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ReMi Applied Geophysics Spring Break 2010. Fariha Islam Gretchen Schmauder. Question. Can the ReMi method be used to locate faults in the Reno Basin?. Area Geology. NE trending faults Lacustrine, fluvial, and alluvial fan deposits Tertiary volcanic basement Active hot springs.
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ReMi Applied GeophysicsSpring Break 2010 Fariha Islam Gretchen Schmauder
Question • Can the ReMi method be used to locate faults in the Reno Basin?
Area Geology • NE trending faults • Lacustrine, fluvial, and alluvial fan deposits • Tertiary volcanic basement • Active hot springs Abbott and Louie (2000)
Project Constraints • Sedimentary cover can be greater than 1000 meters thick (Abbott and Louie, 2000). • ReMi method typically used to depths less than 100 meters.
ReMi Method • Surface wave velocity spectral analysis used to determine shallow earth structures • Typically used to determine IBC site classification, rippability, void detection, and fault mapping.
ReMi Method Fundamental Mode Rayleigh Wave Transect 3 along lakeside dr.
ReMi Survey Transect 4 along lakeside dr.
Survey location Scott et al. (2004)
Second order: shear velocity correlates to depth to bedrock Abbott and Louie (2000) Frary (2009)
Conclusions • Transect velocity models reflect regional geology and depth to bedrock • Correlation between velocity models and faults is inconclusive • Indication that the alluvium has a lower shear velocity due to faulting
Further Work • Additional ReMi lines south of Manzanita Lane to verify higher velocity in alluvium • Better constraint on area faulting