Numerical modeling of the September 5, 2004 Tokaido-Oki Earthquake Tsunami

On September 5, 2004, a series of earthquakes occurred off the coast of Kii peninsula, Japan. Tsunamis accompanied with the foreshock of JMA magnitude 6.9 occurred at 19:07, September 5, JST, and the mainshock of JMA magnitude 7.4 occurred at 23:57, September 5, JST. These tsunamis were observed at several tidal gauge stations along the Pacific coast in Japan, for instance, 86cm at Kushimoto, 81cm at Kozushima, and 61cm at Owase by the mainshock . We performed a numerical modeling of tsunami with non-linear shallow water equations. Based on the model results and observed tsunami records, we discuss the generation mechanisms and the characteristics of tsunami propagation along the Pacific coast.