Abstract
Many sea disasters of vessels moored along the terminals occurred during the 2011 Tohoku Earthquake Tsunami. We conducted surveys of the sea disasters for two large crude oil carriers moored at dolphin terminals. The mooring lines breakages happened not only in the tsunami attack but also in the seismic vibrations. In this study, we have composed a time domain model to estimate the moored ship behavior due to oscillations of dolphins during earthquake, and investigated the Aframax tanker behavior moored at dolphins during the seismic vibration which was actually recorded at the harbor. It is clarified that there is a possibility to push out the tanker and induce the mooring line breakage due to oscillations of dolphins during earthquake.
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