Estimates of kappa and effects on ground motions in the San Francisco Bay area
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Tara Nye
Univ. of Oregon / Earthquake Science Center
- Date & Time
- Location
- Microsoft Teams
- Host
- Annemarie Baltay
- Summary
Ground-motion studies are a key component of seismic hazard analyses and often rely on information of the source, path, and site. Site-specific studies are of particular interest to seismic hazard studies, especially in the field of earthquake engineering, as near-site conditions strongly influence ground-motion at a particular site. Kappa is an observational parameter that models the decay of high frequencies of an acceleration spectrum, and its site contribution (k0) has shown to be a good predictor of high-frequency ground motions (such as PGA). However, estimates are often limited as they require high seismicity and available instrumentation. We have developed a k0 dataset for the San Francisco Bay area and produced a continuous regional map of k0. In this presentation, I will present the results of this study and an analysis of how k0 correlates with various geologic conditions in the Bay Area. Incorporating the estimates of k0 from this study can add predictive power to ground-motion models, thus increasing the accuracy of predicted ground motion and improving the robustness of ground-motion studies in the San Francisco Bay area.