DEEP EARTH CONDUCTIVITY MEASUREMENT TECHNIQUES
DECO ELECTRONICS INC BOULDER CO
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Since 1960 DECO Electronics, Inc. has obtained considerable experience in the technique of measuring the electrical conductivity of the earth. This report deals specifically with the four-terminal array methods, their underlying theory and interpretation procedures. Field techniques for concentrated shallow surveys or deep crustal surveys are given. The instrumentation for the shallow surveys consists of commercially available components, whereas the equipment for the deep measurements was designed and built by DECO. The appendix to this report, A Manual for the Interpretation of Layered Conductivity Curves for the Sequency High-Low-High, by Dr. G. V. Keller, discusses in detail many of the problems associated with the real earth in contrast to the idealized earth for which most of the theory has previously been developed. Theoretical curves for several two and three layer cases, effective spacing curves and cross dipole curves are included in the set of curves.
- Geology, Geochemistry and Mineralogy