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- S31C-0215: The Effects of Bulk Friction and Cohesion in 2D Dynamic Models of the 1971 San Fernando Earthquake
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Board 0215‚ Hall EFG (Poster Hall)NOLA CC
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Guadalupe Bravo, University of California Riverside (First Author, Presenting Author)
David Oglesby, University of California, Riverside
Élyse Gaudreau, University of Victoria
Gareth Funning, University of California Riverside
Edwin Nissen, University of Victoria
James Hollingsworth, Université Grenoble Alpes
During an earthquake, rocks slip past each other to release built-up strain. Part of this displacement occurs along main, high-strain slip surfaces (on-fault slip) while some is accommodated in the material surrounding those surfaces (off-fault deformation). The 1971 San Fernando earthquake occurred in a densely populated area in southern California, rupturing the Sylmar and Tujunga fault segments. Measurements by Gaudreau et al. (2023) showed that the Sylmar segment experienced more vertical off-fault deformation than the Tujunga segment. Our goal is to explain this pattern using numerical models and explore factors such as the difference in dip angle and material properties, as well as material plasticity. This has led us to explore how parameters of plasticity, such as bulk friction and cohesion, affect slip. We have observed that as we decrease bulk friction and cohesion, slip for our models also decreases, while off-fault deformation increases. In addition, while we have qualitatively observed more off-fault deformation in our models for the Sylmar segment than in our models for the Tujunga segment, we have had to fine-tune our models as we try to quantitatively reproduce the observed pattern, which could highlight a limitation of 2D models or other aspects of our formulation.
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