Feasibility studies of TFMMIP and TFEM surveying with Sub-Audio Magnetics

D.B. Boggs; M.K. Cattach; J.M. Stanley

doi:10.1071/EG998290

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

Feasibility studies of TFMMIP and TFEM surveying with Sub-Audio Magnetics
Authors D.B. Boggs^a, M.K. Cattach^b and J.M. Stanley^c
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^a Geophysical Technology LimitedGeology and GeophysicsUniversity of New England, Armidale, NSW 2351, , Australia, Ph: 02 6773 2636, Fax: 02 6773 3307, E-mail: [email protected] ^b Geophysical Technology Limited, P. O. Box U9 Armidale, NSW 2351, Australia, Ph: 02 6773 3507, Fax: 02 6773 3307, E-mail: [email protected] ^c Geophysical Technology Limited, P.O. Box U9 Armidale, NSW 2351, Australia, Ph: 02 6773 2617, Fax: 02 6773 3307, E-mail: [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 29, Issue 3-4, Sep 1998, p. 290 - 295
DOI: https://doi.org/10.1071/EG998290
- Published online: 01 Sep 1998

Abstract

The Sub-Audio Magnetics (SAM) technique measures parameters related to electrical and magnetic characteristics of the sub-surface. A galvanic and/or electromagnetic source is used to excite current flow within the sub-surface. Measurements are taken with a rapid sampling, total field magnetometer while continuously traversing within the survey area.

By selecting the transmitted waveform appropriately, magnetic signals related to separate physical phenomena become distinguishable and can be observed within the measured magnetic field variations. Signal processing techniques are then used to obtain the following measurements:

• Total Magnetic Intensity (TMI)

• Total Field Magnetometric Resistivity (TFMMR)

• Total Field Magnetometric Induced Polarisation (TFMMIP)

• Total Field Electromagnetics (TFEM)

The measurements indicated are used to map variations in sub-surface resistivity, changeability and magnetic properties. While software and hardware limitations have previously restricted measurements to the TMI and TFMMR parameters, ongoing development of acquisition and processing software now allows all four parameters to be measured, potentially from a single survey.

Application of the SAM method to the Flying Doctor Lead/Zinc/Silver deposit showed that the mineralisation produced significant anomalous responses within the TFMMR. TFMMIP and TFEM parameters. Surface TFMMR and TFMMIP data are transformed to equivalent Magnetometric Resistivity (MMR) and Magnetometric Induced Polarisation (MIP) data, removing the data’s dependence on the direction of the Earth's ambient magnetic field direction.

A survey over an unexploded ordnance (UXO) test site showed that Total Magnetic Intensity (TMI) and transient electromagnetic (TFEM) data may be simultaneously acquired and used to locate these types of targets.

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References

Cattach. M.K., Stanley, J.M. and Lee, S.J., 1991, Sub-Audio Magnetics Instrument: International Patent PCT/AU91/00238.
Cattach, M.K., Stanley, J.M., Lee, S.J. and Boyd, G.W., 1993, Sub-Audio Magnetics (SAM) - a high resolution technique for simultaneously mapping electrical and magnetic properties: Expl. Geophys., 24, 387–400.
Cattach, M.K., 1996, Sub-Audio Magnetics (SAM). A high resolution geophysical method for simultaneously mapping electrical and magnetic properties of the earth: PhD Thesis, University of New England.
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Article Type: Research Article

Keyword(s): Magnetometric Resistivity. Magnetometric Induced Polarisation; MMR; SAM; Sub-Audio Magnetics; TFMMIP. TFEM. MIP; TFMMR; TMI; Transient Electromagnetics

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Feasibility studies of TFMMIP and TFEM surveying with Sub-Audio Magnetics

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