Upward Continuation of Aeromagnetic Profiles

J. P. Williams

doi:10.1071/EG988383

ISSN: 0812-3985
E-ISSN: 1834-7533

Upward Continuation of Aeromagnetic Profiles
Authors J. P. Williams^a
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^a Geology Department Queensland Institute of Technology, G.P.O. Box 2434, Brisbane, QLD, 4001, Australia
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 19, Issue 1-2, Mar 1988, p. 383 - 390
DOI: https://doi.org/10.1071/EG988383
- Published online: 01 Mar 1988

Abstract

Upward continuation is normally carried out by convolving grid operators with the data. Continuation height is restricted to units of data intervals and much information is lost around the boundaries.

Continuation can be carried out in the frequency domain in which case no information is lost around the edges and continuation height is not restricted.

In the case of aeromagnetic surveying where high density data are normally collected along flight lines 10 or 20 data units apart, it is desirable to use a one dimensional operator. This avoids interpolation problems, but assumes infinite strike. This paper describes the results of model and field tests designed to investigate the limitations of one dimensional upward continuation in the frequency domain.

The field tests show that in practice, the technique is less restrictive than indicated by model tests. For routine surveys one dimensional continuation is acceptable.

The model tests show that depth to bottom of source is important and a body may have an infinite response at one level but a finite one at another. This casts doubts on the need for drape flying.

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1988-03-01

2026-01-19

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References

Bhattacharyya, B. K. (1965)—‘Two Dimensional Harmonic Analysis as a Tool for Magnetic Interpretation’, Geophysics30, 829–857.
Blakely, R. J. and Grauch, V. J. S. (1983)—‘Magnetic Models of Crystalline Terrain: Accounting for the Effect of Topography’, Geophysics48, 1551–1557.
Cordell, L. (1985)—‘Techniques, Applications and Problems of Analytical Continuation of New Mexico Aeromagnetic Data between Arbitrary Surfaces of Very High Relief’, in Potential Fields in Rugged Topography, Lausanne, 96–101.
Grauch, V. J. S. and Campbell, D. L. (1984)—‘Does Draping Aero-magnetic Data Reduce Terrain Induced Effects’, Geophysics49, 75–80.
Hill, C. M. (1985)—‘Geology of the Cinnabar-Five Mile Creek Area Kilkivan, South East Queensland’, Project Report, unpubl., Dept. of App. Geol. Q.l.T.
Peters, L. J. (1949)—‘The Direct Approach to Magnetic Interpretation and its Practical Application’ Geophysics14, 290–319.
Shuey, R. T. and Pasquale, A. T. (1973)—‘End Corrections in Magnetic Profile Analysis’, Geophysics38.
Tsay, L. J. (1975)—‘The Use of Fourier Series Method in Upward Continuation with New Improvements’, Geophys.Prosp. 23, 28–41.
Tsay, L. J. (1978)—‘A Spatial Analysis of Upward Continuation of Potential Field Data’, Geophys. Prosp. 26, 822–840.
Williams, J. P. (1987)—‘Upward Continuation of Total Magnetic Intensity Profiles’, M.App.Sc. thesis (unpubl.) Dept. of App. Geol. Q.l.T.

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Article Type: Research Article

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Upward Continuation of Aeromagnetic Profiles

Abstract

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