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.
Frequency domain IP methods (see Spectral Induced Polarisation) use alternating currents (AC) to induce electric charges in the subsurface, and the apparent resistivity is measured at different AC frequencies.
- Kearey, Philip; Michael Brooks (1991). An Introduction to Geophysical Exploration (Second edition ed.). Blackwell Science. ISBN 0-632-02923-4.
-  Example IP equipment and image results
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