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SELF POTENTIAL AND CURRENT CHANNELLING *
Author(s) -
CULL J. P.
Publication year - 1985
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.1365-2478.1985.tb00446.x
Subject(s) - channelling , current (fluid) , electrical resistivity and conductivity , geology , regional geology , direct current , voltage , geophysics , telmatology , physics , hydrogeology , ion , geotechnical engineering , oceanography , quantum mechanics
Anomalies in self potential (SP) are usually explained in terms of geochemical activity. However, there are other sources of current which cause complications in the interpretation. In particular, DC telluric currents can be generated outside the survey region. Contrasts in resistivity cause current channelling and secondary voltages can be induced by leakage. The effect can be demonstrated using network theory and internal sources can be emphasized by subtraction. Joint surveys are required to demonstrate correlations with apparent resistivity.