Abstract
The purpose of this report is to discuss some of the techniques that can be applied to the problem of geophysical exploration beneath various kinds of cover and overburden. A brief view of the electrical properties found in different geographic environments is included and the problem of exploring in areas of high resistivity cover and low resistivity cover is considered. It is shown that several techniques such as induced polarization, electromagnetic sounding, magnetotellurics and radio frequency interferometry have a particular application in areas of high resistivity cover. The problem of exploring in areas of low resistivity cover is much more difficult. It is to be hoped that the induced polarization technique can be used in these cases, but it requires a much improved understanding of the problems of electromagnetic coupling. It is also shown that the new techniques of data processing and filtering can help significantly in the problem of aeromagnetic interpretation in areas of volcanic cover.
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