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This paper describes a natural field electrical exploration technique, the E-field ratio telluric method. The method employs a collinear three-electrode array to measure successive electric field ratios as the array is leap-frogged along a survey line. The 0.05 and 8 Hz responses observed over numerous simple resistivity structures, based upon numerical modeling, are presented. From the model study it can be concluded that: th~ method is well suited for the rapid electrical reconnaissance exploration of survey areas of several hundred square kilometers, in search of deep conductive targets such as might be associated with hydrothermal systems; the frequencies used for the model study (0.05 and 8 Hz) are appropriate to exploration in Basin and Range valleys, and afford a rudimentary means of depth discrimination.

lawrence berkeley national laboratory

Telluric and D. C. resistivity techniques applied to the geophysical investigation of basin and range geothermal systems. Part I. The E-field ratio telluric method