PREPARATION OF A WORLD WIDE VLF EFFECTIVE CONDUCTIVITY MAP
WESTINGHOUSE ELECTRIC CORP BOULDER CO ENVIRONMENTAL SCIENCE AND TECHNOLOGY DEPT
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A map showing effective electrical earth conductivity values for a propagating wave at VLF 10 kHz to 30 kHz has been prepared for the major land areas of the world. Land area conductivity determinations were in most cases based upon known geological and climatological information. Actual conductivity data was collected where possible to aid in determining regional effective conductivity values, but the correlation between geology and other known factors, and conductivity was used in estimating conductivity for the majority of the land areas. The conductivity data are overprinted on seven 17 x 22 inch base maps. Effective conductivity values are designed by numbers from 1 to 10 referenced to a legend on each sheet. Separate page-size maps showing a confidence factor and a variability factor are included in the accompanying report.
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