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U.S. Geological Survey Crustal Studies Technical Letter Number 32

In cooperation with the Defense Advanced Research Projects Agency

A Final Report on Computed Magneto-Telluric Curves for Hypothetical Models of Crustal Structure

By J.I. Pritchard


Thumbnail of and link to report PDF (13.4 MB)Abstract

Several mathematical models were investigated to determine the capa-bilities of the magneto-telluric method for determining the resistivity structure of the earth's crust. The model parameters were based on the crust model proposed by Keller (1963). The mathematical technique used was developed by Cagniard (1953).

The investigations indicate that a three-layer model approximation of the crust and mantle is the most detailed model warranted in inter-preting the information provided by the magneto-telluric method about the lower crust. Only the thickness of the lower crust can be determined, and not the resistivity.

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Menlo Park, California 94025

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Suggested citation:

Pritchard, J.I., 1965, A final report on computed magneto-telluric curves for hypothetical models of crustal structure: U.S. Geological Survey Crustal Studies Technical Letter Number 32, 15 p. (Available at




Sedimentary Models

Models of Special Resistivity Layering Sections



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