A simple method of separating inductive coupling effects from induced polarization (IP) effects in low-frequency IP measurements was described by Hallof (1974). The basis of the method is that the polarization effect can be approximated as constant phase over a limited frequency range, while the inductive phase response varies as different powers of the frequency. Hallof used linear and quadratic frequency variations, to fit curves to phase measurements at two and three frequencies, respectively. Three-point formulas for separation of a constant-phase polarization effect from an inductive-phase response varying as frequency and (frequency)2 are now commonly applied to multifrequency IP measurements.

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