A recent development is 4-D time-lapse surveys. However due to recent developments in field equipment design, interpretation software and microcomputer technology, two-dimensional (2D) and three-dimensional (3D) surveys are now practical geophysical exploration tools for environmental, engineering and mineral exploration studies. Until the early 1990's, the resistivity method has been used as a one-dimensional (1D) tool where quantitative modelling was confined to simple horizontal layers which are not sufficiently accurate for complex geological environments. Over the last 25 years, there has been a revolutionary change in the resistivity (and IP) surveying method.
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