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COSMOS Technical Sessions


2011 COSMOS Technical Session

Ground Motions from Subduction Earthquakes and Issues for Seismic Design

November 4, 2011
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 4th. This year's Technical Session was again co-sponsored by the Pacific Earthquake Engineering Center and the California Geological Survey. This Technical Session provided a background on currently available subduction ground motions from the 2010 Maule, Chile, and 2011 Tohoku, Japan, megathrust earthquakes. Appropriate V/H ratios and correlation terms (required for CMS) for large subduction earthquakes that arise in current practice were presented.

Schedule Title Authors
7:30 Registration and Continental Breakfast

8:30 Welcome and Overview of Day

B. Bachman
8:40 Overview of issues for Subduction Ground Motion and Time Histories

N. Abrahamson
Subduction Zone Ground Motions
9:00 2011 BC Hydro Subduction GMPE and Comparison with Data from Recent Subduction Zone Earthquakes

K. Addo
9:30 Regional Differences in Subduction Ground Motions—Event Terms and Large Distance Attenuation Relationships

C. Beauval
Subduction Zone Earthquake Motions Characteristics and Determination
10:15 Evaluation of Available Subduction GMPEs by GEM
C. di Alessandro
11:00 Correlationis of Epsilons for (CMS) fro Subduction Earthquakes and Comparisons with Crustal Earthquake Models

L. Al-Atik
11:20 V/H Ratios from Megathrust Earthquakes

N. Gregor
11:45 LUNCH

12:15 COSMOS Annual Business Meeting

W. Iwan
1:05 BREAK

Christchurch and Virgina Earthquakes
1:15 Ground Motions from February 2011 Earthquakes

N. Abrahamson
1:40 Ground Motions from the 2011 Virginia Earthquakes

N. Abrahamson
Selection and Scaling Megathrust Time Histories
2:00 Issues for Selection and Modifying Megathrust Time Histories

N. Abrahamson
2:45 BREAK
Geotecnical Issues Associated with Strong Earthquakes
3:00 The Effects of Long-Duration Motions on Liquefaction and Slope Stability

S. Kramer
3:30 Soil Liquefaction in the Christchurch Area during Recent Earthquakes

J. Bray
Panel Discussion: Influence of these Recent significant Earthquakes on Ground Motion Determination and Geotechnical/foundation Evaluations
4:05 Panel Discussion

5:00 Adjourn for Cocktail Hour (No Host)

5:00 pm Adjourn for Cocktail Hour (No Host)

Past Technical Sessions

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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