Electromagnetic induction information from differences at aeromagnetic crossover points

This paper describes an investigation of the use of aeromagnetic crossover misfits as a source of geological information. The misfits occur when, at a crossover point of an aeromagnetic survey, the separate measurements of the Earth's magnetic field are not the same. Misfits are mainly the resu...

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Bibliographic Details
Published in:Geophysical journal international 2001-04, Vol.145 (1), p.277-290
Main Authors: Hitchman, A. P., Lilley, F. E. M., Milligan, P. R.
Format: Article
Language:English
Subjects:
aeromagnetic crossover misfits
electrical conductivity
electromagnetic induction
geomagnetism
total magnetic field
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Summary:This paper describes an investigation of the use of aeromagnetic crossover misfits as a source of geological information. The misfits occur when, at a crossover point of an aeromagnetic survey, the separate measurements of the Earth's magnetic field are not the same. Misfits are mainly the result of time‐dependent field changes and, in this paper, are analysed as indicators of electromagnetic induction in the Earth, and thus of electrical conductivity structure. The method derives estimates of a magnetic diurnal variation function both for cells within the surveyed area and for a reference base station. Normalizing the former by the latter gives extra information from the aeromagnetic data. A case history from Australia is presented of the method applied to an aeromagnetic survey conducted in a region containing a known electrical conductivity structure. The presence of the conductivity anomaly is evident in the aeromagnetic misfit results.
ISSN:0956-540X
1365-246X
DOI:10.1111/j.1365-246X.2001.00389.x