SSHAC Workshop 3B – March 4-5, 2015


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Next Generation Attenuation for Central and Eastern North America (NGA-East)

SSHAC Workshop 3B – Proponent Discussions and Feedback Analyses
March 4-5, 2015


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

Presentations usually involve numerous researchers and contributors. Only the name of the presenter is listed below.

March 4, 2015 Wednesday

08:00-08:05 Opening remarks (Y. Bozorgnia)
08:05-08:30 Introduction, status of project, expected outcomes from Workshop 3B (C. Goulet)
08:30-10:00 Median ground motions: overview of GMMs/GMPEs considered and discussion of model evaluation (R. Graves)
10:00-10:15 Break
10:15-11:45 Median ground motions: methodology for using high-dimension visualization of ground motion space (G. Atkinson)
11:45-12:15 Median ground motions: populating the ground motion space for NGA-East & sensitivity analyses (N. Kuehn)
12:15-13:15 Lunch
13:15-14:15 Median ground motions: epistemic uncertainty and integration, re-discretizing the ground motion space for NGA-East (N. Kuehn)
14:15-14:30 Break
14:30-14:40 Preview of weight assignment approaches (N. Kuehn)
14:40-15:05 Discussions
15:05-15:20 Summary of the day (TI team)
15:20-15:30 Observers comments
15:30-16:00 PPRP, PM, JMC, TI team debriefing (closed doors meeting)

March 5, 2015 Thursday

08:30-08:35 Introduction (C. Goulet)
08:35-09:35 Median ground motions: assigning weights to median models for NGA-East (N. Kuehn)
09:35-10:30 Standard deviation of ground motions: available and new models (L. Al Atik)
10:30-10:45 Break
10:45-11:15 Standard deviation of ground motions: evaluation and integration (L. Al Atik, continued from above)
11:15-12:00 Discussion
12:00-13:00 Lunch
13:00-14:15 Hazard feedback analyses: 1) sites and source characteristics, 2) results (R. Youngs)
14:15-14:50 Proposed logic trees and approach to finalize the model (TI Team)
14:50-15:15 Discussions
15:15-15:30 Summary of the day (TI team)
15:30-15:40 Observers comments
15:40-15:45 Closing remarks (Y. Bozorgnia)
15:45-16:00 Closing
16:00-16:15 Private PPRP meeting
16:15-16:45 PPRP, PM, JMC, TI Team debriefing (closed doors meeting)




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