In recent years, hydrogeologists have employed electrical surveying principles to detect and characterise fracture induced anisotropy, In particular, azimuthal resistivity surveying has been adopted (Leonard-Mayer (1984), Taylor and Fleming (1988), Ritzi and Andolsek (1992), Skjernaa and Jergensen (1993), al Hagrey (1994)) as a technique for determining the principal directions of electrical anisotropy and hence hydraulic conductivity. However, in most recent published examples of the application of azimuthal resistivity surveys, the technique has been poorly applied with resuits almost certainly wrongly interpreted. In this short paper we emphasise some of the pitfails and suggest methods of eliminating serious sources of interpretational ambiguity.


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