Spectral induced polarisation

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Spectral induced polarisation (SIP) or Complex resistivity is a geophysical survey technique and an extension of the induced polarisation (IP) method, being itself an extension of measuring the Earth's resistance at a single frequency or under direct current (a technique commonly known by the name resistivity).[1] SIP measures the frequency-dependent (i.e. spectral) complex impedance, equivalent to the amount of resistance and phase shift between electrical current and voltage. The usual frequency range for alternating current (AC) applied during SIP surveys is tens of kHz to mHz. As with other geophysical methods, SIP aims to distinguish material properties of the subsurface, such as salinity and saturation.

References

  1. ↑ Reynolds, John (1997). An Introduction to Applied and Environmental Geophysics. Wiley. pp. 533–537. ISBN 978-0-471-95555-9. 
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