10.1. Comprehensive Workflows: TMI Magnetics

Author: Devin C. Cowan

Published: February, 2022

Requires GIFtools v3.0 or later

Here, we present a general workflow for loading, interpreting, processing and inverting total magnetic intensity (TMI) magnetic data. We begin with TMI data in a basic XYZ format. Our goal is to process and invert the TMI data to recover a 3D magnetic susceptibility model for a local survey area. For this tutorial, we have both local and regional datasets; the later of which can be used to constrain the local-scale inversion if available. You may work with the tutorial datasets provided or use your own data:

We would like to thank Glencore , and especially Daryl Ball, for providing the local survey data used to create this comprehensive workflow. The regional-scale data were queried from the Natural Resources Canada Geoscience Data Repository for Geophysical Data .

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Regional and local TMI anomaly data (above). Local susceptibility models recovered with inversion using various norms (bottom).

Tutorial Sections