Puget Sound Aeromagnetic Maps and Data

By Richard J. Blakely1, Ray E. Wells1, and Craig S. Weaver2

U.S. Geological Survey Open-File Report 99-514
Version 1.0



Charles G. Groat, Director

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey (USGS) editorial standards or with the North American Stratigraphic Code. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025
2U.S. Geological Survey, Univ. of Washington, Box 351650, Seattle, WA 98195

Summary: This report describes and provides access to aeromagnetic data acquired in 1997 over the Puget Sound, Washington. The aeromagnetic survey was the centerpiece project of the 1997 Puget Sound Urban Hazards Initiative and a cooperative effort between the Urban Hazards Initiative, the National Cooperative Geologic Mapping Program, and the National Earthquake Hazards Reduction Program. The survey was conducted by a private company under contract to the U.S. Geological Survey. It covers an area of about 12,000 square miles, extending from the Canadian border to south of Olympia and including the cities of Seattle, Tacoma, Everett, Bremerton, Olympia, and Bellingham. The aircraft flew along parallel lines spaced 0.25 miles apart (a total distance of 43,000 miles) and at an altitude as low as permitted by safety considerations, generally only 800 feet above the ground. Interpretation of these aeromagnetic data, in conjunction with other geologic and geophysical information, will provide critical first-order information needed to assess the earthquake hazards posed by crustal faults in the Puget Lowland region. This page also provides links where large-scale maps (PDF format) and digital data (GXF format) can be obtained directly.


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Version history

To contact the senior author, email Richard Blakely (blakely@usgs.gov).

URL: https://pubs.usgs.gov/of/1999/of99-514
Maintained by:
Michael F. Diggles
Last modified: December 9, 2005