Workshops/Meetings

Sigma Working Group

May 22, 2013 Conference call

Linda’s presentation

January 26, 2011 Meeting (PEER – Davis Hall)

Jan 26 Meeting Agenda (PDF file – 12KB)
Sigma Working Group Progress Meeting_Jan26_2011 (PDF file – 2.4MB), by Linda Al Atik
PEGASOS sigmamodel-23012011 (PDF file – 755 KB), by Adrian Rodriguez-Marek

October 20, 2010 Meeting (PEER – Davis Hall)

Sigma Working Group Progress Meeting (PDF file – 32 KB)
Estimates of Single Station Sigma Using World-Wide Data (PDF file – 3.8 MB)
Sigma Path (PDF file – 2.9 MB)
Preliminary single-station sigma results for Wenchuan aftershocksresults for Wenchuan aftershocks (PDF file – 2.6 MB)

August 5, 2010 Meeting (PEER – Davis Hall)

Next Generation Attenuation for CEUS ( 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

Bozorgnia_NGA_East_Sigma_Workshop_Feb_10_2010.pdf – 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 CEUS

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

September 30, 2009

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