Filters: partyWithName: U.S. Geological Survey - ScienceBase (X) > partyWithName: Geology, Geophysics, and Geochemistry Science Center (X) > partyWithName: Anjana K Shah (X)
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Airborne magnetic data are provided here as part of the data release, 'Airborne magnetic and radiometric survey, Virginia and North Carolina Fall Zone, 2021.' This website includes the processed aeromagnetic data provided in an ascii .csv file and a geoTIFF image showing the total magnetic intensity. The contractor report is available on the parent page.
Categories: Data;
Types: Downloadable,
GeoTIFF,
Map Service,
Raster;
Tags: AASG,
Amelia County,
Association of State Geologists,
Bertie County,
Brunswick County,
Thirty-four ore, twenty-nine mine waste, seven host rock, two pegmatite, and one slag sample were collected from iron oxide-apatite (IOA) mines in the eastern Adirondack Highlands near Mineville and Ticonderoga, New York, from March 2016 to August 2018. The waste pile samples included twenty-five samples collected from rubble-sized mine waste piles and four samples from processed tailings piles. The ore from historic iron mines of the eastern Adirondack Highlands, New York, contain abundant quantities of rare earth element (REE)-bearing apatite crystals. These apatite crystals are especially enriched in Y, La, Ce, and Nd. In-ground ore, mine waste piles, and tailings piles could contain apatite...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Adirondack Mountains,
Energy Resources,
Geochemistry,
ICP-MS,
ICP-OES,
This directory contains a technical report by Sander Geophysics describing data collection and processing in detail. Note: The surveys were conducted from July 15, 2012 - July 25, 2012. The flight line spacing was 200 meters for traverse lines and 2000 meters for control lines. The area was flown along a draped surface with a nominal survey height above ground of 125 meters.
The grid provided here, "Levmag_UTM18N_50m.gxf", contains the magnetic anomaly after diurnal correction, IGRF removal, and leveling. Grids are in the ASCII grid exchange format (.gxf). Header information provides the grid dimensions, separation, coordinates and map projection, and z-value range information. The grid values follow. The projected coordinate system used for all grids is 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 information regarding data collection and processing can be found in the technical report. These data should be cited as follows: Shah, A.,...
This data release provides digital flight line data for a high-resolution airborne magnetic and radiometric survey over Charleston, South Carolina and the surrounding region. These data were collected to better understand earthquake hazards in the Charleston seismic zone by imaging structural features in the crystalline basement and to image heavy mineral sands containing titanium, zirconium, and rare earth elements using radiometric data (gamma spectrometry), which is sensitive to thorium in monazite. This survey represents a collaborative effort by the U.S. Geological Survey (USGS) Earthquake Hazards Program, Mineral Resources Program, National Cooperative Mapping Program, and Earth Mapping Resource Initiative...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Berkeley County,
Charleston,
Charleston County,
Clarendon County,
Colleton County,
Radiometric methods use gamma ray spectrometry to estimate relative amounts of potassium (K), uranium (U), and thorium (Th) in the upper 0.5-1 meter of Earth's crust. 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: Horton, J.W., Jr., Shah, A.K., McNamara, D.E., Snyder, S.L. and Carter, A.M., 2015, Aftershocks illuminate the 2011 Mineral, Virginia earthquake causative fault zone and nearby active faults, in Horton, J.W., Jr., Chapman, M.C., and Green, R.A., eds., The 2011 Mineral, Virginia earthquake...
Radiometric (gamma spectrometry) measurements were made during walking surveys in northern Maine using a GF Instruments Gamma Surveyor. These surveys involved recording measurement averages over 30-second intervals while holding the instrument approximately 1 meter above the ground. Locations were obtained via a handheld GPS. Data were collected over and in the vicinity of a radiometric thorium anomaly identified via an airborne survey. For more information on radiometric methods, please see the International Atomic Energy Agency publication "Guidelines for Radioelement Mapping Using Gamma Ray Spectrometry Data" (2003). Reference: International Atomic Energy Agency, 2003, Guidelines for Radioelement Mapping Using...
Categories: Data,
Data Release - Revised;
Tags: Aroostook County,
GGGSC,
Geology, Geophysics, and Geochemistry Science Center,
MRP,
Maine,
Airborne magnetic gradiometry data are provided here as part of the data release, "Airborne magnetic and radiometric survey, Columbia, South Carolina and surrounds, 2020." This website includes the processed aeromagnetic data provided in an ascii .csv file and a geoTIFF image showing the magnetic field intensity. The contractor report is available on the parent page. These data were collected as part of a high-resolution airborne magnetic and radiometric survey over Columbia, South Carolina and the surrounding region immediately northwest of an airborne magnetic and radiometric survey collected near Charleston, South Carolina in 2019 (Shah, 2020). Goals included imaging heavy mineral sands containing titanium,...
Categories: Data;
Types: Downloadable,
GeoTIFF,
Map Service,
Raster;
Tags: Aiken County,
Bamberg County,
Barnwell County,
Calhoun County,
Clarendon County,
Airborne radiometric data are provided here as part of the data release "Airborne magnetic and radiometric survey, Virginia and North Carolina Fall Zone, 2021." This website includes the processed aeroradiometric data (gamma spectrometry for K, U and Th) in an ascii .csv file and geoTIFF images showing the total count values and potassium, thorium, and uranium concentrations. The spectral data are provided in a netcdf file that can be reviewed using any freely available viewer (such as HDFview) or loaded using software or programming languages with netcdf support, such as GSPy for Python (Foks, 2022). The contractor report is available on the parent page. References: Foks, N.L., James, S. R., and Minsely, B....
Categories: Data;
Types: Downloadable,
GeoTIFF,
Map Service,
Raster;
Tags: AASG,
Amelia County,
Association of State Geologists,
Bertie County,
Brunswick County,
Airborne magnetic surveys were conducted in Oklahoma from August 11th, 2017-October 28th, 2017, by Goldak Airborne Surveys. Here we present downloadable flight line data from those surveys in comma-separated values (csv format). Three areas were flown along a draped surface with a nominal survey height above ground of 120 meters. The flight line spacing for these areas was 200 to 400 m for Area 123, in southwestern Oklahoma; 1000 m for Area 4, in northwestern Oklahoma, and 800 m for Area 5, in north-central Oklahoma. For each area control lines were flown at ten times the traverse line spacing. The surveys were flown to map subsurface geologic variations including ancient magmatic bodies, faults, and other geologic...
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Airborne geophysics,
GGGSC,
Geologic framework studies,
Geology, Geophysics, and Geochemistry Science Center,
Geophysics,
Petrophysical data were collected in the eastern Adirondack Highlands during several field campaigns in 2016-2017. This data release provides magnetic susceptibility, gamma spectrometry, and density measurements on rock outcrops, hand samples, and during walking surveys. Rock types for the outcrops and samples were identified using standard field methods. Locations of the outcrops or samples were determined using a handheld GPS.
Line data are presented as comma separated values (csv) with the following definitions: LINE Flight line number DIR Flight line direction, degrees clockwise from North DATE Year / Julian day TIME Time (UTM, 24-hour) hh:mm:ss LONG Longitude, WGS84 (degrees) LAT Latitude WGS84 (degrees) x_UTM18N Easting, UTM Zone 18N (meters) y_UTM18N Northing, UTM Zone 18N (meters) RALT Radar altimeter height (meters) BALT Barometric altimeter height (meters) LALT Laser altimeter height (meters) GPSZ GPS elevation above GRS-80 ellipsoid RAWMAG Raw, compensated total magnetic intensity (nT) DMAG Diurnally corrected total magnetic intensity (nT)...
Gravity measurements indicate subtle differences in the density of rocks in Earth's crust. The gravity anomaly can be used to indirectly map the distribution of different rock types. 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, in Horton, J.W., Jr., Chapman, M.C., and Green, R.A., eds., The 2011 Mineral, Virginia...
The grids provided here are: "FAA_1000_UTM18N_NAD83.gxf" : Gravitational Free-air anomaly (mGal) with a 1-km half-wavelength grid filter "BA_267_1000_UTM18N_NAD83.gxf": the Bouguer anomaly (mGal) derived from the above free-air anomaly assuming a reference density of 2.67 g/m3. Grids are in the ASCII grid exchange format (.gxf). Header information provides the grid dimensions, separation, coordinates and map projection, and z-value range information. The grid values follow. The projected coordinate system used for all grids is 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...
The 2011 Moment Magnitude 5.8 Mineral, Virginia earthquake was felt by tens of millions of people and caused significant damage in the eastern United States. As part of efforts to better understand the faults, mechanisms and geology associated with the earthquake, the U.S. Geological Survey commissioned airborne geophysical surveys over the epicentral area. Here we summarize research results based on those datasets. Additional background information can be found in this article by Horton and Williams (2012) published in EOS. Research results have been published in the Geological Society of America Special Paper The 2011 Mineral, Virginia, Earthquake, and Its Significance for Seismic Hazards in Eastern North America....
Airborne Geophysical Surveys over the 2011 Mineral, Virginia, Earthquake Area The 2011 moment magnitude (Mw) 5.8 central Virginia earthquake was felt by millions of people and caused significant damage in the eastern United States. As part of efforts to better understand the faults and geologic features associated with the earthquake, the U.S. Geological Survey commissioned airborne geophysical surveys over the epicentral area. Here we present the data from those surveys and summarize research results based on those datasets. The following items can be obtained by following links on this page: - Background information on the Mineral, Virginia earthquake and a summary of first analysis results - Downloadable...
Categories: Data,
Publication;
Types: Citation,
Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: USGS Science Data Catalog (SDC)
The grids provided are: "K_UTM18N_NAD83.gxf": Corrected potassium (%) "eU_UTM18N_NAD83.gxf": Corrected equivalent uranium (ppm) "eTh_UTM18N_NAD83.gxf": Corrected equivalent thorium (ppm) "Total_Count_UTM18N_NAD83.gxf": Total count (counts/sec) Grids are in the ASCII grid exchange format (.gxf). Header information provides the grid dimensions, separation, coordinates and map projection, and z-value range information. The grid values follow. The grid coordinate system used for all grids is 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 information regarding data collection...
Line data are presented as comma separated values (csv) with the following definitions: LINE Flight line number DIR Flight line direction, degrees clockwise from North DATE Year / Julian day TIME Time (UTM, 24-hour) hh:mm:ss LONG Longitude, WGS84 (degrees) LAT Latitude WGS84 (degrees) x_UTM18N Easting, UTM Zone 18N (meters) y_UTM18N Northing, UTM Zone 18N (meters) RALT Radar altimeter height (meters) LALT Laser altimeter height (meters) MSL GPS elevation, final (orthometric MSL - NAVD88 using GEOID09) (meters) DEM Digital elevation model (meters) FGRAVFL15 Levelled free air gravity, 15 s half-wavelength filter, 1,000 m half-wavelength...
This data release provides digital flight line data for a high-resolution airborne magnetic and radiometric survey over Virginia and North Carolina along and near the eastern U.S. 'Fall Zone', which represents the transitional area between Atlantic Coastal Plain sediments and Piedmont metamorphic and igneous rocks. The airborne data collection was funded by the U.S. Geological Survey (USGS) Earth Mapping Resources Initiative (Earth MRI) and National Cooperative Geological Mapping Program (NCGMP). Goals include a gaining a better understanding of placer deposits containing critical mineral resources titanium, zirconium, and rare earth elements, assisting geologic mapping of the crystalline basement either exposed...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: "Geophysics",
"Mineral Resources",
"Sedimentology"],
"Structural Geology",
AASG,
Line data are presented as comma separated values (csv) with the following definitions: LINE Flight line number DATE Year / Julian day TIME Time (UTM, 24-hour) hh:mm:ss LONG Longitude, WGS84 (degrees) LAT Latitude WGS84 (degrees) x_UTM18N Easting, UTM Zone 18N (meters) y_UTM18N Northing, UTM Zone 18N (meters) RALT Radar altimeter height (meters) LALT Laser altimeter height (meters) BARALT Barometric altimeter height (meters) MSL GPS elevation, final (orthometric MSL - NAVD88 using GEOID09) TEMP Temperature (Celsius) TOTAL Corrected total count (counts/second) CONC_K Corrected potasssium...
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