Numerical Study on Propagation Characteristics of Tsunami Induced by Tokai,Tonankai and Nankai Massive Earthquakes

摘要

After the 2011 Tohoku Earthquake,it has been pointed out that Tokai,Tonankai and Nankai massive earthquakes with a magnitude of 9.0 could strike the Pacific coasts in western Japan.This study aims at investigating numerically propagation characteristics of tsunami generated by a 9.0 magnitude Tokai,Tonankai and Nankai massive earthquakes on the Pacific coasts and three major bays in Japan,Tokyo Bay,Ise Bay and Osaka Bay.It was revealed from the numerical results that the tsunami heights on the Pacific coasts for M9.0 earthquake were about twice as much as those for M8.7 earthquake and the first tsunami arrival time was faster at some areas distant from the tsunami source.Moreover,high water level in the bays was recognized to continue for a long time because of the enclosed bays.