Filters: Tags: crust (earth) (X)
15 results (31ms)|
Filters
Date Range
Contacts
Categories Tag Types Tag Schemes |
This data release provides access to a low-altitude, aeromagnetic survey over parts of Missouri, Arkansas, and Tennessee, an area centered about 100 km north of Memphis, Tennessee. The survey covers parts of the southern arm of the New Madrid seismic zone, the northwestern margin of the Reelfoot rift, the Blytheville arch, and the Commerce geophysical lineament (reference: Langenheim, V.E., and Hildenbrand, T.G., 1997, Geological Society of America Bulletin, v. 109, p. 580). The survey is underlain by Paleocene and younger sediments, consisting of silt, clay, sand, and gravel. Plutons and other intrusive rocks lie at depth. These data were acquired between July 12 and July 28, 2013, by EDCON-PRJ, Inc., working under...
This data release provides access to a low-altitude, aeromagnetic survey of a part of south-central Washington centered approximately 30 km east of Yakima and referred to as the Hanford aeromagnetic survey. The survey includes the city of Richland, numerous smaller communities, and the Hanford Site (https://www.hanford.gov). The Hanford aeromagnetic survey extends from the Columbia Plateau westward to the Cascade Range and illuminates magnetic anomalies associated with folds and faults of the Yakima folds, including the Toppenish Ridge, Ahtanum Ridge, Umtanum Ridge, Boyleston Mountain, Rattlesnake Mountain, Saddle Mountains, and Frenchman Hills anticlines. These data were acquired during September and October, 2009,...
This data release provides access to a low-altitude, aeromagnetic survey of a part of south-central Washington and north-central Oregon. The survey extends from the Blue Mountains westward to the Cascade Range and covers the Oregon cities of The Dalles, Hermiston, and Milton Freewater and the Washington cities of Richland, Pasco, Kennewick, and Walla Walla. Data were acquired during the summer of 2010 by Goldak Airborne Surveys working under contract to the U.S. Geological Survey. Total magnetic field values were acquired using a fixed-wing aircraft flown at a target elevation of 150 m above terrain (305 m over urban areas) and along flight lines and tie lines spaced 400 m and 4000 m apart, respectively. Flight...
This data release provides access to an aeromagnetic survey over a part of northern California, an area that includes the cities of Portola, California, and Reno, Nevada. The survey extends across the northern part of the Sierra Nevada from Honey Lake in the north to Lake Tahoe in the south and over parts of the Sierra Nevada foothills. These data were acquired between March 3 and May 3, 2021, by EDCON-PRJ, Inc., working under contract to the U.S. Geological Survey. The nominal flying height was based on a best fit, pre-planned, three-dimensional draped surface targeted at 305 m above terrain, subject to aircraft climb and descent limitations. Steep terrain in parts of the survey area required significant departures...
Regional surface elevation grid files (provided in Grid eXchange File format) were used to study crustal architecture beneath the Southern Midcontinent (USA) by McCafferty and others (2019). The study covered a rectangular, multi-state area of 924 by 924 kilometers centered on Missouri, and a corresponding volume extending from the topographic surface to a depth of 50 kilometers below sea level. The grid files (magnetic field observation surface, topographic surface, Precambrian basement surface, and Moho interface) were used to construct templates and initial physical property models for 3D inversions. A masked version of the Precambrian basement surface grid was used to remove inverted densities and magnetic susceptibilities...
This data release provides access to an aeromagnetic survey over a part of northeastern California, an area that includes the city of Alturas, California. The survey extends across the Devils Garden part of the Modoc Plateau (west of the Warner Range) and westward to over Medicine Lake volcano. The survey covers the Likely fault zone, an enigmatic northwest-striking set of structures with possible Quaternary activity, and extends south across the Madelaine Plains. These data were acquired between September 24 and November 2, 2019, by EDCON-PRJ, Inc., working under contract to the U.S. Geological Survey. The nominal flying height was based on a best fit, pre-planned, three-dimensional draped surface targeted...
Categories: Data;
Tags: Alturas,
Canby,
Geophysics,
USGS Science Data Catalog (SDC),
aeromagnetic surveying,
This data release contains gridded aeromagnetic data from a dataset that merges two aeromagnetic surveys of northeastern California. Data from the Alturas and Burney surveys were gridded and merged to provide a continuous, detailed aeromagnetic dataset of the region. The merged dataset was then corrected for the inclination of the Earth's magnetic field (reduced to pole or rtp); match-filtering of the merged rtp gridded dataset provides three dipole-equivalent source layers at 0.85 km (shallow), 3.28 km (medium), and 16.4 (deep) km. Magnetization boundaries were calculated using the maximum horizontal gradient method on the match-filtered gridded data. Lastly, a magnetic field caused by magnetic terrain was calculated...
Categories: Data;
Tags: Alturas,
Canby,
Geophysics,
USGS Science Data Catalog (SDC),
aeromagnetic surveying,
Crustal Architecture Beneath the Southern Midcontinent (USA) -- Data Grids and 3D Geophysical Models
Regional grid files and 3D voxel models were used to study crustal architecture beneath the Southern Midcontinent (USA) by McCafferty and others (2019). The study covered a rectangular, multi-state area of 924 by 924 kilometers centered on Missouri, and a corresponding volume extending from the topographic surface to a depth of 50 kilometers below sea level. The grid files consist of surface grids (magnetic field observation surface, topographic surface, Precambrian basement surface, and Moho interface) used to construct templates and initial physical property models for 3D inversions, observed geophysical data grids (Bouguer gravity anomaly and reduced-to-pole (RTP) aeromagnetic anomaly) used in the inversions,...
This data release provides access to a low-altitude, aeromagnetic survey of a part of north-central Washington. The survey is centered approximately 120 km northwest of Yakima and includes the small town of Skykomish. The Skykomish aeromagnetic survey covers a part of the central Cascade Range of Washington, the western portion of the Jurassic ophiolitic Ingalls tectonic complex, and the Cretaceous Mount Stuart batholith. These data were acquired during the summer of 2010 by Goldak Airborne Surveys working under contract to the U.S. Geological Survey. Total magnetic field values were acquired using a fixed-wing aircraft flown at a target elevation of 150 m above terrain and along flight lines and tie lines spaced...
This 3D voxel model of density in GOCAD format was used to study crustal architecture beneath the Southern Midcontinent (USA) by McCafferty and others (2019). The study covered a rectangular, multi-state area of 924 by 924 kilometers centered on Missouri, and a corresponding volume extending from the topographic surface to a depth of 50 kilometers below sea level. The 3D voxel model describes the density of the crust and upper mantle as interpreted using 3D inversion. The masked version excludes densities in areas where the Precambrian basement surface elevations are unknown. The individual voxel elements are 2,000 by 2,000 meters by 500 meters thick. The GOCAD voxel (GRID3D or Voxet) file format is documented...
This data release provides access to a low-altitude, aeromagnetic survey of a part of central Washington centered approximately 22 km west-southwest of Ellensburg. The survey includes the cities of Ellensburg, Cle Elum, and Yakima and is referred to as the Cle Elum aeromagnetic survey. The Cle Elum aeromagnetic survey extends from the Columbia Plateau westward to the eastern Cascade Range and illuminates magnetic anomalies associated with folds and faults of the Yakima folds, including the Umtanum Ridge, Saddle Mountains, and Frenchman Hills anticlines. These data were acquired during August and September, 2008, by Firefly Aviation, Ltd., working under contract to the U.S. Geological Survey. Total magnetic field...
Categories: Data;
Tags: Cle Elum,
Geophysics,
Kittitas,
Mineral Resources,
USGS Science Data Catalog (SDC),
The data in this release originate from a low-altitude, aeromagnetic survey of the Centralia and Chehalis area of southwestern Washington. The survey was conducted between September 22 and October 22, 2015, by Eon Geosciences, Inc, working under contract to the U.S. Geological Survey. The covered region extends from the Cascade Range in the east to Willapa Bay in the west, and includes the cities of Chehalis and Centralia, Washington, and a part of Interstate 5. Total magnetic field values were acquired using a fixed-wing aircraft flown at a target elevation of 200 m above terrain. Primary flight lines were oriented east-west and spaced 400 m apart; additional tie lines were oriented north-south and spaced 4000...
This data release provides access to a low-altitude, aeromagnetic survey of a part of eastern Washington and northwestern Idaho centered approximately at Spokane, Washington, and referred to as the Spokane aeromagnetic survey. The survey includes the cities of Spokane and Cheney, numerous smaller communities, and Fairchild Air Force Base. Magnetic anomalies reflect Miocene rocks of the Columbia River Basalt Group overlying Precambrian through Mesozoic basement rocks, including the Priest River metamorphic core complex. These data were acquired between May 17 and June 12, 2013, by EDCON-PRJ, Inc., working under contract to the U.S. Geological Survey. Total magnetic field values were acquired using a fixed-wing aircraft...
Categories: Data;
Tags: Cheney,
Geophysics,
Kootenai-Pend Oreille-Spokane,
Mineral Resources,
Spokane,
This data release provides access to a low-altitude, aeromagnetic survey over a part of northeastern Oregon, an area centered approximately over the city of La Grande. The survey is underlain by pre-Tertiary intrusive and metamorphic rocks exposed in the Wallowa Mountains and southern Blue Mountains, and basalts of the Miocene Columbia River Basalt Group exposed or shallowly buried elsewhere. The survey spans a part of the Klamath Mountains-Blue Mountains lineament, extending southwestward from the survey area to the Oregon Coast Range. These data were acquired between June 6 and August 3, 2017, by EDCON-PRJ, Inc., working under contract to the U.S. Geological Survey. The nominal flying height was based on a best...
Categories: Data;
Tags: La Grande,
Pendleton,
USGS Science Data Catalog (SDC),
aeromagnetic surveying,
crust (earth),
This data release provides access to a low-altitude, aeromagnetic survey of a part of central Washington, an area that includes the city of Wenatchee and the towns of Entiat, Chelan, and Leavenworth. The Wenatchee aeromagnetic survey extends westward from the Columbia Plateau to the Cascade Range, and covers a part of the Columbia River and Lake Chelan. The survey was conducted between October 17 and December 5, 2011, by Firefly Aviation Ltd., working under contract to the U.S. Geological Survey. Total magnetic field values were acquired using a fixed-wing aircraft flown at a target elevation of 150 m above terrain and along flight lines and tie lines spaced 400 m and 4000 m apart, respectively. Flight lines were...
|
|
