TThis talk presents a study of seismic risk to a complex transportation system, with the goal of quantifying impacts on users of the network and identifying communities that are disproportionally impacted by disruptions. The San Francisco Bay Area transportation system is considered as a case study. Disruption is caused by earthquake shaking, where a full suite of earthquake scenarios in the region (with associated occurrence rates) are considered in order to obtain a fully probabilistic description of risk.
This video discusses the basics of several approaches for numerical simulation of ground motion, presents three contexts for validation of simulations, and presents some results using "proxy" metrics to validate ground motion simulations. Transparent and informative validation is an important step in advancing the use of ground motion simulations in earthquake engineering.
This video describes a maximum likelihood fragility function fitting procedure that can be used with Multiple Stripe Analysis data. The Excel spreadsheet shown here, as well as other software and a related paper, can be found at this page
This video provides discussion of directionality in multicomponent ground motions, and provides a summary of directionality models developed for the NGA West 2 project.
This video provides a short overview of the group's work to characterize directivity effects as part of a project for the NGA West 2 project.
by Jack Baker, November 2010
This presentation provides an overview of the Conditional Mean Spectrum, and compares the resulting spectrum to the Uniform Hazard Spectrum as a target for ground motion selection. Similar content is provided in this journal publication. Note that the location of the PEER selection tool noted in this presentation has moved to http://peer.berkeley.edu/peer_ground_motion_database.
by Jack Baker, July 2011
An overview of the inputs to Probabilistic Seismic Hazard Analysis (PSHA), and the mathematics used to combine them and produce a seismic hazard curve. Similar content is provided in this report. Note that this video was recorded during a presentation to a class of students, so there are occasional discussions with students that are not fully audible on this video.
by Jack Baker, October 2011
In this presentation, presented as a keynote lecture at the Pacific Earthquake Engineering Research (PEER) Center's 2011 Annual Meeting, Jack Baker highlights a few of PEER's recent accomplishments and activities in the field's of seismic hazard and ground motion selection.
by Nirmal Jayaram, May 2010
In this presentation, recorded at the University of Southern California in spring 2010, Nirmal Jayaram presented an overview of his research on efficient techniques to assess risk to spatially distributed lifeline systems.
by Jack Baker, February 2009
In this presentation, recorded at the Menlo Park U.S. Geological Survey, Jack Baker presented techniques for emperically measuring spatial correlation of spectral acceleration values, and illustrated the relevance of the calculations for assessing risk to lifelines or portfolios of buildings.
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