Electrical Resistivity Tomography (ERT)

Electrical Resistivity Tomography (ERT) is a method used to create images of the underground by measuring how easily electricity flows through different materials. During ERT, electrical currents are sent into the ground through electrodes, and the resulting voltages are recorded on the surface. Variations in how well the ground conducts electricity reveal differences in material properties, such as water content, rock type, or contamination. These measurements are then processed with computer algorithms to produce a detailed, 2D or 3D map showing the subsurface's resistivity distribution, helping to identify features like voids, minerals, or pollutant zones.