The 2011 Tohoku earthquake and tsunami at 14:46 JST on March 11, 2011 affected large areas of the eastern and northern part of Japan, and many sea disasters against vessels moored along terminal inside harbor occurred. We conducted surveys upon the sea disasters of several large vessels such as crude oil carriers and coal carrier. There was also a severe disaster of two large coal carriers at S-Port, which were moored at neighboring berths and encountered a tsunami wave height beyond 9 meters. The bathymetry around the berths was considerably variable particularly. In this paper, we have conducted a survey upon the ships' behavior in time series by hearings and comparisons with the tsunami simulation results, and investigated calculation method of tsunami wave forces.
