Understanding the Origin of High-Frequency Ground Motions of Earthquakes in California and Nevada
Description:
Understanding the cause of damaging high-frequency earthquake ground motions is important from both a fundamental physics perspective and to better prepare for earthquake hazards. There are several competing theories over the origin of high-frequency ground motions. The standard paradigm is related to heterogeneity in slip on the rupture plane, but it remains challenging for these models to explain the variety of observed high-frequency ground motions with physically consistent parameters like stress drop and fault roughness. Alternatively, high-frequency earthquake radiation has recently been associated with fault complexity, though the underlying physical mechanisms are still not well understood. To untangle this problem, we measure response spectral accelerations at different periods for small and moderate earthquakes in California and Nevada and compare these measurements to predicted values from NGA-West2 ground motion models. We then use a mixed-effects decomposition method to decompose the residuals into event, site and path terms. We examine correlations between event terms at different periods and both source and fault zone characteristics, with the ultimate aim to better understand how high-frequency ground motions are generated in natural fault systems.
Session: High-frequency Ground Motion Measurements, Assessments and Predictions [Poster]
Type: Poster
Date: 4/18/2023
Presentation Time: 08:00 AM (local time)
Presenting Author: Avigyan Chatterjee
Student Presenter: Yes
Invited Presentation:
Authors
Avigyan Chatterjee Presenting Author Corresponding Author achatterjee@unr.edu Nevada Seismological Laboratory |
Daniel Trugman dtrugman@unr.edu Nevada Seismological Laboratory |
Jaeseok Lee jaeseok_lee@brown.edu Brown University |
Greg Hirth greg_hirth@brown.edu Brown University |
Victor Tsai victor_tsai@brown.edu Brown University |
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Understanding the Origin of High-Frequency Ground Motions of Earthquakes in California and Nevada
Category
High-frequency Ground Motion Measurements, Assessments and Predictions