Geomagnetic Variations in the Eastern United States: avidence for a Highly Conducting Lower Crust?

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Science  16 May 1975:
Vol. 188, Issue 4189, pp. 726-728
DOI: 10.1126/science.188.4189.726


Temporal geomagnetic variations, recorded at ten stations across the eastcentral United States, are interpreted in terms of the electrical conductivity structure of the earth beneath this region. The results are surprising and suggest that the lower crust is highly conducting, having distinct lateral variations in conductivity beneath the Appalachian Mountains.