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The USGS and the Development of the Nevada Great Basin Community Velocity Model

The USGS and the Development of the Nevada Great Basin Community Velocity Model. Objectives. Help Coordinate efforts between UNLV, UNR, USGS, others, to develop a Community Velocity Model (CVM) patterned after Wasatch CVM effort Make CVM available to public when completed

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The USGS and the Development of the Nevada Great Basin Community Velocity Model

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  1. The USGS and the Development of theNevada Great Basin Community Velocity Model

  2. Objectives • Help Coordinate efforts between UNLV, UNR, USGS, others, to develop a Community Velocity Model (CVM) patterned after Wasatch CVM effort • Make CVM available to public when completed • Develop Urban Seismic Hazard Maps for Reno and Las Vegas Metropolitan Areas

  3. Seattle 3D Vs Velocity Model used in Seattle Urban Seismic Hazard Maps Vs (m/s) N USGS Open-File Report 2007-1175 http://pubs.usgs.gov/of/2007/1175

  4. Urban Seismic Hazard Map New map w/ ground motion simulation results (basin effects, rupture directivity, and nonlinear soil response at soft-soil sites) 2002 National Seismic Hazard Map w/ NEHRP Amplification factors based on Vs30 1 Hz S.A. (%g) with 2% Prob. Of Exceedance in 50 Years

  5. Information Important in Developing Community Velocity Models(not inclusive and area dependent) • Regional Geology (including basin Quaternary units and all active faults) • Realistic Basin Geometry (from gravity, seismic tomography, boreholes, etc.) • Geotechnical Data (borehole) • Geophysical Data (Vs, Vp, density, attenuation, etc.)

  6. Possible Steps for Research Community to Reach Objectives • Coordinate the compilation of all existing relevant data (how much data is there?) • Develop model with existing data (using searchable code (e.g. Wasatch CVM) , ModelAssembler, 3rd party 3D software) • Model validation (determine what additional data is needed, where is it most needed) • Acquire new data/incorporate into Model

  7. Funding (???) • Dependent on Funding levels from Congress • Historically, ~$120k has been available for these type of efforts every year in National/Intermountain West panels • Translates into ~1-2 proposals funded annually • USGS has historically collaborated on data acquisition with internal funding and anticipates doing so, if needed

  8. Wasatch Front Stacked Migrated Seismic Depth Section W E Processing Datum = 1450 m elevation 200 400 Depth (m) 600 800 1000 1200 Vertical exag. 2:1

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