Research Geophysicist
Email:
tien@usgs.gov
Office Phone:
303-236-1393
Fax:
303-236-1425
ORCID:
0000-0002-0761-3489
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This data release provides digital flight-line and gridded data for a high-resolution airborne magnetic and radiometric survey over the region surrounding the Wet Mountains of southern Colorado, including parts of Custer and Fremont Counties. Data for this survey were collected by Sander Geophysics Limited International (SGL) under contract with the USGS. The survey was flown in June and July of 2021 using a helicopter equipped with a magnetometer mounted in a stinger extending from the nose of the aircraft and a gamma-ray spectrometer stowed onboard. The helicopter pilots followed pre-planned flight paths in a grid-like pattern, with east-west lines spaced 150 meters apart and north-south lines spaced 1,000 meters...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: "Mineral Resources"],
AASG,
Antelope Creek,
Arkansas River,
Association of State Geologists, All tags...
Canon City,
Colorado,
Custer County,
Earth Mapping Resources Initiative,
EarthMRI,
Economic Geology,
Fremont County,
GGGSC,
Geology, Geophysics, and Geochemistry Science Center,
Geophysics,
Grape Creek,
MRP,
Mineral Resources,
Mineral Resources Program,
National Cooperative Geologic Mapping Program,
North Hardscrabble Creek,
Oak Creek,
Rosita Hills,
Royal Gorge,
Sedimentology,
Sliver Cliff,
Structural Geology,
Tallahassee Creek,
Texas Creek,
U.S. Geological Survey,
USA,
USGS,
USGS Science Data Catalog (SDC),
United States,
United States of America,
Westcliffe,
Wet Mountain Valley,
Wet Mountains,
["Geophysics",
aeromagnetic surveying,
aeroradiometric surveying,
airborne geophysical survey,
economy,
geophysics,
geoscientificInformation,
geospatial datasets,
magnetic field (earth),
potassium,
south-central Colorado,
thorium,
uranium, Fewer tags
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New land-bathymetry and land-lake surface elevation models were produced for the Lake Superior region. The models combine Shuttle Radar Topography Mission (SRTM) topography data with lake surface elevation and bathymetry data sets for Lakes Superior, Michigan, and Huron. The SRTM data set was chosen because it spans the international border and has relatively high resolution at 30 m cell size. These data were subsequently used for aeromagnetic data processing and gravity data reduction.
Types: Citation;
Tags: Great Lakes,
Lake Superior,
Michigan,
Minnesota,
Ontario, All tags...
Wisconsin,
bathymetry,
elevation,
geoscientificInformation,
topography, Fewer tags
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Samples, sample depths, paleomagnetism, and magnetic susceptibility parameters are recorded for BP-3-USGS well, San Luis Valley, Southwestern Colorado.
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Radiometric data collected as part of a high-resolution airborne magnetic and radiometric survey over the southwest portion of the Colorado Mineral Belt in southwestern Colorado are provided as digital flight-line and grid files. Radiometric (or gamma-ray) surveys measure naturally occurring low-level radiation and are sensitive to the presence of rocks within 30 cm of the surface that are enriched in uranium, thorium, or potassium. Data for this survey were acquired by NV5 Geospatial, Inc. and its sub-contractors Precision GeoSurveys, Inc. and EDCON-PRJ, Inc under contract with the USGS. The survey was flown in September and October of 2023 using a helicopter equipped with a gamma-ray spectrometer stowed onboard....
Categories: Data;
Types: Downloadable,
GeoTIFF,
Map Service,
Raster;
Tags: AASG,
Aeroradiometric survey,
Airborne geophysical survey,
Association of State Geologists,
Colorado, All tags...
Colorado Mineral Belt,
Creede,
Delores,
Durango,
Earth Mapping Resources Initiative,
EarthMRI,
Economic Geology,
GGGSC,
Geology, Geophysics, and Geochemistry Science Center,
Geophysics,
Geospatial datasets,
Hinsdale,
LaPlata,
Lake City,
MRP,
Mineral,
Mineral Resources,
Mineral Resources Program,
Montezuma,
National Cooperative Geologic Mapping Program,
Ouray,
Potassium,
San Juan,
San Miguel,
Sedimentology,
Silverton,
Structural Geology,
Telluride,
Thorium,
U.S. Geological Survey,
USA,
USGS,
United States,
United States of America,
Uranium, Fewer tags
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New gravity compilation has been compiled for the Lake Superior region. The gravity compilation includes survey stations available from Natural Resources Canada, National Centers for Environmental Information (formerly National Geophysical Data Center), Minnesota Geological Survey, and U.S. Geological Survey. Individual databases were combined and duplicates were removed resulting in a database of 63,880 gravity stations. The gravity station data were reprocessed from observed gravity to simple Bouguer anomaly following standard methods that depend on the station type (for example, land, lake surface, or lake bottom observation) and used a reduction density of 2,670 kg/m3. The compilation provides a consistent dataset...
Categories: Data;
Types: Citation;
Tags: Great Lakes,
Lake Superior,
Michigan,
Minnesota,
Ontario, All tags...
Wisconsin,
bouguer anomaly,
free-air anomaly,
geoscientificInformation,
gravimeter measurement,
gravitational field (earth), Fewer tags
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