U.S. Department of the Interior U.S. Geological Survey 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. University of Nevada Nevada Seismological Laboratory Reno, Nevada Geologic Hazards Science Center U.S. Geological Survey Golden, Colorado Network for Earthquake Engineering Simulation University of Texas Austin, Texas

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

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

Comparison to Gravity Map M. Widmer, 2007

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

Truckee River Shot Record Time (us) Station 175

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

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

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

Manzanita Shot Record Time (us) Station 461

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

Manzanita Time-Migrated Section Preliminary

Manzanita Depth Migration Preliminary

Further Investigation  Additional transects  Continued collaboration

Acknowledgements  University of Nevada, Reno students   University of Nevada, Reno Dept. of Geological Sciences and Engineering  Mike Widmer, Washoe County Dept. of Water Resources