Extension between Major Faults, Central Oregon Basin and Range
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Date
2009-09
Authors
Treerotchananon, Anuwat, 1979-
Journal Title
Journal ISSN
Volume Title
Publisher
University of Oregon
Abstract
I present an alternative approach to determine the magnitude and direction of
extension in the Basin and Range Province at the north end of Summer Lake basin using
GIS techniques. Offset across 161 faults and tilting of 56 fault blocks were estimated to
calculate extension as a function of azimuth in this area. The orientation of a
representative set of slickenlines was collected in the field to assign average values for
the GIS analysis.
Azimuthal variation of extension is consistent with a strain ellipse indicating plane
strain with extension of 1.5 to 5.5 percent along the maximum extension direction of N75E
and no extension along the minimum N15W axis. Blocks tilt on average 60° from the
maximum extension direction, suggesting the underlying detachment dips -N15E. This
technique allows strain associated with the numerous small faults to be added to the sparse
large faults for a complete regional analysis.
Description
xi, 60 p. : ill. (some col.), maps (some col.). A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.
Keywords
Faults (Geology) -- Oregon -- Summer Lake Watershed