Portland State University. Department of Geology
Ansel G. Johnson
Date of Award
Master of Science (M.S.) in Geology
1 online resource (90 p.)
Geology -- Oregon -- Tualatin River Valley, Faults (Geology) -- Oregon -- Tualatin River Valley, Seismic refraction method
The Tualatin Valley is a well defined elliptical basin centered at Hillsboro, with a major axis trending roughly N65°W. The valley is bordered on the northeast by the Tualatin Mountains (Portland Hills) which are a faulted, northwest-trending asymmetrical anticline. Topographic and geophysical evidence have defined the Portland Hills fault, which occurs along the northeast side of the Tualatin Mountains. The possibility that a fault or fault zone occurs along the southwest side of the Tualatin Mountains was investigated in this study.
Nazy, David John, "A seismic refraction study of a portion of the northeastern margin of the Tualatin Valley, Oregon" (1987). Dissertations and Theses. Paper 3723.