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High-Resolution Aeromagnetic Survey of the Greater Spokane Area, Washington and Idaho


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Blakely, R.J., Sherrod, B.L., and Weaver, C.S., 2020, High-Resolution Aeromagnetic Survey of the Greater Spokane Area, Washington and Idaho: U.S. Geological Survey data release,


This data release provides access to a low-altitude, aeromagnetic survey of a part of eastern Washington and northwestern Idaho centered approximately at Spokane, Washington, and referred to as the Spokane aeromagnetic survey. The survey includes the cities of Spokane and Cheney, numerous smaller communities, and Fairchild Air Force Base. Magnetic anomalies reflect Miocene rocks of the Columbia River Basalt Group overlying Precambrian through Mesozoic basement rocks, including the Priest River metamorphic core complex. These data were acquired between May 17 and June 12, 2013, by EDCON-PRJ, Inc., working under contract to the U.S. Geological Survey. Total magnetic field values were acquired using a fixed-wing aircraft flown at a target [...]


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“Survey location map (jpg)”
thumbnail 1.13 MB
“Gridded data (gxf)”
5.75 MB
“Database (csv)”
643.8 MB
“Survey description (pdf)”
1.35 MB
“Database description (pdf)”
32.53 KB


These data were acquired to support earthquake hazard investigations and geologic mapping in eastern Washington and northwestern Idaho. The City of Spokane experienced more than 100 small earthquakes (magnitude 4 or less) over a 6-month period in 2001. The earthquakes were accompanied by approximately 15 mm of InSAR uplift. No faults are mapped beneath Spokane, but the earthquakes and uplift were consistent with a concealed, NE-striking reverse fault, referred to as the Spokane fault. The Spokane aeromagnetic survey was designed to illuminate the structure of the Spokane fault beneath the cover of Quaternary sediments. In addition to the Spokane fault, the survey also covers the north-northwest striking Latah fault, the Cheney fracture zone, and the westward projection of the St. Joe fault in Idaho. An interpretation of these data is presented in Blakely, R.J., Sherrod, B.L., Weaver, C.S., and Stephenson, W.J., 2015, The Spokane fault, Washington, imaged with high-resolution airborne magnetic data--implications for the 2001 Spokane earthquake sequence: American Geophysical Union Fall Meeting Abstracts, 2015AGUFMGP13B1296B.

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DOI doi:10.5066/P9GRD5MX

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