Filters: partyWithName: Anjana K Shah (X)
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In response to Executive Order 13817 of December 20, 2017, the U.S. Geological Survey (USGS) coordinated with the Bureau of Land Management (BLM) to identify 35 nonfuel minerals or mineral materials considered critical to the economic and national security of the United States (U.S.). Acquiring information on possible domestic sources of these critical minerals is the basis of the USGS Earth Mapping Resources Initiative (Earth MRI). The program, which partners the USGS with State Geological Surveys, federal agencies, and the private sector, aims to collect new geological, geophysical, and topographic (lidar) data in key areas of the U.S. to stimulate mineral exploration and production of critical minerals. The first...
Categories: Data;
Types: ArcGIS REST Map Service,
ArcGIS Service Definition,
Downloadable,
Map Service;
Tags: Alabama,
Alaska,
Arizona,
Arkansas,
California,
Magnetic anomaly measurements indicate variations in the intensity of Earth's magnetic field. These variations are generated by differences in magnetic minerals such as magnetite and hematite in Earth's crust, and can be used to indirectly infer differences in rock composition. Please follow links on this page to download image (GeoTiff or kmz), grid (gxf) or flight line (csv) data Detailed information regarding data collection and processing can be found in the technical report. Initial interpretation of this dataset is provided by: Shah, A.K., Horton, J.W., Jr., Burton, W.C., Spears, D.B. and Gilmer, A.K. 2015, Subsurface geologic features of the 2011 central Virginia earthquakes revealed by airborne geophysics,...
Images here include: TotCount_UTM18N_NAD83 (GeoTiff, KMZ): Total count TotCount_Contour250CPS_UTM18N_NAD83 (GeoTiff, KMZ): Total count with 250 counts/sec contours TotalCount_Colorbar.png provides a colorbar key for the total count images. Ternary_K_U_Th_UTM18N (GeoTiff, KMZ): Ternary image showing relative values of K, eU, and eTh. Ternary_Key.png provides a color key for the ternary image. Images may be geo-registered using embedded projection information in both the tiff and kmz files. Each image is projected using UTM Zone 18N: Datum: NAD83 Base Latitude: 0.00 degrees Central Meridian: -75.00 degrees False Easting: 500,000 meters False Northing: 0 meters Scale factor at natural origin: 0.9996 Detailed...
Images provided here include: MagAnom_UTM18N_NAD83 (GeoTiff, KMZ): Magnetic anomaly corrected for diurnal variations, IGRF removed, and leveled MagAnomContour50nT_UTM18N_NAD83 (GeoTiff, KMZ): Magnetic anomaly corrected for diurnal variations, IGRF removed, and leveled, 50 nT contours. MagAnomShaded_UTM18N_NAD83 (GeoTiff, KMZ): Shaded relief image of magnetic anomaly corrected for diurnal variations, IGRF removed, and leveled. Illumination is from the west. MagAnom_Colorbar.png provides a colorbar key for these magnetic anomaly images. Images may be geo-registered using embedded projection information in both the tiff and kmz files. Each image is projected using UTM Zone 18N: Datum: NAD83 Base Latitude: 0.00...
This data release provides digital flight line data for a high-resolution airborne magnetic and radiometric survey over Columbia, South Carolina, and the surrounding region. The airborne data collection was funded by the U.S. Geological Survey (USGS) Earth Mapping Resource Initiative (Earth MRI) with goals of better understanding placer deposits containing critical mineral resources titanium, zirconium, and rare earth elements and of imaging the crystalline basement partly buried beneath Atlantic Coastal Plain sediments. The survey was flown northwest of and slightly overlapping an airborne magnetic and radiometric survey collected in 2019 (Shah, 2020). The northwestern boundary of the 2020 survey lies within the...
Categories: Data;
Types: Downloadable,
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OGC WFS Layer,
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Tags: <1-10GB,
Aiken County,
Bamberg County,
Barnwell County,
Calhoun County,
This data release provides digital flight line data for a high-resolution airborne magnetic and radiometric survey over parts of northern Maine. The airborne data collection was funded by the U.S. Geological Survey (USGS) Earth Mapping Resource Initiative (Earth MRI) with goals of better understanding volcanogenic massive sulfide mineral deposits, sediment hosted manganese deposits, and their surrounding geologic framework. Data for this survey were collected and processed by Sander Geophysics under contract with the USGS. The airborne survey took place June-July 2021. Using a fixed wing aircraft with a magnetometer mounted in a tail stinger and a fully calibrated gamma ray spectrometer, data were collected along...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: "Geophysics"],
Allagash Lake,
Aroostook County,
Aroostook River,
Bever Brook,
Images provided here include: FAA_UTM18N_NAD83 (GeoTiff, KMZ): Free-air anomaly with a 1-km grid filter FAA_Cont1mGal_UTM18N_NAD83 (GeoTiff, KMZ): Free-air anomaly with a 1-km grid filter, 1 mGal contours FAA_Colorbar.png provides a colorbar key for these free-air anomaly images. BA_267_UTM18N_NAD83 (GeoTiff, KMZ): Bouguer anomaly derived from the free-air anomaly with a 1-km grid filter, assuming a uniform density of 2.67 g/m3 BA_267_Cont1mGal_UTM18N_NAD83 (GeoTiff, KMZ): Bouguer anomaly derived from the free-air anomaly with a 1-km grid filter, assuming a uniform density of 2.67 g/m3, 1 mGal contours BA_Colorbar.png provides a colorbar key for these Bouguer anomaly images. Images may be geo-registered...
Seismic hazard assessments depend on an accurate prediction of ground motion, which in turn depends on a base knowledge of three-dimensional variations in density, seismic velocity, and attenuation. The datasets here are components of a National Crustal Model that couples geologic characteristics and geophysical parameters using a physical theoretical foundation combined with measured data for calibration. The model is intended to be internally consistent and seamless on a national scale; care is also taken to maximize consistency with existing regional models. An initial version of the model components are defined for the western U.S. on a 1-km grid. While the current focus of this effort is on improving estimates...
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