See below for selected videos summarizing research from our group. Many additional videos are available on our YouTube Channel.
This video (the 2023 William B. Joyner Lecture) provides an overview of efforts to quantify spatial correlations in amplitudes, via observations from past earthquakes and numerical simulations. Regional risk analysis results demonstrate the potential role of spatial correlations on impacts to the built environment. Traditional techniques for fitting empirical correlation models are discussed, followed by a proposal for new methods to account for soil conditions and other site-specific effects. Prospects for future opportunities in this field are also addressed, including the role of numerical simulations and advanced risk assessment.
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.
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.
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
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, and comparison the resulting spectrum to the Uniform Hazard Spectrum as a target for ground motion selection. Similar content is provided in this publication.
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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