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Electrical resistivity tomography is a non-invasive imaging technique used in geophysics to visualize subsurface structures and properties. It involves measuring the electrical resistivity of the Earth's subsurface by injecting electrical currents into the ground and measuring the resulting voltages.
By analyzing how these currents travel through different materials, geophysicists can create 2D or 3D images revealing variations in subsurface resistivity, which can indicate the presence of geological features like groundwater, minerals, faults, or archaeological artifacts.