Research Geophysicist
Geology, Geophysics, and Geochemistry Science Center
Email:
tien@usgs.gov
Office Phone:
303-236-1393
Fax:
303-236-1425
ORCID:
0000-0002-0761-3489
Supervisor:
Paul A Bedrosian
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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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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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This data release includes data collected from the Villa Grove helicopter magnetic survey in northern San Luis Valley and Poncha Pass region in south-central Colorado, USA. The survey area extends over the northern part of Great Sand Dunes National Park, Poncha Pass and vicinity, and into the southern end of the Upper Arkansas Valley. It includes the communities of Crestone, Villa Grove, Saguache, and Salida. Several U.S. Geological Survey programs (including the National Cooperative Geologic Mapping Program, Mineral Resources Program, and Geothermal Program), as well as the Colorado Geological Survey, funded the survey. The data are part of studies to help refine our knowledge in this area about the nature of aquifers,...
Categories: Data;
Types: Downloadable,
GeoTIFF,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Raster,
Shapefile;
Tags: Chaffee County,
City of Salida,
Colorado,
Crestone,
Fremont County, All tags...
GGGSC,
Geology, Geophysics, and Geochemistry Science Center,
Geophysics,
Great Sand Dunes National Park,
MRP,
Minerals Resources Program,
Poncha Pass,
Saguache,
Saguache County,
San Luis Creek,
San Luis Valley,
USGS Science Data Catalog (SDC),
Villa Grove,
aeromag,
aeromagnetic,
aeromagnetic surveying,
airborne magnetic survey,
geophysics,
geoscientific information,
geospatial datasets,
magnetic field (earth),
magnetic surveying, Fewer tags
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