**2.1. Numerical model**

Numerical computations have been performed that represent tsunami generation due to a body, which moves down a slope. In the present calculation, the numerical model, developed by Iribe and Nakaza [24], based on the MPS method designed by Koshizuka and Oka [29], is applied to consider the furious water motion. The water surface level is determined using the spatial gradient of particle‐number density, to inhibit pressure disturbance at the water surface. No turbulence model is utilized for fluid motion, and both the elasticity, and the plasticity, of the falling bodies are neglected for simplicity.
