Date of Award:
5-2013
Document Type:
Thesis
Degree Name:
Master of Science (MS)
Department:
Geosciences
Department name when degree awarded
Geology
Committee Chair(s)
Susanne U. Janecke
Committee
Susanne U Janecke
Committee
James P. Evans
Committee
Anthony Lowry
Abstract
The Clark fault is a significant fault within the southern San Andreas fault system. The Clark fault abruptly ends where it intersects a second, smaller fault that crosses it called the Extra fault zone. In this study we investigate the possibility of the Clark fault continuing beneath and beyond the Extra fault zone. Based on field mapping and other geological data that we present, we determine that the Clark fault continues below the Extra fault and is not evident on the surface. Over time, earthquake slip along the Clark fault has caused the Extra fault zone to rotate in a clockwise direction. Both fault zones have high potential for causing a high magnitude (M >6.0) earthquake in the near future.
A second objective of this study is to identify the direction of motion along the Extra fault zone and related faults. Data collected from the field indicate that the fault is a strike-slip fault that moves in a left-lateral sense. Previously published geophysical data support our data collected in the field.
Checksum
7542fab23d3fdabd24d094f8240177e5
Recommended Citation
Thornock, Steven Jesse, "Southward Continuation of the San Jacinto Fault Zone through and beneath the Extra and Elmore Ranch Left-Lateral Fault Arrays, Southern California" (2013). All Graduate Theses and Dissertations, Spring 1920 to Summer 2023. 1978.
https://digitalcommons.usu.edu/etd/1978
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