Anisotropic magnetic susceptibility (AMS), as an intrinsic property, has been used widely in geological studies based on direct sample measurements. However, its application through geophysical data interpretations is rare despite its influence on the induced magnetization has been noted for decades. We present a theoretical study to examine the feasibility of directly recovering AMS from geomagnetic data and its potential use in geology differentiation to distinguish between different geological units. Using a 2D synthetic data consisting of a sequence of dipping layers with varying AMS that emulate a sedimentary scenario, and through a generalized inversion to recover the laterally varying magnetic susceptibility, we demonstrate that total-field magnetic anomaly produced by an AMS model cannot be reproduced by a purely isotropic susceptibility model. Allowing the flexibility of anisotropy, and enforcing a coherency in the anisotropy parameter space using a fuzzy c-means clustering, we show that the total-field anomaly data may contain sufficient information to resolve the presence of AMS. The recovered AMS values can be used to differentiate between different units based on the anisotropy degree.
Presentation Date: Tuesday, October 13, 2020
Session Start Time: 8:30 AM
Presentation Time: 11:00 AM
Location: 362C
Presentation Type: Oral
