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Solid Earth Seminars by Elizabeth Madden.

Abstract: The case of the 2018 Palu Bay tsunami was as surprising to scientists as it was devastating to local communities on the island of Sulawesi, Indonesia. Despite the clear left-lateral strike-slip signature of the earthquake, a type of event that does not typically source a tsunami, it was rapidly followed by destructive waves. So, what happened? How was the water pushed up or pulled down to create this tsunami: by submarine landsliding or faulting or both? I will present our conclusions from physics-based coupled earthquake-tsunami models that show that strike-slip faulting can directly cause a tsunami, when there is a component of dip-slip on the fault. The article is available at: https://doi.org/10.1007/s00024-019-02290-5. This work is an application of the modeling framework developed in the context of the Advanced Simulation of Coupled Earthquake and Tsunami Events (ASCETE) project. This framework links subduction zone processes across space and time by coupling a geodynamic seismic cycling model, a dynamic earthquake rupture model, and a tsunami model. You can preview these methods on EarthArXiv at 10.31223/osf.io/rzvn2.