Seismic Analysis of the Reef-seawater System: Comparison between 3D and 2D Models

This study established a 3D seismic analysis model for the reef-seawater system, in which the fluid-solid interaction algorithm, the fluid and solid artificial boundaries are adopted for numerical modelling, and the boundary substructure method is used for seismic wave input. On that basis, we conduct a comparative seismic analysis between 2D and 3D models. The results show that the ground motion distributions in the middle reef regions calculated by 2D and 3D models are generally consistent with each other. However, in the areas where the topography changes drastically, the 3D terrain shows an important influence on the local seismic response.