Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001geoji.145..277h&link_type=abstract
Geophysical Journal International, Volume 145, Issue 1, pp. 277-290.
Astronomy and Astrophysics
Astronomy
Aeromagnetic Crossover Misfits, Electrical Conductivity, Electromagnetic Induction, Geomagnetism, Total Magnetic Field
Scientific paper
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.
Hitchman A. P.
Lilley E. M. F.
Milligan P. R.
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