Description

Electrical resistivity imaging is a survey technique designed for the investigation of areas of complex geology; this involves measuring a series of resistivity profiles, using a computer to control measurements between selected sets of an electrode array. Since increasing separation provides information from increasingly greater depths, the measured apparent resistivities may be processed, to provide an image of true resistivity against depth.

GEOLOGICAL STRUCTURE:
In areas where the depth to bedrock is considerably variable, electrical images can be provide more useful information than is obtained by conventional resistivity sounding. Providing there is a significant resistivity contrast at the interface between the bedrock and the overlying strata, reasonably accurate results may be expected.

CONTAMINATED GROUNDWATER:
The presence of contaminated groundwater can often be recognized by a decrease in formation resistivity, since the latter is primarily dependent on the resistivity of the pore water.

A very fast and cost-effective technique for measuring resistivity profiles and delineating areas of changing resistivity.