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Title: Isostatic gravity map of the Nevada Test Site and vicinity, Nevada

Abstract

The isostatic gravity map of the Nevada Test Site (NTS) and vicinity is based on about 16,000 gravity stations. Principal facts of the gravity data were listed by Harris and others (1989) and their report included descriptions of base stations, high-precision and absolute gravity stations, and data accuracy. Observed gravity values were referenced to the International Gravity Standardization Net 1971 gravity datum described by Morelli (1974) and reduced using the Geodetic Reference System 1967 formula for the normal gravity on the ellipsoid (International Union of Geodesy and Geophysics, 1971). Free-air, Bouguer, curvature, and terrain corrections for a standard reduction density of 2.67 g/cm{sup 3} were made to compute complete Bouguer anomalies. Terrain corrections were made to a radial distance of 166.7 km from each station using a digital elevation model and a computer procedure by Plouff (1977) and, in general, include manually estimated inner-zone terrain corrections. Finally, isostatic corrections were made using a procedure by Simpson and others (1983) based on an Airy-Heiskanen model with local compensation (Heiskanen and Moritz, 1967) with an upper-crustal density of 2.67 g/cm{sup 3}, a crustal thickness of 25 km, and a density contrast between the lower-crust and upper-mantle of 0.4 g/cm{sup 3}. Isostatic correctionsmore » help remove the effects of long-wavelength anomalies related to topography and their compensating masses and, thus, enhance short- to moderate-wavelength anomalies caused by near surface geologic features. 6 refs.« less

Authors:
; ;
Publication Date:
Research Org.:
Geological Survey, Menlo Park, CA (United States)
OSTI Identifier:
137901
Report Number(s):
USGS-OFR-88-664
DOE Contract Number:  
AI08-78ET44802
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1988
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 05 NUCLEAR FUELS; NEVADA TEST SITE; GRAVITY SURVEYS; MAPS; MAPPING; TOPOGRAPHY; GEOLOGY; GEOLOGIC DEPOSITS; GEOLOGIC SURVEYS; Yucca Mountain Project

Citation Formats

Ponce, D.A., Harris, R.N., and Oliver, H.W. Isostatic gravity map of the Nevada Test Site and vicinity, Nevada. United States: N. p., 1988. Web.
Ponce, D.A., Harris, R.N., & Oliver, H.W. Isostatic gravity map of the Nevada Test Site and vicinity, Nevada. United States.
Ponce, D.A., Harris, R.N., and Oliver, H.W. Sat . "Isostatic gravity map of the Nevada Test Site and vicinity, Nevada". United States.
@article{osti_137901,
title = {Isostatic gravity map of the Nevada Test Site and vicinity, Nevada},
author = {Ponce, D.A. and Harris, R.N. and Oliver, H.W.},
abstractNote = {The isostatic gravity map of the Nevada Test Site (NTS) and vicinity is based on about 16,000 gravity stations. Principal facts of the gravity data were listed by Harris and others (1989) and their report included descriptions of base stations, high-precision and absolute gravity stations, and data accuracy. Observed gravity values were referenced to the International Gravity Standardization Net 1971 gravity datum described by Morelli (1974) and reduced using the Geodetic Reference System 1967 formula for the normal gravity on the ellipsoid (International Union of Geodesy and Geophysics, 1971). Free-air, Bouguer, curvature, and terrain corrections for a standard reduction density of 2.67 g/cm{sup 3} were made to compute complete Bouguer anomalies. Terrain corrections were made to a radial distance of 166.7 km from each station using a digital elevation model and a computer procedure by Plouff (1977) and, in general, include manually estimated inner-zone terrain corrections. Finally, isostatic corrections were made using a procedure by Simpson and others (1983) based on an Airy-Heiskanen model with local compensation (Heiskanen and Moritz, 1967) with an upper-crustal density of 2.67 g/cm{sup 3}, a crustal thickness of 25 km, and a density contrast between the lower-crust and upper-mantle of 0.4 g/cm{sup 3}. Isostatic corrections help remove the effects of long-wavelength anomalies related to topography and their compensating masses and, thus, enhance short- to moderate-wavelength anomalies caused by near surface geologic features. 6 refs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Dec 31 00:00:00 EST 1988},
month = {Sat Dec 31 00:00:00 EST 1988}
}

Technical Report:
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