Abstract
This paper describes ship action at 2011 TOHOKU earthquake. About fifty-seven percent ships of tsunami damaged area evacuated at the time of tsunami, and about seventeen percent ships waited in port. And about twenty-six percent ships drifted by tsunami flow. And about forty percent ships damaged by tsunami. This paper also describes the results of investigation about ship action at the time of tsunami. According to the investigation, the relationship of tsunami height between ship damage is arranged concerning each harbor, when coefficient of correlation is taken with tsunami height and ship damage ratio inside the port it was about 0. 83.And it seems that the effective countermeasures about tsunami are, for example, information tool preparedness, and the teaching item for foreign seamen preparedness, and so on.
