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| Title: |
Controlled-source electromagnetic survey at Soda Lakes geothermal area, Nevada |
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| Creator/Author: |
Stark, M.
;
Wilt, M.
;
Haught, J.R.
;
Goldstein, N.
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| Publication Date: | None |
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| OSTI Identifier: | OSTI 5111455 |
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| Report Number(s): | LBL-11221 |
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| DOE Contract Number: | W-7405-ENG-48 |
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| Document Type: | Technical Report |
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| Specific Type: | |
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| Coverage: | |
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| Resource Relation: | Other Information: PBD: 1 Jul 1980 |
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| Other Number(s): | |
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| Research Org: | California Univ., Berkeley, CA (US); Lawrence Berkeley Lab. (US) |
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| Sponsoring Org: | Not Available (US) |
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| Subject: | 15 GEOTHERMAL ENERGY; AMPLITUDES; BASEMENTS; ELECTROMAGNETIC SURVEYS; GEOTHERMAL FIELDS; MAGNETIC FIELDS; POLARIZATION; PROSPECTING; THICKNESS; VELOCITY; NEVADA; GEOLOGIC MODELS; GEOTHERMAL EXPLORATION; DATA; GEOLOGY; HYDROLOGY; KGRA; ELECTRICAL SURVEYS; EXPLORATION; GEOPHYSICAL SURVEYS; INFORMATION; NORTH AMERICA; USA |
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| Keywords: | GEOTHERMAL LEGACY |
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| Description/Abstract: | 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. |
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| Publisher: | |
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| Country of Publication: | US |
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| Language: | English |
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| Size/Format: | Medium: ED; Size: 98 pages |
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| Rights: | |
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| Availability: | NTIS, PC A05/MF A01.; OSTI as DE05111455 |
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| System Entry Date: | 2009 Oct 14 |
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