Electrical Properties of the Earth's Crust. A Survey of the Literature.
Final rept. 15 Apr-31 Oct 70,
COLORADO SCHOOL OF MINES GOLDEN
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The electrical conductivity of the earth appears to pass through a minimum value at moderate depths, probably between 10 and 20 kilometers. At lesser depths, rocks contain sufficient water-filled void space to be moderately conductive, and at greater depths, increased temperatures again render rocks conductive. The problem of determining the conductivity in this minimum zone is a difficult one. A possible solution lies in the use of electromagnetic coupling measurements for studying this zone in the crust.
- Geology, Geochemistry and Mineralogy