Sign reversals in the transient method of electrical prospecting (one-loop version)
Journal name: Geophysical Prospecting
Issue: Vol 23, No 4, December 1975 pp. 653 - 662
Info: Article, PDF ( 496.35Kb )
The transient electromagnetic fields observed by the MPPO-1 equipment in practice over geological structures cannot always be adequately explained by Maxwell's equation when the imaginary part of the conductivity of the rocks is neglected.
If, for any reason, the conductivity of the rocks is a complex function of frequency such that the imaginary part is appreciable the model calculations must include this. This explains why some observed transient electromagnetic decay curves change sign with time.