Variability in Earthquake Rupture Processes and Implications for Ground Motions: Insights from Recent Earthquakes in California and Nevada
Daniel Trugman
University of Nevada, Reno
- Date & Time
- Location
- Online-only seminar via Microsoft Teams
- Host
- Evan Hirakawa
- Summary
The level of ground motion felt during an earthquake is controlled primarily by the size of the event and the distance from the source. However, it has long been understood that variations in rupture properties like stress drop and rupture directivity can cause earthquakes of equal size to generate significant differences in ground motion. This seminar will focus in detail on the relation between the rupture process and ground motions through case studies of M5-M6 earthquakes in California and Nevada. In California, we use a Bayesian spectral inference technique to reveal regional variations in stress drop and directivity among recent M5 earthquakes. We then focus in detail on a large normal faulting earthquake near the California-Nevada border, where precariously balanced rocks provide a unique perspective on near-fault ground motions. Taken together, these studies provide new insights into rupture and ground motion that inform both fundamental earthquake science and more applied hazard calculations.
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