A simple method for calculating apparent resistivity from electromagnetic sounding data

Abstract

Frequency‐domain electromagnetic (EM) sounding is becoming an increasingly useful deep‐exploration tool with recent applications to crustal sounding and geothermal exploration (Tripp et al, 1978; Sternberg, 1979; Duncan et al, 1980; Stark et al, 1980). A major drawback of the method is that most field data are analyzed by computer after the data are returned to the laboratory; no intermediate parameters, such as apparent resistivity, are calculated to provide on‐site information. The following example illustrates this problem.