Dissertation/Thesis Abstract

Tectonic geomorphology of quaternary river terraces at Santa Cruz Creek, Santa Maria Basin, Santa Barbara County, California
by Tyler, Edward P., M.S., California State University, Long Beach, 2013, 162; 1527759
Abstract (Summary)

Geomorphologic methods document poorly exposed tectonically active structures in the first study to determine quantified ages for Quaternary Age fluvial terraces at Santa Cruz Creek. GPS surveys of three flights of terrace surfaces and a stream gradient profile reveal deformation at the Baseline/Los Alamos fault zone and Little Pine fault. Optically Stimulated Luminescence (OSL) dating was employed to determine ages for the terraces. The formation age of Terrace 1 is 19.3 ka with an incision rate of 1.63 to 1.82 mm/yr, Terrace 2 was dated at 32.9 ka with incision rate of2.02 to 1.82 mm/yr. Based on incision rates an estimated age of 44.0-47.0 ka was calculated for Terrace 3. Offsets in T-2 and T-3 were used to calculate a short term faulting rates of .91 mm/yr and a long term faulting rate of 0.67 to 0. 73 mm/yr for the Baseline/Los Alamos fault.

Indexing (document details)
Advisor: Onderdonk, Nathan
School: California State University, Long Beach
Department: Geologic Science
School Location: United States -- California
Source: MAI 52/06M(E), Masters Abstracts International
Subjects: Geographic information science, Geology, Geomorphology
Keywords: Basline/los alamos fault, Faulting rate, Little pine/pine mountain fault, Optically stimulated luminescence dating, Santa maria basin, Tectonic geomorphology
Publication Number: 1527759
ISBN: 978-1-303-92615-0
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