Abstract

Failure to adequately correct for the effects of self-demagnetization can lead to misinterpretation of magnetic survey data, thereby reducing the success of mineral exploration programs. Numeric methods commonly used to correct for self-demagnetization of finite three-dimensional bodies are restricted to moderate magnetic susceptibilities (χ < 1 SI) because at higher values (χ ≥ 1 SI), the approximation errors for nonellip-soidal bodies become excessive.

This paper reports a new method that allows for calculation of the magnetic field from arbitrary finite bodies with high magnetic susceptibility while minimizing approximation errors caused by the use of self-demagnetization corrections for nonellipsoidal bodies. This technique uses a segmented model defined by spherical elements (or voxels) of arbitrary diameter and an iterative computation of the magnetic field at the center of each voxel in free space and then with respect to the surrounding voxels.

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