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Open-File Report 03-6

Principal Facts for Gravity Stations in the Dry Valley Area, West-Central Nevada and East-Central California

By Elizabeth A. Sanger and David A. Ponce

Thumbnail of and link to report PDF (12.4 MB)Introduction

In June, 2002, the U.S. Geological Survey (USGS) established 143 new gravity stations and 12 new rock samples in the Dry Valley area, 30 miles north of Reno, Nevada, on the California - Nevada border (see fig. 1). This study reports on gravity, magnetic, and physical property data intended for use in modeling the geometry and depth of Dry Valley for groundwater analysis. It is part of a larger study that aims to characterize the hydrologic framework of several basins in Washoe County. Dry Valley is located south of the Fort Sage Mountains and south-east of Long Valley, on USGS 7.5’ quadrangles Constantia and Seven Lakes (fig. 2). The Cretaceous granitic rocks and Tertiary volcanic rocks that bound the sediment filled basin (fig. 3) may be especially important to future modeling because of their impact on groundwater flow. The granitic and volcanic rocks of Dry Valley exhibit densities and magnetic susceptibilities higher than the overlaying sediments, and create a distinguishable pattern of gravity and magnetic anomalies that reflect these properties.

First posted February 20, 2003

  • Gravity TXT (25 kB)
    Tab delimited text file containing the digital isostatic gravity data for Dry Valley Area

For additional information, contact:
Geology, Minerals, Energy, and Geophysics Science Center
U.S. Geological Survey
345 Middlefield Road, MS 901
Menlo Park, CA 94025-3591

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Suggested citation:

Sanger, Elizabeth A., Ponce, David A., 2003, Principal Facts for Gravity Stations in the Dry Valley Area, West-Central Nevada and East-Central California: U. S. Geological Survey Open-File Report 03-6, 23 pp.,

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