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.
- Kearey, Philip; Michael Brooks (1991). An Introduction to Gephysical Exploration (Second edition ed.), Blackwell Science. ISBN 0-632-02923-4.
-  Example IP equipment and image results
- Software for 2D resistivity and IP forward modeling and inversion.