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Fault strip mapping and continued exploration of existing Traverse Ridge
Salient trenches and natural exposures along the Wasatch Fault
Utah Valley University’s 2013-2014 summer field classes
N. Toké, M. Arnoff, K. Carlson, M. Bunds, and J. Thomas.
Work Thus Far:
~10 km of Field and Remote Fault Strip Mapping with 2 m
AGRC LiDAR data…
• 2013 and 2014 UVU Field Camps ~ 2 weeks total
• Jason Thomas and N. Toke – 3 days field mapping +
GIS compilation
Preliminary Interpretation of ~6 Fault Exposures…
• Kade Carlson and N. Toke – T1S and T1N
• Mike Arnoff and N. Toke – T8
• N. Toke and Field Camp Students – T4, T6, and Arroyo
Exposures
2014
Bennett et al.,
Trench
2014
DuRoss et al.,
Trench
UVU Surface Break Mapping
• More than 100 Holocene surface breaks
• Lengths range from ~15 to ~500 m
• Most are between 40 and 200 m
• Typical fault zone width = ~500 m
• Step overs suggest RL slip component
Mapping from 2m slope shade
Overlain on 0.5m hillshade
RL Offsets?
RL Offset?
The E-W Trending Portion of the Wasatch Fault
reveals some evidence suggesting a right-lateral
component of slip.
The Area is abundant in Natural Exposures and
Left-open Exposures of the Fault
T1 North, West Wall
A
A
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T1 North, West Wall
2-3 Events, 0.5 – 1 m wedges
T1 South, East Wall
One Event with 1 - 1.5 m of displacement
Evidence of Faulting
Fault Dip-Aligned Tertiary Volcanics
Fault Gouge with faulted fabric
Thickened present dayA-horizon
….1 Recent Event?
• Deformed and displaced soil horizons.
• Buried A-horizon
• Possible, but unclear event evidence.
• Datable?
The Area is abundant in Natural Exposures and
Left-open Exposures of the Fault
Thus far, our mapping has only
extended to Box Elder Canyon…
Debris Flow Channel Fault Exposure (Trench 8 North Wall)
~0.5 meters
• Clear evidence of faulting
• Possible 0.5 m colluvial wedge
Box ElderArroyo Fault Exposure (South Wall)
~1 meter
• Pronounced Wedge
• Meter-scale Event
• Datable Material…
Future Work
• Get Ages for T1 Exposures
• Investigate T9 Exposure
• SFM of Box Elder Arroyo Walls – Ages?
• Revise Mapping with 0.5 m LiDAR
• Extend Mapping to American Fork Canyon
• Correlations with forthcoming USGS and UGS Results