Abstract
In some isolated islands far from the Japanese main island, port facilities like a quay, sea wall and breakwater have not been completed. A mooring buoy is widely employed to moor a vessel at the quay walls facing to the ocean. The joints of the buoy-mooring chain may be broken off when large impulsive tensions are exerted by attacks of large waves. The impulsive mooring tension can be reduced by applying an elastic'rubber chain'as a part of the buoy mooring chain. The tension may become less in case of soft ground.
