Science for a changing world The USGS and the Development of the Nevada Great Basin Community Velocity Model.

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Presentation transcript:

Science for a changing world The USGS and the Development of the Nevada Great Basin Community Velocity Model

Science for a changing world 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

Science for a changing world USGS Open-File Report Seattle 3D Vs Velocity Model used in Seattle Urban Seismic Hazard Maps Vs (m/s) N

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

Science for a changing world 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.)

Science for a changing world 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, 3 rd party 3D software) Model validation (determine what additional data is needed, where is it most needed) Acquire new data/incorporate into Model

Science for a changing world 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

Science for a changing world

Wasatch Front Stacked Migrated Seismic Depth Section Processing Datum = 1450 m Vertical exag. 2:1 WE Depth (m) elevation

Science for a changing world