Hydraulic model experiment and numerical simulation for tsunami assuming the caldera collapse

Volcanic tsunamis occur at less frequency than seismic tsunamis, and its actual occurrence mechanism is not so clear. However case studies of numerical analysis on past volcanic tsunamis have been conducted, the occurrence process is diverse and there are many unexplained issues. In this study, we focus on tsunamis due to caldera collapse at volcanic activity, and carried out hydraulic model experiment to clarify its occurrence mechanism and obtain verification data for numerical analysis method. As a result, we have confirmed the occurrence mechanism of tsunami due to caldera collapse by hydraulic model experiment. And it is possible to express the occurrence of tsunami due to caldera collapse observed in hydraulic model experiment by numerical analysis method developed in the past. (author)