School of Marine Technology Tokyo University of Marine Science and Technology Tokyo 135-8533 Japan;
Japan Agency of Maritime Education and Training for Seafarers Yokohama 231-0003 Japan;
School of Marine Technology Tokyo University of Marine Science and Technology Tokyo 135-8533 Japan;
School of Marine Technology Tokyo University of Marine Science and Technology Tokyo 135-8533 Japan;
Root-cause analysis; 4M4E analysis; 4M4E+P analysis; mooring line accident; trigger factor;