Aeromagnetic Data and horizontal gradient maxima of Garlock, California, and Surrounding Areas in California

This data release provides access to an aeromagnetic survey and magnetization boundaries over Garlock, California and surrounding areas in southern California. The survey extends from the city of Bakersfield across the southern Sierra Nevada and Tehachapi Mountains and west over Indian Wells Valley and the towns of Mojave and Rosamond to just northwest of the town of Barstow. These data were acquired between November 20, 2021 and January 17, 2022, by Eon Geosciences Inc., working under contract to the U.S. Geological Survey. The nominal flying height was based on a best fit, pre-planned, three-dimensional draped surface targeted at 305 m above terrain and a slope of 7%, subject to aircraft climb and descent limitations. Steep terrain in parts of the survey area required significant departures locally from the pre-planned drape surface (as much as 1752 m), and therefore variable terrain clearance should be considered when modeling and interpreting these data. Flight lines were spaced 600 m apart and directed east-west; tie lines were spaced 6000 m apart and directed north-south. A total of 26,712 line-kilometers were acquired over an area of approximately 14,800 square kilometers. The details of the Garlock aeromagnetic survey are described in the document Garlock_Tech_Report_508.pdf available for download in this data release. This report was prepared by Eon Geosciences Inc., and has not been edited. In addition, horizontal gradient maxima (garlock_mag_grad.csv) were calculated from the magnetic potential derived from these data to produce locations of crustal magnetization contrasts.