ERT is a non-invasive method for imaging the Earth’s subsurface, frequently employed in the search for minerals, exploration of water resources, study of the environment, and civil and archaeological projects.

This technique is highly effective in determining the electrical characteristics of materials beneath the surface, with changes in electrical resistivity often linked to differences in rock types, water content, the ability of fluids to conduct electricity, the amount of open space, and the permeability of the ground. This information can be used to delineate different layers of the Earth’s crust, identify geological structures, and locate sinkholes, cracks, and areas of groundwater.

Data Acquisition

Data acquisition of resistivity involves sending an electric current into the earth through two electrodes, and then the resulting electric field is measured by another set of electrodes. This setup needs the placement of a series of electrodes that are evenly spaced, and are linked to a main control device through several-core cables. The resistivity information is then collected by using various combinations of current and potential electrode sets to create an approximate cross-sectional view of the resistivity underneath the survey line.

The depth of exploration is determined by the distance between the electrodes and their shape, with wider electrode distances allowing for bulk resistivity readings from deeper depths

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