Filters: Tags: gravitational field (earth) (X)21 results (128ms)
Gravity data were collected from 2006 through 2015 to assist in mapping subsurface geology in the southern San Luis Basin, northern New Mexico. This data release provides principal facts for 566 new gravity stations that were acquired to fill in gaps in the existing public gravity data coverage.
Geologic Map of the Mound Spring Quadrangle, Nye and ClarkCounties, Nevada, and Inyo County, California
The Mound Spring quadrangle, the southwestern-most 7.5'quadrangle of the area of the Las Vegas 1:100,000-scalequadrangle, is entirely within the Pahrump Valley, spanning theNevada/California State line. New geologic mapping of thepredominantly Quaternary materials is combined with new studiesof gravity and geochronology in this quadrangle. Elevenpredominantly fine-grained units are delineated, including playasediment, dune sand, and deposits associated with several cyclesof past groundwater discharge and distal fan sedimentation.These units are intercalated with 5 predominantly coarse-grainedalluvial-fan and wash gravel units mainly derived from the SpringMountains. The gravel units are distinguished on the basis...
Aeromagnetic surveys of Illinois, Indiana, and Ohio, merged to form seamless grids across the state. Gravity anomaly data are provided as well.
Aeromagnetic surveys of Nevada, merged to form seamless grids across the state. Gravity anomaly data are provided as well. Data provided in a variety of formats.
A set of geophysical maps with anomalies that are labeled and keyed to tables containing information on each anomaly and its source.
Aeromagnetic surveys of South Carolina, merged to form seamless grids across the state. Gravity anomaly data are provided as well. Data provided in a variety of formats.
Gravity station data and hand-held magnetometer measurements withanalysis and description of methodology.
Principal facts (gravity observations) for 185 new stations
Physical properties of geologic units are important for geophysical interpretation because they provide the tie between lithology and geophysical fields. For gravity data, the applicable physical property is bulk density, which is the overall mass per unit volume of rocks, sediments, and their pore spaces. Bulk dry density is the mass per unit volume measured when the sample is dry. Saturated density is the mass per unit volume measured when the sample is saturated with fresh water, which has a density of 1,000 kg/m^3. The two values are commonly compared in order to determine the porosity of a sample, that is, the percentage of the volume that is composed of open space. Density is commonly reported in kilograms...
New gravity measurements in the vicinity of San Bernardino, Californiawere collected to help define the characteristics of the Rialto-Coltonfault. The data were processed using standard reduction formulas andparameters. Rock properties such as lithology, magnetic susceptibilityand density also were measured at several locations.
Gravity map and data used to infer details of the geologic structure of the area. Surveys were conducted during or prior to 1975.
The datasets include geophysical and rock property measurements and models accompanying the FORGE Fallon Phase II study
Gravity and ground magnetic data from selected traverses in the Amargosa desert and vicinity, Nevada and California
Maps of aeromagnetic data and a table of gravity station data embedded in the PDF report, not as separate files
The depth of the basin beneath Frenchman Flat is estimatedusing a gravity inversion method.This dataset is distributed as an XYZ ASCII format data filegenerated from the 2002 gravity inversion model of the bedrockbeneath Frenchman Flat basin. Data forms a rectangular grid ofdata values in the defined projection. The data values are thedepth below the land surface,in meters, of the modeled locationof the Pre-Tertiary basement surface. The report whichaccompanies the data explains the modeling process and results.
Geology and Resource Assessment of Costa Rica at 1:500,000 Scale--ADigital Representation of Maps of the U.S. Geological Survey's 1987Folio I-1865
In 1986 and 1987, the U.S. Geological Survey (USGS), the Direcci�nGeneral de Geolog�a, Minas e Hidrocarburos, and the Universidad deCosta Rica conducted a mineral-resource assessment of the Republicof Costa Rica. The results were published as a large 80- by 50-cmcolor folio (U.S. Geological Survey and others, 1987). The 75-pagedocument consists of maps as well as descriptive and interpretivetext in English and Spanish covering physiographic, geologic,geochemical, geophysical, and mineral site themes as well as amineral-resource assessment. The following maps are present in theoriginal folio:1) Physiographic base map at a scale of 1:500,000 with hypsography,place names, and drainage.2) Geologic map at a scale of...
Helicopter magnetic and gravity gradiometry survey over the Pea Ridge iron mine and surrounding area, southeast Missouri, 2014
High resolution magnetic and gravity gradient data were collected using the HeliFalcon airborne gravity gradiometry system together with a stinger-mounted magnetometer. The survey took place out of the Sullivan, Missouri airport during March of 2014. The survey covers a 35 x 37 square-kilometer area centered on the Pea Ridge iron oxide-apatite rare-earth element deposit, which is located about halfway between the towns of Sullivan and Potosi, Missouri. Data were collected along north-south flight lines spaced 400 m apart with east-west tie lines flown every 4000 m. A nominal flight height above terrain of 80 m was maintained except where safety dictated a higher elevation. A total of 3538 line km of data were collected....
Report describing detailed interpretation of geophysical survey data to draw inferences about subsurface geologic features and likely consequences for the hydrogeologic system.
Aeromagnetic surveys of Missouri, merged to form seamless grids across the state. Gravity anomaly data are provided as well.
Resource potential and geology of the Grand Mesa, Uncompahgre, and Gunnison (GMUG) National Forests and vicinity, Colorado
Multi-chapter report combining geologic, geochemical, geophysical, and mining activity data. Downloadable data for coal resource information only.
Geophysical investigations of the Smoke Creek Desert and their geologic implications, northwest Nevada and northeast California
Gravity and aeromagnetic data analysis described in a report, with a few physical property analyses