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.
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...
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....
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...
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,...
