Dictionary:Percent frequency effect (PFE)

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1. The basic polarization parameter measured in frequency-domain resistivity surveys, being the percent difference in apparent resistivity measured at two frequencies:

where and are the low- and high-frequency apparent resistivities.


2. Decade-normalized PFE is multiplied by the log of the frequency ratio:


3. Keller suggests that PFE be defined as:

where ρ1 and ρ2 are apparent resistivities measured at two frequencies that are a factor of 10 apart.