ReMi Applied Geophysics Spring Break 2010

1. ReMi Applied GeophysicsSpring Break 2010 Fariha Islam Gretchen Schmauder

2. Question • Can the ReMi method be used to locate faults in the Reno Basin?

3. Area Geology • NE trending faults • Lacustrine, fluvial, and alluvial fan deposits • Tertiary volcanic basement • Active hot springs Abbott and Louie (2000)

4. 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.

5. 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.

6. ReMi Method Fundamental Mode Rayleigh Wave Transect 3 along lakeside dr.

7. ReMi Survey Transect 4 along lakeside dr.

8. Survey location Scott et al. (2004)

9. 20 Transects along Manzanita Ln and adjacent streets

10. First order: shear velocity correlates to surficial geology

12. Second order: shear velocity correlates to depth to bedrock Abbott and Louie (2000) Frary (2009)

13. Third order: correlation between shear velocity and faults?

14. 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

15. Further Work • Additional ReMi lines south of Manzanita Lane to verify higher velocity in alluvium • Better constraint on area faulting

16. references