Using the ASVI to invert for remanently magnetised bodies

John Paine; Mike Haederle; Marcus Flis

doi:10.1071/ASEG2001ab100

ISSN: 2202-0586
E-ISSN:

oa Using the ASVI to invert for remanently magnetised bodies
Authors John Paine^a, Mike Haederle^b and Marcus Flis^c
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^a Scientific Computing & Appl, , Australia, [email protected] ^b RioTinto Exploration, , Australia, [email protected] ^c Hammersley Iron Pty Ltd, , Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2001, Issue ASEG2001 - 15th Geophysical Conference, Dec 2001, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2001ab100
- Published online: 01 Dec 2001

Abstract

Magnetic inversion programs such as mag3d from UBC have proven to be very useful for generating realistic 3D susceptibility models from surface Total Magnetic Intensity (TMI) data.

However, these programs do not perform well when the observed data includes the response of bodies which are strongly remanently magnetised. This failure occurs because the forward model algorithm used in the inversion only generates the induced response, so the remanent component in the TMI has to be modeled using the induced response for an unrealistic distribution of susceptibility.

In this paper we investigate the effectiveness of inverting the analytic signal of the vertical integral (ASVI) for synthetic and real TMI data using mag3d. For both data sets we find that the inversion of the ASVI data produces a model which is much more realistic than that obtained by inverting the original data.

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2001-12-01

2026-01-25

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References

MacLeod, I. N., Jones, K. and Dai, T. R, 1993, 3-D analytic signal in the interpretation of total magnetic field data at low magnetic latitudes, Australian Society Of Exploration Geophysicists, 24, 679-688.
Li, Y. and Oldenburg, D. W., 1996, 3-D inversion of magnetic data: Geophysics, 61, no. 02, 394-408.

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Article Type: Research Article

Keyword(s): 3D inversion; analytic signal; remanence

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oa Using the ASVI to invert for remanently magnetised bodies

Abstract

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