Shah, A. 20141124 Reston, VA U.S. Geological Survey https://doi.org/10.5066/F78K773V 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. The surveys were conducted from July 15, 2012 - July 25, 2012, by Sander Geophysics Limited. The area was flown along a draped surface with a nominal survey height above ground of 125 meters. The flight line spacing was 200 meters for traverse lines and 2000 meters for control lines. Here we present downloadable gravity, magnetic, and radiometric data from those surveys and summarize research results based on those datasets. The data are provided as image (GeoTiff or kmz), grid (gxf) or flight line (csv) data. Dissemination of airborne geophysical survey data collected near the 2011 moment magnitude 5.8 Mineral, Virginia (Louisa County) earthquake and summary of research results. These data should be cited as follows: Shah, A., 2014, Airborne Geophysical Surveys over the 2011 Mineral, Virginia, Earthquake Area: U.S. Geological Survey Data Release, https://doi.org/10.5066/F78K773V. Initial interpretation of gravity and magnetic data are 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 earthquake and its significance for seismic hazards in Eastern North America: Geological Society of America Special Paper 509. doi: 10.1130/2015.2509(17) Initial interpretation of radiometric data are provided by: Horton Jr., J.W., 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., M.C. Chapman, and R.A. Green, eds., The 2011 Mineral, Virginia earthquake and its significance for seismic hazards in Eastern North America, GSA Special Paper 509. doi: 10.1130/2015.2509(14) 20120715 20120725 ground condition Complete as needed 77.942528 77.762722 38.067361 37.745 None earthquake faults gravity magnetics radiometric data airborne geophysics subsurface imaging intraplate earthquakes USGS Metadata Identifier USGS:53e522c7e4b0fff404296e37 None Virginia Piedmont Mineral Louisa County United States of America none None. Users are advised to read the data set's metadata thoroughly to understand appropriate use and data limitations. Anjana K. Shah U.S. Geological Survey mailing and physical

DFC Bldg 20, Box 25046, Denver Federal Center, Mail Stop 964

Denver CO 80225 USA 303-236-1218 ashah@usgs.gov The surveys were funded by the U.S. Geological Survey Earthquake Hazards and National Cooperative Geologic Mapping Programs, Natural Hazards and Core Science Systems Mission Areas, Northeast Regional Office, and Crustal Geophysics and Geochemistry Science Center. The data were collected and processed by Sander Geophysics Limited. Anjana K. Shah J. Wright Horton Jr. William C. Burton David B. Spears Amy K. Gilmer 2015 https://doi.org/10.1130/2015.2509(17) J. Wright Horton Jr Martin C. Chapman Russell A. Green 2015 Geological Society of America Special Paper 509 J. Wright Horton Jr. Anjana K. Shah Daniel E. McNamara Stephen K. Snyder Aina M. Carter 2015 https://doi.org/10.1130/2015.2509(14) J. Wright Horton Jr Martin C. Chapman Russell A. Green 2015 Geological Society of America Special Paper 509 Attribute accuracy tests were completed for each of the three datasets (gravity, magnetic, radiometric) and are recorded in each metadata record. In addition further detail is described in the Survey Technical Report by Sander Geophysics at https://www.sciencebase.gov/catalog/item/53f5a9c9e4b09d12e0e86438 Tests for logical consistency between data attributes were performed where appropriate. Final data were also compared to previous regional datasets to check for consistency. Details of data processing for all three datasets can be found in the Survey Technical Report by Sander Geophysics Limited at https://www.sciencebase.gov/catalog/item/53f5a9c9e4b09d12e0e86438 Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. For details of positional accuracy tests conducted see the metadata for the three datasets (gravity, magnetic, radiometric). The Survey Technical Report by Sander Geophysics Limited at https://www.sciencebase.gov/catalog/item/53f5a9c9e4b09d12e0e86438 For details of positional accuracy tests conducted see the metadata for the three datasets (gravity, magnetic, radiometric). The Survey Technical Report by Sander Geophysics Limited at https://www.sciencebase.gov/catalog/item/53f5a9c9e4b09d12e0e86438 The Survey Technical Report by Sander Geophysics Limited describing data collection and processing in detail for the three datasets (gravity, magnetic, radiometric) can be found at https://www.sciencebase.gov/catalog/item/53f5a9c9e4b09d12e0e86438 Unknown DOI links in metadata file were updated from older to currrent format. 20260318 Universal Transverse Mercator 18 0.9996 -75.0 0.0 500000.0 0.0 row and column 23.927070933333 23.927070933333 Meter D_North_American_1983 GRS_1980 6378137.0 298.257222101 U.S. Geological Survey - ScienceBase mailing and physical

Denver Federal Center, Bldg 810, Mail Stop 302

Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Distributor assumes no liability for misuse of data. No warranty expressed or implied is made by the USGS regarding the use of the data on any other system, nor does the act of distribution constitute any such warranty. Gravity Data 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. Data include images (GeoTiff or kmz), grid (gxf) or flight line (csv) data. https://www.sciencebase.gov/catalog/item/53f59acee4b09d12e0e845ca none Magnetic Data 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. Data include images (GeoTiff or kmz), grid (gxf) or flight line (csv) data. https://www.sciencebase.gov/catalog/item/53f59abbe4b09d12e0e845c8 none Radiometric Data 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. Data include images (GeoTiff or kmz), grid (gxf) or flight line (csv) data. https://www.sciencebase.gov/catalog/item/53f59ad8e4b09d12e0e845cc none 20260318 Anjana K. Shah U.S. Geological Survey mailing and physical

DFC Bldg 20, Box 25046, Denver Federal Center, Mail Stop 964

Denver CO 80225 USA 303-236-1218 ashah@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998