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Yousef Bozorgnia , Ph.D., P.E. PEER Associate Director

N ext G eneration A ttenuation Models for Central & Eastern US (NGA-East) Stakeholder Workshop: Introduction. Yousef Bozorgnia , Ph.D., P.E. PEER Associate Director. March 7, 2008. Acknowledgments. Nuclear Regulatory Commission (NRC) US Geological Survey (USGS)

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Yousef Bozorgnia , Ph.D., P.E. PEER Associate Director

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  1. Next Generation Attenuation Models for Central & Eastern US (NGA-East)Stakeholder Workshop: Introduction Yousef Bozorgnia, Ph.D., P.E. PEER Associate Director March 7, 2008

  2. Acknowledgments • Nuclear Regulatory Commission (NRC) • US Geological Survey (USGS) • National Institute of Standards & Technology (NIST)

  3. Agenda 9:00 Introduction (Yousef Bozorgnia) 9:15 NRC Perspective for NGA-East (Ann Kammerer, Jon Ake) 9:35 Need for NGA-East: National Hazard Maps for CEUS; Status, Plans, and Issues (Mark Petersen) 10:10 Need for NGA-East: EPRI CEUS Ground Motion Report; Summary and Issues (Norm Abrahamson) 10:45 Break 11:00 Need for NGA-East: Issues Related to Ground Motion Database for CEUS (Chris Cramer) 11:35 Need for NGA-East: Recent Developments in Ground Motion Simulations for CEUS (Paul Somerville/Rob Graves) 12:10 Lunch 1:10 Need for NGA-East: Recent Developments in Ground Motion Models for CEUS (Ken Campbell) 1:45 Review of Tentative Plan for NGA-East (Ann Kammerer, Jon Ake, Yousef Bozorgnia, Ken Campbell, Norm Abrahamson) 2:20 Discussions (All) 3:00 Adjourn

  4. Purpose of This Stakeholder Workshop • To give an overview of: • Current status of ground motion (GM) estimates in CEUS • Recent developments in GM predictions in CEUS • Tentative plan for NGA-East • To invite you to join NGA-East: • As a co-sponsor • In the planning phase, or technical phase

  5. Need for NGA-East • For CEUS, the attenuation models are a major source of uncertainty for seismic hazard calculations. This can be improved by: • Expanding a database of recorded ground motions recorded in, and simulated for, Stable Continental Regions • A coordinated effort to develop a consistent, yet independent, set of attenuation models for CEUS • Including supporting R&D efforts

  6. UC Santa Barbara UC Berkeley San Diego State U. USGS Student U. Nevada Private Industry Private Industry Caltrans USGS This Follows Successful Program of NGA-West • A multidisciplinary program, coordinated over five years • Bringing together: geologists, seismologists, geotechnical engineers, structural engineers, and users of ground motion models • Researchers, and practitioners

  7. Compiled One of the Largest Uniformly-Processed Strong-Motion Databases in the World • There are more than 100 variables describing source/path/site conditions of a record: • 6 types of distance measures • 4 site classification schemes • Estimated VS30 for most of recording sites • HW/FW classes The database is fully available to the public

  8. Magnitude range: • 5.0 - 8.0+ • Distance range: • 0 – 200 km • Fault Mechanism: • Strike-Slip • Reverse • Normal • Site Effects • Vs30 , Basin/Sediment depth NGA-West Attenuation Models • Ground motion parameters: • Horizontal components • PGA, PGV, PGD • Pseudo spectral acceleration • Period: 0 - 10 sec

  9. NGA-West & National Seismic Hazard Maps • USGS has extensively reviewed NGA, and is adopting the NGA models for the US National Seismic Hazard Maps

  10. Preliminary Map Period=1.0 sec Spectral Acceleration 2% P.E. in 50 years Ratio of New/Old: Using 3 NGA relations Versus: 2002 Hazard Maps Abrahamson and Silva (1997), Sadigh et al. (1997), Boore et al. (1997), Campbell and Bozorgnia (2003), Spudich et al. (1999) for extensional areas

  11. NGA-East • It is in the planning stage • There was one technical meeting • A List of many supporting R&D projects were compiled • There will be a public meeting in April/May • May/June, 2008, a “road map” report for NGA-East will be submitted to the NRC and other potential funding agencies

  12. NGA-East (cont’d) • The “road map” report will include: • A timeline for the overall NGA-East program (a five-year program) • List of supporting R&D projects • Estimated budget • …later today we will elaborate on tentative plan for NGA-East

  13. Agenda 9:00 Introduction (Yousef Bozorgnia) 9:15 NRC Perspective for NGA-East (Ann Kammerer, Jon Ake) 9:35 Need for NGA-East: National Hazard Maps for CEUS; Status, Plans, and Issues (Mark Petersen) 10:10 Need for NGA-East: EPRI CEUS Ground Motion Report; Summary and Issues (Norm Abrahamson) 10:45 Break 11:00 Need for NGA-East: Issues Related to Ground Motion Database for CEUS (Chris Cramer) 11:35 Need for NGA-East: Recent Developments in Ground Motion Simulations for CEUS (Paul Somerville/Rob Graves) 12:10 Lunch 1:10 Need for NGA-East: Recent Developments in Ground Motion Models for CEUS (Ken Campbell) 1:45 Review of Tentative Plan for NGA-East (Ann Kammerer, Jon Ake, Yousef Bozorgnia, Ken Campbell, Norm Abrahamson) 2:20 Discussions (All) 3:00 Adjourn

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