Preliminary gravity inversion model of Frenchman Flat Basin, Nevada Test Site, Nevada
Open-File Report
2002-363
By: Geoffrey A. Phelps and Scott E. Graham
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Abstract
The depth of the basin beneath Frenchman Flat is estimated using a gravity inversion method. Gamma-gamma density logs from two wells in Frenchman Flat constrained the density profiles used to create the gravity inversion model. Three initial models were considered using data from one well, then a final model is proposed based on new information from the second well. The preferred model indicates that a northeast-trending oval-shaped basin underlies Frenchman Flat at least 2,100 m deep, with a maximum depth of 2,400 m at its northeast end. No major horst and graben structures are predicted. Sensitivity analysis of the model indicates that each parameter contributes the same magnitude change to the model, up to 30 meters change in depth for a 1% change in density, but some parameters affect a broader area of the basin. The horizontal resolution of the model was determined by examining the spacing between data stations, and was set to 500 square meters.
Suggested Citation
Phelps, G., Graham, S.E., 2002, Preliminary gravity inversion model of Frenchman Flat Basin, Nevada Test Site, Nevada: U.S. Geological Survey Open-File Report 2002-363, Report: 23 p.; 1 Plate: 21.61 x 30.53 inches, https://doi.org/10.3133/ofr02363.
ISSN: 2331-1258 (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Preliminary gravity inversion model of Frenchman Flat Basin, Nevada Test Site, Nevada |
| Series title | Open-File Report |
| Series number | 2002-363 |
| DOI | 10.3133/ofr02363 |
| Year Published | 2002 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Geology, Minerals, Energy, and Geophysics Science Center |
| Description | Report: 23 p.; 1 Plate: 21.61 x 30.53 inches |
| Country | United States |
| State | Nevada |
| Datum | North American Datum of 1927 |
| Projection | Universal Transverse Mercator, zone 11 |
| Scale | 24000 |
| Additional Online Files (Y/N) | Y |