SSHAC Workshop 2 – July 14-16, 2014


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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

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