Tripotential resistivity techniques in the detection of cavities

Abstract

The present paper illustrates the application of resistivity methods to the detection of cavities. Owing to the nature of the problem, it is proposed the use of tri-potential techniques with Wenner arrays. Two parallel sounding profiles over the «Nascente do Almonda» Cave are discussed and interpreted in terms of resistivity pseudo sections and Pb/Py ratio sections. These field measurements are interpreted with the aid of tank analogue results.

From the example herein discussed, the use of Pb/Py ratios stands out in the final interpretation of the resistivity measurements carried out in a zone where non outcropping two-dimensional structures are present.