The Indian Ocean Tsunami on December 26, 2004 caused the devastating disaster in the coastal areas along Indian Ocean. The many types of tsunami damage were observed in this event.
　・ The coastal low-lying areas were vastly flooded and eroded by the tsunami.
　・ The tsunami destroyed houses, buildings, coastal vegetation, and infrastructures like harbors,roadways and railways.
　・ A number offishing boats, large vessels and oil tanks were flushed away by tsunami action.
　・ A number of people including tourists were also killed. Lack of knowledge on tsunamis may delay evacuation which some of them should make.
　On the other hand, coastal and harbor structures like breakwaters, seawalls, embankments etc. and rigid coastal houses reduced the tsunami, resulting in reduction of tsunami damage.
　Comparing numerical results calculated by the numerical models which are the linear long wave model, linear dispersive wave model, and nonlinear long wave model in the spherical coordinate system or Cartesian coordinate system, and our developing numerical model named STOC, we can use our numerical model STOC for the Indian Ocean Tsunami.