Comparison of Magnetic and Gravity Terrain Models

J. P. Williams; V. J. S. Grauch

doi:10.1071/EG989201

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

Comparison of Magnetic and Gravity Terrain Models
Authors J. P. Williams^a and V. J. S. Grauch^b
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^a Department of Applied GeologyQueensland University of Technology, , G.P.O. Box 2434, Brisbane, , OLD, 4001 ^b U.S. Geological Survey, Box 25046, Federal Centre, MS 964 Denver, , Colorado, , 80225, , USA
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 20, Issue 1-2, Mar 1989, p. 201 - 204
DOI: https://doi.org/10.1071/EG989201
- Published online: 01 Mar 1989

Abstract

Modelling of magnetic terrain and comparison with actual data is an efficient method for assessing large sets when residual anomalies are important. The technique of Blakely (1981) which utilises a rapidly converging series of Fast Fourier Transforms is an efficient and sufficiently accurate method for this assessment.

The technique has been applied to a data set at Kilkivan, south eastern Queensland. Here the magnetic sources are near horizontal Triassic volcanic flows unconformably overlying a non- magnetic Palaeozoic basement.

Geological control is good so that it is possible to model the bottom of the flow. It is postulated that the difference between the calculated and actual data represents paleochannels in the basement. Similar techniques applied to gravity data have not been as successful.

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1989-03-01

2026-01-16

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References

Blakely, R. J. (1981), ‘A Program for Rapidly Computing the Magnetic Anomaly Over Digital Topography’, USGS, open file report, 81-298.
Grauch, V. J. S. and Campbell, D. L. (1984), ‘Does Draping Aeromagnetic Data Reduce Terrain Induced Effects’, Geophysics,49, 75-80.
Parker, R. L. (1972), ‘The Rapid Calculation of Potential Anomalies’, Geophys. J.R. Astr. Soc., 31, 447-455.
Williams, J. P. (1988), ‘Upward Continuation of Aeromagnetic Profiles’, Explor. Geophys., 19, 383-390.

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Article Type: Research Article

Keyword(s): gravity terrain; magnetic terrain; magnetic topography; modelling; palaeochannels

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Comparison of Magnetic and Gravity Terrain Models

Abstract

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