1 2,085 d Volcanic warning for Nishino Shima at 27-14.6N 140-52.7E, eruption influence expected within 0.9 mile, canceling warnings 0037 and 0316/20. Philippine Sea
event NAVAREA XI 488/20
2020-12-18
2 1,878 d Discoloured water is sighted near Nanpo Shoto at 24-48.8N 141-19.2E, July 13, 08:00 UTC. Vessels advised caution. North Pacific, Nanpo Shoto · Philippine Sea
event NAVAREA XI 231/21
2021-07-13
3 1,787 d Discoloured water observed within about 0.7 miles of 27-13.6N 140-55.3E in North Pacific, Nanpo Shoto, at 120643Z Oct. North Pacific, Nanpo Shoto · Philippine Sea
event NAVAREA XI 325/21
2021-10-12
4 1,786 d Discoloured water observed extending south for 5 miles, 2 miles wide, from 27-16.7N 140-56.6E at 120643Z October. North Pacific, Nanpo Shoto · Philippine Sea
event NAVAREA XI 326/21
2021-10-13
5 1,177 d Discoloured water and submarine volcanic eruption continue near 24-17.2N 141-28.8E, North Pacific, Nanpo Shoto, at 140350Z June. Caution advised. North Pacific, Nanpo Shoto · Philippine Sea
event NAVAREA XI 207/23
2023-06-14
6 1,177 d On June 14, discoloured water was observed near 25-27.1N 141-14.5E in Nanpo Shoto; vessels advised caution. North Pacific, Nanpo Shoto · Philippine Sea
event NAVAREA XI 206/23
2023-06-14
7 714 d Discoloured water observed near Nanpo Shoto at 31-26.4N 140-03.0E on September 18, 2024 at 0545Z. Vessels advised caution. North Pacific, Nanpo Shoto · Philippine Sea
event NAVAREA XI 491/24
2024-09-19
8 714 d As of September 19, a volcanic warning for Sumisu Shima at 31-26.3N 140-03.0E expects eruption influence around the volcano. North Pacific, Nanpo Shoto · Philippine Sea
event NAVAREA XI 492/24
2024-09-19
9 366 d A volcanic eruption continues at Io To in the Nanpo Shoto, North Pacific. Vessels are advised to be cautious. Cancellation of warning 0539/24. North Pacific, Nanpo Shoto · Io To
NAVAREA XI 412/25
2025-09-02
10 366 d Volcanic activity is reported at Io-To in vicinity of 24-45.00N 141-17.3E. North Pacific · Philippine Sea · Japan · Philippine Sea
event HYDROPAC 2242/25
2025-09-02
11 49 d Discoloured water reported near 20-26.0N 145-01.0E on 16 July at 0013Z; cancels warning 0020/24. North Pacific, Marianas · North Pacific Ocean
event NAVAREA XI 322/26
2026-07-16
12 49 d Discolored water with increased likelihood of submarine volcanic activity is reported in Northern Mariana Islands vicinity at 20-26N 145-01E on July 16 at 0013Z. North Pacific · Northern Mariana Islands · North Pacific Ocean
event HYDROPAC 2039/26
2026-07-16