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SIGN REVERSALS IN THE TRANSIENT METHOD OF ELECTRICAL PROSPECTING (ONE‐LOOP VERSION) *
Author(s) -
LEE T.
Publication year - 1975
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1975.tb01551.x
Subject(s) - transient (computer programming) , prospecting , sign (mathematics) , electrical resistivity and conductivity , conductivity , geophysics , geology , physics , mineralogy , mathematical analysis , mathematics , quantum mechanics , computer science , mining engineering , operating system
A bstract 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.