- S13C-0201: 3D Physics-Based Ground Motion Simulation and Near-Surface Structure Effects of the 2024 Feidong M4.7 Earthquake
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Board 0201‚ Hall EFG (Poster Hall)NOLA CC
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Guili Zhou, University of Science and Technology of China (First Author, Presenting Author)
Huajian Yao, University of Science and Technology of China
The Feidong area, located in the southern part of the Tanlu fault zone, is a region where several tectonic plates meet. In recent years, small to moderate earthquakes have occurred more frequently here. Although these earthquakes weren't very large, the surrounding basin amplified the ground shaking significantly. On September 18, a magnitude 4.7 earthquake occurred, followed by a magnitude 3.8 earthquake on September 25 and a magnitude 3.3 earthquake on October 1. These aftershocks were recorded by a dense network. We conducted numerical simulations to model the ground motion for the two smaller earthquakes. We used three different velocity models in simulations: a low-resolution model from previous research; a higher-resolution model based on ambient noise tomography, with deeper layers supplemented by the first model; and an even more detailed model incorporating 100-meter-resolution VS30 data, which accounts for variations in site condition. The results show that the third model, best captures the amplification and prolongation of ground motion in basin areas. The simulated peak ground velocity shows agreement with observations, with high values resulting from both basin effects and source mechanism. This means that for better earthquake hazard assessment, we need to account for both detailed underground structures and source characteristics.
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