Airborne Electromagnetic Systems

James Macnae

doi:10.1071/ASEG2007ab082

ISSN: 2202-0586
E-ISSN:

oa Airborne Electromagnetic Systems
Authors James Macnae^a
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^a RMIT University, , GPO Box 2476V Melbourne, 3001, Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2007, Issue ASEG2007 - 19th Geophysical Conference, Dec 2007, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2007ab082
- Published online: 01 Dec 2007

Abstract

Summary

AEM systems are essential tools for a wide range of mineral exploration and geological or environmental mapping applications. The product of peak dipole moment and the Liu waveform factor provides a quantitative estimate of the effective signal strength of a TEM system at a specific base frequency, and can be used to “compare” systems. Given also the noise levels of an AEM system and its frequency or time sampling, it is easy to predict the capabilities and resolution of the system.

The most challenging development required of AEM is the development of systems operating at 5 Hz or less to penetrate conductive cover and assist in the discrimination of very conductive copper/nickel sulphide deposits. Altimeter errors provide the main limitations in depth resolution of shallow environmental targets. 2D and 3D imaging and inversion strategies are not yet reliable or fast enough for routine application.

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References

Liu, G. 1998, Effect of transmitter current waveform on airborne TEM response, Explroation Geophsyics 29, 35-41.
Macnae, J., 2007, Developmetns in broadband airborne electromagnetics in the past decade, in Milkereit, B. (ed), Exploration in the new millennium, Proceedings of Exploration 07, Toronto.
Raiche, A., 2001, Choosing an AEM system to look for kimberlites – a modelling study: Exploration Geophysics, 32, 001-008.

/content/journals/10.1071/ASEG2007ab082

Article Type: Research Article

Keyword(s): Airborne Electromagnetic comparison

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