Research Videos

Seismic risk to transportation networks

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.

Ground motion simulation validation

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.

Fragility function fitting

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

Characterizing directionality in earthquake ground motions

Directionality in multicomponent ground motions, and a summary of directionality models developed for the NGA West 2 project.

An introduction to the Conditional Mean Spectrum

An   introduction to the Conditional Mean Spectrum, and comparison the resulting spectrum to the Uniform Hazard Spectrum as a target for ground motion selection. Similar content is provided in this publication.

An introduction to Probabilistic Seismic Hazard Analysis

A 2011 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.

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