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2016FallSymposiumURCreativityEngagement has ended
Tuesday, December 6 • 10:15am - 12:00pm
Fault-Slip History Along The Right-Lateral Indian Head Fault Within The Central Walker Lane, West-Central Nevada

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The Walker Lane is a zone of right-lateral (dextral) shear that is 700 km long and extends from eastern California into western Nevada, and north into northern California. The Pacific and North American tectonic plates move ~50 mm per year relative to each other and most of that motion is accommodated on the San Andreas fault. However, approximately 25% of fault-slip movement is accommodated by faults to the east of the San Andreas fault, including the Walker Lane. This study constrains the fault-slip history on the Indian Head fault within the Central Walker Lane. Through mapping various sized fault offsets of debris flows and beheaded streams both in the field and from aerial imagery, slip amounts were identified and measured. High-resolution digital elevation models (DEMs) were generated by Structure for Motion and used to make the offset measurements using a MATLAB GUI called LaDiCaoz. This work shows fault dextral offset amounts ranging from ~4 to 58.4 m along the Indian Head fault zone. Using field mapping and matching debris flows through point counts and fines samples of offset surfaces confirms the offset range of specific geomorphic features. Through reconstruction of displaced alluvial deposits and stream channels, strike-slip constraints have been defined along the Indian Head Fault at two sites. At the Mid site, offset alluvial deposits appear to be younger and have smaller offset amounts than the South site, which has the largest offset amounts and suggests that this site has older alluvial deposits and accumulated more displacement through more earthquakes.

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Tuesday December 6, 2016 10:15am - 12:00pm
Wilma Sherrill Center - Concourse

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