COSMOS Technical Session on Nov 4th: Ground Motions from Subduction Earthquakes and Issues for Seismic Design

The Consortium of Organization for Strong Motion Observation Systems (COSMOS) will be holding its Annual Meeting and Technical Session at the Hilton Garden Inn in Emeryville, California on Friday, November 4th.  The Hilton Garden Inn is conveniently located at 1800 Powell Street one block west of the I-80 Freeway. This year’s Technical Session is again being co-sponsored by the Pacific Earthquake Engineering Center (PEER) and the California Geological Survey (CGS). Registration for the Technical Session will begin at 7:30 am (with coffee and pastries). The Technical Session will begin promptly at 8:30 am and with a lunch break at noon. The COSMOS Annual meeting will start at 12:15 pm and adjourn by 1:05 pm. The Technical Session will then reconvene and end at 5:00 pm. As in previous years, it will then be followed by a no-host cocktail hour.  
The title of the 2011 Technical Session is: “Ground Motions from Subduction Earthquakes and Issues for Seismic Design”.  Currently available subduction ground motion prediction equations (GMPEs) will be discussed and compared to the 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 will be presented.  Presentations will be made by Kofi Addo, Celine Beasuval, Carola Di Alessandro, Linda Al-Atik, Nick Gregor and Norm Abrahamson. There will also be a presentation by Steve Kramer on how long duration megathrust earthquakes influence geotechnical effects including liquefaction and slope stability.  As in years past, the last of the technical session will include a lively panel session.
In addition to subduction earthquakes, the ground motions from the Feb 2011 Christchurch and Aug 2011 Virgina earthquakes will be presented and the potential influences of these earthquakes on Ground Motion Prediction Equations used in the US will be discussed. Also the widespread soil liquefaction that occurred during recent earthquakes in the Christchurch earthquake will be discussed by Jonathan Bray. These smaller magnitude earthquakes are expected to have a major influence on strong ground motion determinations and design.  This Technical Session will provide presentations on ground motions measured in these earthquakes and in their influence on attenuation relationships.
Registration fees are $160 for COSMOS and PEER members and $200 for nonmembers that includes both lunch and refreshments.  There is also a special reduced student rate of $40.  Complete program and registration details for the COSMOS Annual Meeting and Technical Session should be available by the end of August at the COSMOS website at: