Induced polarization

In an IP survey (and when making resistivity measurements), capacitive properties of the subsurface materials are determined as well.

As a result, IP surveys provide additional information about the spatial variation in lithology and grain-surface chemistry.

[4] In the frequency-domain induced polarization mode, an alternating current is injected into the ground with variable frequencies.

Voltage phase-shifts are measured to evaluate the impedance spectrum at different injection frequencies — this is commonly referred to as spectral IP.

Additionally, IP has applications in hydrogeophysical surveying, environmental investigations and geotechnical engineering projects.