh and settings used for the inversion.

Contact

Get in touch to discuss your survey or ask a question.