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

Publication Date

2020-04-14

Start Date

2013-05-17

End Date

2013-06-12

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, https://doi.org/10.5066/P9GRD5MX.

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.

• USGS Data Release Products