4:45 PM - 5:00 PM
*Masashi NAGAI1, Tetsuji Ichino2, Hiroki Minami2, Yasuhiro Takanashi2, Kenichiro Tani3 (1. Volcano Research Department, National Research Institute for Earth Science and Disaster Resilience, 2.Hydrographic and Oceanographic Department, Japan Coast Guard, 3.National Museum of Nature and Science)