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Magnetotelluric soundings in the southwestern United States

June 25, 1966

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.

Publication Year 1966
Title Magnetotelluric soundings in the southwestern United States
DOI 10.1190/1.1439845
Authors Donald Plouff
Publication Type Article
Publication Subtype Journal Article
Series Title Geophysics
Index ID 70210801
Record Source USGS Publications Warehouse
USGS Organization Geology, Minerals, Energy, and Geophysics Science Center