Electromagnetic induction imaging (EMI) geophysical data collected at Bicycle Basin, Fort Irwin, California

This data release presents raw (.csv) and processed (.csv) data files from land-based, frequency-domain electromagnetic induction (EMI) data collected at Bicycle Basin, U.S. Army Fort Irwin National Training Center, California. Data were collected during three distinct time periods: March 19, 2008 (1 survey), December 1 to December 5, 2014 (46 surveys) and December 4 to December 8, 2015 (62 surveys). Data were collected by walking along survey lines throughout the airstrip region of the basin with the Geophex GEM-2 instrument at a height of approximately 1 meter above land surface in horizontal coplanar (ski flat) mode. The EMI data were used to map variations in subsurface electrical conductivity to investigate ground failures in the form of large surface cracks that have occured in the airstrip region of the basin, and to infer the possible occurence of voids in the subsurface that may pose risk of future ground failures. Data collection and analysis were funded by the U.S. Army Fort Irwin National Training Center, Directorate of Public Works via contract to the California Water Science Center of the U.S. Geological Survey, and subcontract to the Indiana Geological and Water Survey at Indiana University.