重建龜山島北側崩塌與海底山崩所引致之古海嘯(II)

This project is the second year of the three-year plan. Through the investigation of the distribution of the seabed sediments of Kueishantao Island and the rheological behavior of debris measured in the first year of the plan, this year will use the newly developed discontinuous Bi-Viscous model (DBM) to simulate the behavior of MTD2 debris avalanches induced landslides and tsunamis. And take the distribution of MTD2 as the basis for verification of the simulation results.The eruptions of the volcanic island are often accompanied by the collapse of the volcano's flank. For example, there are evident traces of collapse on the side of Kueishantao Island facing the Lanyang Plain. Through the seabed survey, Prof. Shu-Kun Hsu's team found that the seabed sediments of Kueishantao Island collapsed were mainly composed of three massive lithic landslides (MTD1, MTD2, MTD3). Among them, the volcanic eruption on the north side of Kueishantao Island was the main contribution of MTD2, while MTD3 was caused by the cutting of the terrain by subsequent ocean currents and the volcanic eruption 7000 years ago, which led to submarine landslides. Kueishantao Island is an active volcano. There is a possibility that it will erupt again in the future. There may be a tsunami if the eruption collapses the existing island. Since its collapse is facing the Lanyang Plain, the potential tsunami threat on the coastal area of Yilan cannot be ignored.