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.
This paper contains a detailed interpretation of E-field ratio telluric, bipo1e-dipole resistivity mapping, and dipole-dipole resistivity data obtained in the course of geop~ysical exploration of the Leach Hot Springs area of Grass Valley, Nevada. Several areas are singled out as being worthy of further investigation of their geothermal potential. Comparison of the three electrical exploration techniques indicates that: the bipole-dipole resistivity mapping method is the least useful; the dipole-dipole.resistivity method can be very useful, but is~ for practical purposes, exceptlonally expensive and difficult to interpret; the E-field ratio telluric method can be a highly successful reconnaissance technique for delineating structures and relating the resistivities of different regions within the survey area.
This paper is a two-dimensional numerical model study and comparison of the polar dipole-dipole and Schlumberger resistivity arrays. A catalog of dipole-dipole and Schlumberger apparent resistivity pseudo-sections is presented. It is concluded that: for
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