“Sigma” Workshop
February 10, 2010; 9:30AM – 4:30PM
310 CITRIS Building (Sutardja Dai Hall), UC Berkeley
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).
As part of this research program, PEER will coordinate a large number of public workshops over the life of the project. The purposes of such workshops are to collect feedback from the earthquake community and inform the participants about the on-going technical activities.
The first of such public workshops is the “Sigma Workshop”, which will focus on issues related to the uncertainty in the ground motion prediction equations (GMPEs) for the central & eastern North-America (CENA). The goals of the workshop are to:
- Identify the key technical issues to be resolved related to aleatory and epistemic uncertainties of GMPEs for CENA,
- Provide a tentative plan to address the technical issues identified, and
- Collect feedback from the workshop’s participants on the technical issues and tentative plan.
How can I attend this seminar?
- Attend in person at Auditorium in Room 310, Sutardja Dai Hall (CITRIS), UC Berkeley. Attending the workshop is free of charge; however, registration is required. Please register below before February 1, 2010.
- Watch remotely via Webcast live at 9 am February 10 2010: mms://media.citris.berkeley.edu/PEER. The webcast will become available at 8:45 am. It should load automatically, but if you have problems, make sure your computer has the latest version of Windows Media Player, RealPlayer or QuickTime installed. If you have questions during the webcast, email them to Yousef Bozorgnia (yousef@berkeley.edu) and he will announce them during the Q&A period following each presentation.
We hope you can attend and look forward to your input. The detailed agenda of the workshop will be distributed in the following weeks.
Next Generation Attenuation for CENA ( NGA-East) “Sigma” Workshop
February 10, 2010
Attend in person at Auditorium in Room 310, Sutardja Dai Hall (CITRIS), UC Berkeley.
Agenda (PDF file – 2.1 MB)
Presentation Files
- Next Generation Attenuation for Central & Eastern North-America (NGA-East): An Overview of the Project – Yousef Bozorgnia (PDF file – 1.17 MB)
- NRC Perspective on the NGA-East Project – Annie Kammerer (PDF file – 643 KB)
- 2009-04 CEUS Seismic Source Characterization Project – Larry Salomone (PDF file – 7.6 MB)
- SIGMA: What it is, why it ma-ers and what we can do with it – Julian J. Bommer (PDF file – 7.6 MB)
- Sigma Components: Notation & Initial Action Items – Norm Abrahamson (PDF file – 332 KB)
- CEUS Ground-Motion Uncertainty and Its Effect on Probabilistic Seismic Hazard Analysis – Gabriel R. Toro (PDF file – 996 KB)
- Comparison of Sigma for Active Regions and SCRs: EPRI (2006) Approach – Norm Abrahamson (PDF file – 2.54 MB)
- Aleatory Variability: A Preliminary Analysis of PGA in California – Brian Chiou (PDF file – 1.26 MB)
- Stress Parameter Variability – Walter Silva and Robert Darragh (PDF file – 395 KB)
- Observations on the Magnitude Dependence of the Standard Deviation of Ground Motion Models for Small to Moderate Magnitude Data – Linda Al Atik (PDF file – 1.82 MB)
- Quantification of epistemic uncertainty on Ground Motion Models – Frank Scherbaum (PDF file – 21.54 MB)
Videos of the workshop
Introduction, Sigma Public workshop Feb, 2010
Overview of NGA-East Program
Funding Agencies’ Perspective
Funding Agencies’ Perspective, speaker Larry Salomone
Sigma: What it is, Why it Matters and What Can We Do With It
Sigma in NGA-East: Framework, Terminology & Tentative List of Action Items
Sensitivity of Hazard to Sigma; and Hisorical Evolution of Sigma in CENA
Comparison of sigma for active regions and SCRs: EPRI 2006 Approach
Magnitude Dependence of Sigma: Preliminary Analysis of Small Magnitude Data
Sigma: Point Source Stress Drop Variablility – Example Estimation of Inter-Event Parametric Term
Quantification of Epistemic Uncertainty on Ground Motion Models
Constrainsts on Sigma from Physical Evidence
Sigma Closing Discussions
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