Aeromagnetic Data of Alturas, California, and Surrounding Areas

This data release provides access to an aeromagnetic survey over a part of northeastern California, an area that includes the city of Alturas, California. The survey extends across the Devils Garden part of the Modoc Plateau (west of the Warner Range) and westward to over Medicine Lake volcano. The survey covers the Likely fault zone, an enigmatic northwest-striking set of structures with possible Quaternary activity, and extends south across the Madelaine Plains. These data were acquired between September 24 and November 2, 2019, by EDCON-PRJ, 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, 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 911 m), and therefore variable terrain clearance should be considered when modeling and interpreting these data. Flight lines were spaced 800 m apart and directed east-west; tie lines were spaced 8000 m apart and directed north-south, except over the area of Medicine Lake volcano. In this area flight lines were spaced 400 m apart with tie lines spaced 4000 m apart. A total of 22,533 line-kilometers were acquired over an area of approximately 14,124 square kilometers. The details of the Alturas aeromagnetic survey are described in the document Alturas_Tech_Report_508.pdf available for download in this data release. This report was prepared by EDCON-PRJ, Inc., and has not been edited.

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