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University of Nevada Nevada Seismological Laboratory Reno, Nevada seismo.unr

Preliminary Analysis of High-Resolution P-Wave Seismic Imaging Profiles Acquired Through Reno, Nevada, for Earthquake Hazards Assessment. Frary, R.N., Stephenson, W.J., Louie, J.N., Odum, J.K., Maharrey, J.Z., Dhar, M.S., Kent, R.L., Hoffpauir, C.G. Geologic Hazards Science Center

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University of Nevada Nevada Seismological Laboratory Reno, Nevada seismo.unr

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  1. Preliminary Analysis of High-Resolution P-Wave Seismic Imaging Profiles Acquired Through Reno, Nevada, for Earthquake Hazards Assessment Frary, R.N., Stephenson, W.J., Louie, J.N., Odum, J.K., Maharrey, J.Z., Dhar, M.S., Kent, R.L., Hoffpauir, C.G. Geologic Hazards Science Center U.S. Geological Survey Golden, Colorado http://earthquake.usgs.gov University of Nevada Nevada Seismological Laboratory Reno, Nevada http://seismo.unr.edu Network for Earthquake Engineering Simulation University of Texas Austin, Texas http://nees.utexas.edu

  2. Goals • Western Basin and Range Community Velocity Model • Reno-Carson City Urban Hazards Maps • Characterize Truckee Meadows Basin structure and fault locations

  3. Line Locations • TRK lines ~6.72 km MNZA line ~3.84 km map from GoogleEarth

  4. Comparison to Gravity Map M. Widmer, 2007

  5. Acquisition Parameters • Linear sweep 15-120 Hz • CMP (72-fold) acquisition • 2-second records • 5-m source and receiver spacing

  6. Truckee River Shot Record Time (us) Station 175

  7. Truckee River Processing • AGC (400 ms) • Bandpass filter (20-140 Hz) • Velocity analysis and residual statics • Post-stack finite difference time migration • FX deconvolution

  8. Truckee River Time-Migrated Section Preliminary Tie-in point between two profiles

  9. Truckee River Depth Migration Preliminary Tie-in point between two profiles

  10. Manzanita Shot Record Time (us) Station 461

  11. Manzanita Processing • AGC (400 ms) • Bandpass filter (20-140 Hz) • Velocity analysis and residual statics • Post-stack finite difference time migration • Eigenvector filter • Adaptive deconvolution

  12. Manzanita Time-Migrated Section Preliminary

  13. Manzanita Depth Migration Preliminary

  14. Further Investigation • Additional transects • Continued collaboration

  15. Acknowledgements • University of Nevada, Reno students • nees@UTexas • University of Nevada, Reno Dept. of Geological Sciences and Engineering • Mike Widmer, Washoe County Dept. of Water Resources

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