Abstract

Using previously developed methods for calculating the potential about an electrode on the surface of a stratified earth, the fractions of total current, due to two current electrodes, flowing in a given layer and across the vertical plane mid-way between the electrodes, are calculated. The method employed is applicable in principle to any number of layers, and numerical values are given for two-layer and three-layer earths. Curves are given showing the variation of these current fractions with electrode spacing for the following types of conductivity stratification: two-layer earths with complete range of conductivity ratios; three-layer earths which are homogeneous except for the middle layer, the latter having thicknesses equal to or twice that of the top stratum; and three-layer earths having either infinitely conducting or resisting bottom layers and with middle stratum thicknesses equal to, twice, or three times that of the uppermost stratum.

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