Next Generation Attenuation for Central and Eastern North America (NGA-East)
SSHAC Workshop 2 – Proponent Discussions and Remaining Critical Issues and Data Needs
July 14-16, 2014
With funding from the US Nuclear Regulatory Commission (NRC), Electric Power Research Institute (EPRI) and US Department of Energy, the Pacific Earthquake Engineering Research Center (PEER) is coordinating a comprehensive multidisciplinary program to develop Next Generation Attenuation Relationships for the Central and Eastern North-America (NGA-East).
NGA-East is Ground Motion Characterization (GMC) project and follows the SSHAC (Senior Seismic Hazard Analysis Committee) Level 3 process. See the Open-File Report 2009-1093 (PDF file – 992 KB) for a summary of the SSHAC process.
PDFs of all presentations & videos
July 14, 2014 Monday
| 8:30-8:35 | Introduction (Y. Bozorgnia) |
| 8:35-9:00 | Project status, project plan (C.Goulet) |
| 9:00-9:05 | Notes on residuals notation (C.Goulet) |
| 9:05-9:50 | NGA-East approach for median GMPEs in Fourier spectral space: summary and key issues (N. Abrahamson/J. Hollenback) |
| 9:50-10:05 | GMPE development: Kappa estimation and related issues (O. Ktenidou) |
| 10:05-10:20 | Break |
| 10:20-10:40 | GMPE development: duration model for empirical FAS (N. Kuehn) |
| 10:40-10:55 | GMPE development: duration model for SMSIM point source model (D. Boore) |
| 10:55-12:05 | Discussions on GMPE development |
| 12:05-13:05 | Lunch |
| 13:05-13:25 | Database: summary, status and ground motion products (T. Kishida) |
| 13:25-13:35 | Database: source metadata (B. Youngs) |
| 13:35-13:50 | Database: station metadata (Y. Hashash) |
| 13:50-14:15 | Discussions on database issues |
| 14:15-14:55 | Regionalization: summary of regionalization tasks and simulation results, proposed regions (G. Atkinson, W. Mooney, M. Chapman) |
| 14:55-15:30 | Regionalization: depth-dependent stress-parameter (R. Graves, J. Boatwright) |
| 15:30-15:45 | Break |
| 15:45-16:00 | Discussions on Regionalization |
| 16:00-16:15 | Paths contained in CENA regions (C. Goulet) |
| 16:15-16:45 | Preliminary treatment of the Gulf Coast/Mississippi Embayment, reference velocity and kappa adjustments (M. Chapman) |
| 16:45-17:10 | Discussions on treatment of Gulf Coast |
| 17:10-17:25 | Summary of the day |
| 17:25-17:35 | Observers comments |
Monday, July 14, 2014 – Morning presentations
Monday, July 14, 2014 – Afternoon presentations
July 15, 2014 Tuesday
| 8:00-8:05 | Introduction |
| 8:05-8:35 | Epistemic uncertainty: previous approaches (N. Abrahamson) |
| 8:35-9:35 | Epistemic uncertainty: proposed approach and application to NGA-East (N. Kuehn) |
| 9:35-9:50 | Break |
| 9:50-11:30 | Discussions on epistemic uncertainty |
| 11:30-12:15 | Simulations: validation exercise, finite-fault (FF) methods (C. Goulet) |
| 12:15-13:15 | Lunch |
| 13:15-14:00 | Simulations: methods selected, FF and point source (PS) (D. Dreger) |
| 14:00-14:20 | Discussions on FF validation and methods |
| 14:20-14:50 | Simulations: focus on validation for CENA. Results summary for Mineral, Riviere-du-Loup and Saguenay (C. Goulet), Saguenay modeling details (R. Graves) |
| 14:50-15:05 | Break |
| 15:05-15:15 | Simulations: forward runs (FF and PS) Source input: CEUS SSC Summary (B. Youngs) |
| 15:15-15:35 | Simulations: forward runs (FF and PS) Source input: stress drop and magnitude (A. Baltay) |
| 15:35-15:55 | Simulations: forward runs (FF) Source input: M-A relationships and randomization of source (R. Graves) |
| 15:55-16:15 | Simulations: forward runs (FF Green’s functions) Path input: crustal models importance within 70 km (R. Graves) |
| 16:15-16:35 | Simulations: forward runs (stochastic and hybrid) Path input: geometrical spreading, Q, duration (G. Atkinson) |
| 16:35-17:05 | Discussions on forward simulations |
| 17:05-17:20 | Summary of the day |
| 17:20-17:30 | Observers comments |
Tuesday, July 15, 2014 – Morning presentations
Tuesday, July 15, 2014 – Afternoon presentations
July 16, 2014 Wednesday
| 8:00-8:05 | Introduction |
| 8:05-8:50 | GMPEs, proponent model(s): summary of EPRI (2004-2006) Review Project model(s) (R. Youngs) |
| 8:50-9:20 | GMPEs, proponent model: Cramer and Al Norman ENA empirical model (C. Cramer) |
| 9:20-9:50 | GMPEs, proponent model: Preliminary Graizer-14 GMPE for CEUS (V. Grazier) |
| 9:50-10:05 | Break |
| 10:05-10:35 | GMPEs, proponent approach: hybrid empirical models (K. Campbell) |
| 10:35-11:05 | GMPEs, proponent approach: NGA-East approach for standard deviation modeling (L. Al Atik) |
| 11:05-11:35 | Discussions |
| 11:35-11:45 | Summary of the day |
| 11:45-11:55 | Observers comments |
| 11:55-12:00 | Final remarks (Y. Bozorgnia) |
Wednesday, July 16, 2014 Presentations