Volume 20 Number 4
  • E-ISSN: 1365-2478



The indirect method of interpreting resistivity data is capable only of limited success because of the difficulty of calculating type curves for complex structures. Consequently a need arises for a direct method of interpretation for complex generalized structures.

Such a technique for the direct interpretation of apparent resistivity data, obtained by electrical soundings carried out over two‐dimensional structures, has been developed from an examination of the Hankel transform of such data. The method is based on the observation that the asymptotic expansion of the Hankel transform is critically dependent upon the minimum distance between the measuring device and the surface of discontinuity in resistivity.

The variation in the across strike direction may be mapped by a sequence of depth soundings made parallel to each other and separated in the across strike direction.


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  • Article Type: Research Article
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