Magnetotelluric soundings in the southwestern United States




Twelve magnetotelluric soundings were made along a 460-mile traverse in the southwestern United States. Spectral analysis of digitized graphic records was used to determine apparent resistivities and phase differences for periods in the range 10-1,000 sec. The geoelectric section to depths of the order of 300 km was found to be divided into three principal layers. The layer nearest the surface has a resistivity of 200 ohm-m or less. The next layer, which begins in Paleozoic carbonate rock or near the top of the Precambrian rocks, has a resistivity of 500 ohm-m or more. The resistivity of the lowest layer is in the range 5-100 ohm-m and the depth to the top is in the range 20-150 km.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Magnetotelluric soundings in the southwestern United States
Series title Geophysics
DOI 10.1190/1.1439845
Volume 31
Issue 6
Year Published 1966
Language English
Publisher GeoScienceWorld
Contributing office(s) Geology, Minerals, Energy, and Geophysics Science Center
Description 8 p.
First page 1145
Last page 1152
Country United States
State Arizona, Utah
Other Geospatial Southwestern United States
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