Induced polarization (IP) is a geophysical imaging technique used to identify subsurface materials, such as ore. The method is similar to electrical resistivity tomography, in that an electric current is induced into the subsurface through two electrodes, and voltage is monitored through two other electrodes. Time domain IP methods measure the vol... Found on http://en.wikipedia.org/wiki/Induced_polarization
a method of ground geophysical surveying employing an electrical current to determine indications of mineralization. Found on https://www.encyclo.co.uk/local/22710