SSHAC Workshop 3C – June 17-18, 2015


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

SSHAC Workshop 3C – Proponent Discussions and Feedback Analyses
June 17-18, 2015

The focus of this 1.5 day workshop was on the TI Team Ground Motion Characterization model. Handouts available for download:

PDFs of all presentations

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

June 17, 2015 Wednesday

09:00-09:05 Opening remarks (Y. Bozorgnia)
09:05-09:20 Introduction and project status (C. Goulet)
09:20-09:30 Median ground motions: methodology flowchart (C. Goulet)
09:30-10:00 Median ground motions: overview of GMM evaluation (R. Graves)
10:00-10:30 Median ground motions: distance extrapolation of GMMs (R. Youngs)
10:30-11:00 Median ground motions: continuous distributions of GMMs (N. Kuehn)
11:00-11:15 Break
11:00-12:00 Median ground motions: visualization of the ground-motion space and re-discretization (N. Kuehn)
12:00-12:30 Discussions
12:30-13:30 Lunch
13:30-14:15 Median ground motions: assigning weights (N. Kuehn)
14:15-14:45 Discussions
14:45-15:00 Break
15:00-16:15 Standard deviations of ground motions: models and weights (L. Al Atik)
16:15-16:45 Discussions
16:45-17:00 Summary of the day (TI team)
17:00-17:15 Observers comments

June 18, 2015 Thursday

08:30-08:35 Introduction (C. Goulet)
08:35-09:55 Adjustment models: Gulf Coast region (C. Goulet)
09:05-09:30 Adjustment models: source-depth effects (D. Boore)
09:30-10:00 Adjustment models: source-depth effects Model Centering (C. Goulet)
10:00-10:20 Adjustment models: hanging-wall effects (R. Youngs)
10:20-10:45 Break
10:45-11:30 Hazard feedback analyses: results for NGA-East (R. Youngs)
11:30-11:50 Ground Motion Characterization model: a summary (C. Goulet)
11:50-11:55 Summary of the day (TI Team)
11:55-12:00 Observers comments
12:00-12:05 Closing remarks (Y. Bozorgnia)

Project information

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.


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