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Controlled-source electromagnetic survey at Soda Lakes geothermal area, Nevada [electronic resource].

Published
Berkeley, Calif. : University of California, Berkeley, 1980.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
98 pages : digital, PDF file
Additional Creators
University of California, Berkeley and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The EM-60 system, a large-moment frequency-domain electromagnetic loop prospecting system, was operated in the Soda Lakes geothermal area, Nevada. Thirteen stations were occupied at distances ranging from 0.5-3.0 km from two transmitter sites. These yielded four sounding curves--the normalized amplitudes and phases of the vertical and radial magnetic fields as a function of frequency--at each station. In addition, two polarization ellipse parameters, ellipticity and tilt angle, were calculated at each frequency. The data were interpreted by means of a least-squares inversion procedure which fits a layered resistivity model to the data. A three-layer structure is indicated, with a near-surface 20 ohm-m layer of 100-400 m thickness, a middle 2 ohm-m layer of approximately 1 km thickness, and a basement of greater than 10 ohm-m. The models indicate a northwesterly structural strike; the top and middle layers seem to thicken from northeast to southwest. The results agree quite well with previous results of dipole-dipole and magnetotelluric (MT) surveys. The EM-60 survey provided greater depth penetration (1 to 1.5 km) than dipole-dipole, but MT far surpassed both in its depth of exploration. One advantage of EM in this area is its ease and speed of operation. Another advantage, its relative insensitivity to lateral inhomogeneities, is not as pronounced here as it would be in areas of more complex geology.
Report Numbers
E 1.99:lbl-11221
lbl-11221
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
07/01/1980.
"lbl-11221"
Stark, M.; Goldstein, N.; Wilt, M.; Haught, J.R.
Funding Information
W-7405-ENG-48
View MARC record | catkey: 14386876