![]() ![]() 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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