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Application of Hilbert-like transforms for enhanced processing of full tensor magnetic gradient dataNormal access

Authors: M. Schiffler, M. Queitsch, R. Stolz, H.-G. Meyer and N. Kukowski
Journal name: Geophysical Prospecting
Issue: Vol 65, No S1, December 2017 pp. 68 - 81
DOI: 10.1111/1365-2478.12518
Organisations: Wiley
Language: English
Info: Article, PDF ( 16.7Mb )

Summary:
Commonly, geomagnetic prospection is performed via scalar magnetometers that measure values of the total magnetic intensity. Recent developments of superconducting quantum interference devices have led to their integration in full tensor magnetic gradiometry systems consisting of planar-type first-order gradiometers and magnetometers fabricated in thin-film technology. With these systems measuring directly the magnetic gradient tensor and field vector, a significantly higher magnetic and spatial resolution of the magnetic maps is yield than those produced via conventional magnetometers. In order to preserve the high data quality in this work, we develop a workflow containing all the necessary steps for generating the gradient tensor and field vector quantities from the raw measurement data up to their integration into high-resolution, low-noise, and artefactless two-dimensional maps of the magnetic field vector. The gradient tensor components are processed by superposition of the balanced gradiometer signals and rotation into an Earth-centred Earth-fixed coordinate frame. As the magnetometers have sensitivity lower than that of gradiometers and the total magnetic intensity is not directly recorded, we employ Hilbert-like transforms, e.g., integration of the gradient tensor components or the conversion of the total magnetic intensity derived by calibrated magnetometer readings to obtain these values. This can lead to a better interpretation of the measured magnetic anomalies of the Earth’s magnetic field that is possible from scalar total magnetic intensity measurements. Our conclusions are drawn from the application of these algorithms on a survey acquired in South Africa containing full tensor magnetic gradiometry data.

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