Sub-Audio Magnetics (SAM) — A High Resolution Technique for Simultaneously Mapping Electrical and Magnetic Properties1

M.K. Cattach; S.J. Lee; J.M. Stanley; G.W. Boyd

doi:10.1071/EG993387

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

Sub-Audio Magnetics (SAM) — A High Resolution Technique for Simultaneously Mapping Electrical and Magnetic Properties¹
Authors M.K. Cattach^a, S.J. Lee^a, J.M. Stanley^a and G.W. Boyd^b
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^a Geophysical Research InstituteUniversity of New England, Armidale, , NSW, 2351, Australia ^b Normandy Poseidon Group, PO Box 7175 100 Hutt Street Adelaide, , SA, 5000, Australia
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 24, Issue 3-4, Sep 1993, p. 387 - 399
DOI: https://doi.org/10.1071/EG993387
- Published online: 01 Sep 1993

Abstract

A high definition technique has been developed for simultaneously mapping electrical and magnetic characteristics of the ground. Each of the parameters may be measured at sub-metre intervals while continuously traversing either on foot or in a vehicle. Electric current, typically in the frequency range of 5 Hz to 200 Hz is induced in the ground by either galvanic of electromagnetic means. An optically pumped total field magnetometer continuously measures the natural and synthetic field changes from DC to the highest transmitted frequency. Real-time spectral analysis of the magnetic field changes allows a suite of geophysical parameters to be derived.

The geophysical measurements so obtained include, but are not limited to:

• Total Field, High Definition Magnetics (HDM).

• Total Field, Magnetometric Resistivity (TFMMR).

• Total Field, Magnetometric Induced Polarisation (TFMMIP).

• Total Field, Electromagnetics (TFEM).

Because of its inherent cost-efficiency and superior spatial resolution, the SAM technique has the potential to significantly enhance geophysical mapping for mineral exploration, archaeological investigation and environmental studies of salinity, industrial waste and chemical contamination in soils.

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References

Edwards, R.N. (1974), ‘The Magnetometric Resistivity Method and its Application to the Mapping of a Fault’, Can. J. Earth Sci.11, 1136–1156.
Geophysical Technology Pty Ltd (1990), Technical Brief — Model TM-4 Magnetometer and Image Processing System.
Jakosky, J.J. (1940), Exploration Geophysics, Los Angeles Times-Mirror Press, 1195 pp.
Keller, G.V. and Frischknecht, F.C. (1966), Electrical Methods in Geophysical Prospecting, Pergamon Press, 519 pp.
Scintrex (1993), CS-2 Cesium Magnetometer (Technical Manual).
Seigel, H.O. (1974), ‘The Magnetic Induced Polarisation Method’, Geophysics39, 321–339.
Seigel, H.O. and Howland-Rose, A.W. (1990). ‘Magnetic Induced Polarisation Method’ in: Induced Polarisation — Applications and Case Studies, Investigations in Geophysics No. 4, Society of Exploration Geophysicists.
Stanley, J.M. and Cattach, M.K. (1990), ‘The Use of High Definition Mapping in Engineering Site Investigation’, Explor. Geophys.21, 91–103.
Stanley, J.M., Sertsrivanit, S. and Clark, P.J. (1992), ‘Magnetic Exploration Beneath a Near-Surface Magnetic Noise Source’, Explor. Geophys.23, 323–326.
Telford, W.M., Geldardt, L.P. and Sheriff, R.E. (1990), Applied Geophysics — Second Edition. Cambridge University Press, 860 pp.
Zonge Engineering and Research Organisation (1990), GGT-10 Manual.

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Article Type: Research Article

Keyword(s): environmental geophysics; geological mapping; HDM; high-definition; magnetometer; SAM; Sub-Audio Magnetics; TFMMIP; TFMMR

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Sub-Audio Magnetics (SAM) — A High Resolution Technique for Simultaneously Mapping Electrical and Magnetic Properties1

Abstract

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Sub-Audio Magnetics (SAM) — A High Resolution Technique for Simultaneously Mapping Electrical and Magnetic Properties¹