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COSMOS Technical Sessions


2012 COSMOS Technical Session

Issues Associated with Adjusting SGA-based GMPEs for Directivity and Fling, and Short-term Impacts of Serious Aftershocks on Building Code Ground Motions

November 16, 2012
8:30 AM—6:00 PM
Hilton Garden Inn
Emeryville, California

The Consortium of Organizations for Strong-Motion Observation Systems (COSMOS) held its Annual Meeting and Technical Session at the Hilton Garden Inn located in Emeryville, California, on Friday, November 16th. This year's Technical Session was again co-sponsored by the Pacific Earthquake Engineering Center and the California Geological Survey. This Technical Session focused on two subjects: (1) the issues associated with adjusting the recently developed NGA ground motion prediction equations for directivity and fling when developing near-fault design ground motions; and (2) issues associated with developing building code design ground motions when serious aftershocks will likely be greater than current building code ground motions.

Schedule Title
7:30 Registration and Continental Breakfast
8:30 Welcome and Overview of Day
B. Bachman
8:40 Brief Review of Past COSMOS Technical Sessions
N. Abrahamson
Probabilistic Design Ground Motions and Serious Aftershocks
9:00 Risk-based Design Ground Motions—Use in Current Seismic Codes
C. Kircher
9:45 Effect of Aftershocks on Probabilistic Design Ground Motions
N. Luco
OperationaL Earthquake Forecasting
N. Field
10:25 Break
Christchurch/Brawley/COSMOS VDC Update/15WCEE COSMOS Strong-Motion Forum
10:45 Design Earthquake Ground Motion Criteria—Lessons Learned from Christchurch
W. Holmes
11:00 The 2012 Brawley Earthquake Swarm—Preliminary Analysis of Data from Wildlife Liquefaction Array
C.B. Crouse
11:20 Summary of the COSMOS Strong-Motion Forum at the 15WCEE
C. Stephens
11:30 Update on the COSMOS Virtual Data Center
H. Haddadi
11:40 VDC Strong-Motion Toods Development and Discussion
.C.B. Crouse
11:50 Autonomous Low-power Acceleratograph—To Obtain Strong Motion Recordings near Large Earthquakes
A. Shakal
12:00 COSMOS Annual Business Meeting
W. Iwan
1:05 BREAK
Near-fault Directivity and Fling Effects
1:15 Overview of Current Practice for Directivity and Fling, and Issues
N. Abrahamson
1:35 Summary of Directivity Effects in NGA—West2 GMPEs
J. Watson Lamprey
1:55 Are Directivity Effects Captured in the Standard Deviation for NGA Models?
J. Watson Lamprey
2:15 Discussion: How Should Deterministic Ground Motions Be Computed with Directivity
N. Abramhamson
2:40 Break
Discussion on Incorporation of Directivity for Design Ground Motions
3:00 Are Flings Effects Caputer in the NGS Models?
R. Kamai
3:30 Discussion: Incorporation of Fling for Design Ground Motions
N. Abrahamson
4:05 Panel Discussion
5:00 Adjourn for Cocktail Hour (No Host)

Past Technical Sessions

Ground Motions from Subduction Earthquakes and Issues for Seismic Design
Issues Associated with Applying Conditional Mean Spectra to the Selection and Scaling of Design Ground Motions
Practical Application of the New ASCE 7-10 Required Procedures for Determining Site Specific Ground Motions
Selection and Scaling of Ground Motions for Site Response Analysis and Geotechnical Evaluations
Recommendations for Selection and Scaling of Ground Motions for Building Code and Current Performance-Based Earthquake Engineering (PBEE) - Applications and an Evaluation of Selection and Scaling Procedures Proposed for the Next Generation of PBEE
An Evaluation of Methods for the Selection and Modification of Ground Motion Time Histories for Building Code and Performance based Earthquake Engineering Applications
Recommendations for the Selection and Scaling of Ground Motion Time Histories for Building Code Applications

COSMOS is a non-profit organization whose goal is to expand and significantly modernize the acquisition and application of strong-motion data in order to increase public safety from earthquakes.

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