Airborne hunt for faults in the Portland-Vancouver area

Fact Sheet 105-96
Prepared in cooperation with the Oregon Department of Geology and Mineral Industries, Portland State University, Oregon State University, and Washington Division of Geology and Earth Resources
By: , and 



Geologic hazards in the Portland-Vancouver area include faults entirely hidden by river sediments, vegetation, and urban development. A recent aerial geophysical survey revealed patterns in the Earth's magnetic field that confirm the existence of a previously suspected fault running through Portland. It also indicated that this fault may pose a significant seismic threat. This discovery has enabled the residents of the populous area to better prepare for future earthquakes.

Suggested Citation

Blakely, R.J., Wells, R.E., Yelin, T.S., Stauffer, P.H., and Hendley, J.W., II, Airborne hunt for faults in the Portland-Vancouver area: U.S. Geological Survey Fact Sheet 105–96, 2 p. (Available at

ISSN: 2327-6932 (online)

Publication type Report
Publication Subtype USGS Numbered Series
Title Airborne hunt for faults in the Portland-Vancouver area
Series title Fact Sheet
Series number 105-96
DOI 10.3133/fs10596
Year Published 1996
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Earthquake Science Center
Description 2 p.
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