| Abstract: | This report presents audiomagnetotelluric (AMT) data along fourteen profiles in Spring, Delamar, and Dry Lake Valleys, and the corresponding preliminary two-dimensional (2-D) inverse models. The AMT method is a valuable tool for estimating the electrical resistivity of the Earth over depth ranges from a few meters to less than one kilometer, and it is important for revealing subsurface structure and stratigraphy within the Basin and Range province of eastern Nevada, which can be used to define the geohydrologic framework of the region. We collected AMT data by using the Geometrics StrataGem EH4 system. Profiles were 0.7 - 3.2 km in length with station spacing of 50-400 m. Data were recorded in a coordinate system parallel to and perpendicular to the regional geologic-strike direction with Z positive down. We show AMT station locations, sounding curves of apparent resistivity, phase, and coherency, and 2-D models of subsurface resistivity along the profiles. The 2-D inverse models are computed from the transverse electric (TE), transverse magnetic (TM), and TE+TM mode data by using a conjugate gradient, finite-difference method. Preliminary interpretation of the 2-D models defines the structural framework of the basins and the resistivity contrasts between alluvial basin-fill, volcanic units, and carbonate basement rocks. |
| Genre: | USGS Numbered Series |
| ProdID: | 86282 |
| Citation Author: | McPhee, Darcy K.; Chuchel, Bruce A.; Pellerin, Louise |
| Citation Contributing Office: | Geological Survey (U.S.) |
| Citation Datum: | |
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| Citation Edition: | Version 1.0 |
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| Citation Language: | ENGLISH |
| Citation Larger Work Title: | |
| Citation LatN: | 0390000 |
| Citation LatS: | 03500000 |
| Citation LonE: | -1140000 |
| Citation LonW: | -1143600 |
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| Citation Online Only Flag: | Y |
| Citation Phsyical Description: | Report: 59 p.; Appendix |
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| Citation Public Comments: | Prepared in cooperation with the Southern Nevada Water Authority (SNWA) |
| Citation Publisher: | Geological Survey (U.S.) |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 2008-1301 |
| Citation Search Results Text: | Audiomagnetotelluric Data and Preliminary Two-Dimensional Models from Spring, Dry Lake, and Delamar Valleys, Nevada; 2008; OFR; 2008-1301; McPhee, Darcy K.; Chuchel, Bruce A.; Pellerin, Louise |
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| Citation Year: | 2008 |
| Type: | citation/reference |
| Text: | Audiomagnetotelluric Data and Preliminary Two-Dimensional Models from Spring, Dry Lake, and Delamar Valleys, Nevada; 2008; OFR; 2008-1301; McPhee, Darcy K.; Chuchel, Bruce A.; Pellerin, Louise |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/of/2008/1301/ |
| Date Other: | Sat, 4 Oct 2008 00:00 -0500 |
| Publisher: | Geological Survey (U.S.) |
