There have been many recent advances in instrumentation and data interpretation resulting in more efficient surveys and accurate earth models. It is widely used in environmental and engineering (Dahlin, 2001 Chambers et al., 2006) and mineral exploration (White et al., 2001 Legault et al., 2008) surveys. It has been used to image targets from the millimeter scale to structures with dimensions of kilometers (Linderholm et al., 2008 Storz et al., 2000). The resistivity survey method is more than 100 years old and is one of the most commonly used geophysical exploration methods (Reynolds, 1997). Multi-core cable. A cable with a number of independent wires.Apparent resistivity. The apparent resistivity is the resistivity of an equivalent homogeneous earth model that will give the same potential value as the true earth model for the same current and electrodes arrangement.Electrode. A conductor planted into the ground through which current is passed, or which is used to measure the voltage caused by the current.Resistivity meter. An instrument used to carry out resistivity surveys that usually has a current transmitter and voltage-measuring circuitry.Electrical survey. Mapping subsurface resistivity by injecting an electrical current into the ground.“Instrumentation, electrical resistivity.” In Solid Earth Geophysics Encyclopedia (2nd Edition), Electrical & Electromagnetic, Gupta, Harsh (ed), 599–604.
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