In the near future, tsunamis caused by the Tokai, Tonankai and Nankai Earthquakes are anticipated to arrive at wide areas of the Pacific coast of Japan. Although many important infrastructures are located in the port areas, any countermeasures against the tsunamis have not been undertaken for moored ships in the ports. Therefore, the authors estimated the tsunami impacts to various-type moored ships and mooring facilities in the Port of Shimizu by using the tsunami and ship motion simulations for the scenario Tokai Earthquake Tsunami in this study.
　The results derived in this study are summarized as follows:
1)When the Tokai Earthquake Tsunami arrives in the Port of Shimizu, the tsunami flow becomes parallel to the quay lines and strongly induces the surging of the moored ships at the target four berths.
2)The motion of a large size ship generally becomes larger because its natural period for surging is close to the dominant period of the tsunami. Therefore, the large ship moored at the quay gives strong impacts on the mooring facilities.
3)When the ship is moored in the ordinary method, the tsunami-induced tensions of the shorter mooring ropes such as the breast and spring lines tend to be larger than those of the longer mooring ropes such as the head and stern lines.
4)When each mooring rope is two to four times longer than that in the ordinary method, the horizontal motions of the moored ship are large, but the tensions of each mooring rope become uniform.
5)The mooring method using long ropes in all positions is considered to be the most effective way against the tsunami.