It is essential to maintain the infrastructure after the earthquake. Ships are considered as effective media for transferring people and relief goods to the area where it is very difficult to reach by overland route. For this reason, protecting ships from the Tsunami is very important for saving human life as well as restoration work. In order to achieve this, it is necessary to know the marine traffic condition and find out the area in collision danger when the earthquake is occurred. However, there are few marine traffic studies for this purpose.
In this study, estimating collision course area using OZT (Obstacle Zone by Target) in offshore refugee outside the port is proposed and evaluated its efficiency for reducing collision risks in evacuation from the Tsunami.
