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:

${\displaystyle PFE=100{\tfrac {(\rho _{dc}-\rho _{ac})}{\rho _{ac}}}}$

where ${\displaystyle \rho _{dc}}$ and ${\displaystyle \rho _{ac}}$ are the low- and high-frequency apparent resistivities.

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

${\displaystyle PFE=[100{\tfrac {(\rho _{dc}-\rho _{ac})}{\rho _{ac}}}]log_{10}({\frac {f_{ac}}{f_{dc}}})}$

3. Keller suggests that PFE be defined as:

${\displaystyle PFE=100{\tfrac {(\rho _{2}-\rho _{1})}{\sqrt {\rho _{1}\rho _{2}}}}}$

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