Volcanic activity in the North Pacific Ocean

Submarine eruptions, discoloured water, pumice rafts.

in force
2
last 12 months
2
vs previous 12 (0)
—
since 1999
13

Coverage note: the NGA archive ends 2024-05 and live collection began 2026-08-17. Warnings issued in between are here only if they were still in force when collection started, so 2024–2026 are under-counted.

In force now · 2

  1. HYDROPAC 2039/26in force2026-07-16
    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
  2. NAVAREA XI 322/26in force2026-07-16
    Discoloured water reported near 20-26.0N 145-01.0E on 16 July at 0013Z; cancels warning 0020/24.
    North Pacific, Marianas

Longest in force

  1. NAVAREA XI 322/26in force2026-07-16 · 36 d
    Discoloured water reported near 20-26.0N 145-01.0E on 16 July at 0013Z; cancels warning 0020/24.
    North Pacific, Marianas
  2. HYDROPAC 2039/26in force2026-07-16 · 36 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

By year

99
03
05
06
08
09
14
23
24
26

By month (all years)

J
F
M
A
M
J
J
A
S
O
N
D

Other hazards in the North Pacific Ocean

Archive · 11 cancelled

  1. HYDROPAC 153/242024-01-13 → 2026-08-14
    Discolored water with increased likelihood of submarine volcanic activity reported near Northern Mariana Islands at 20-25N 145-01E on January 13.
    Western North Pacific · Northern Mariana Islands
  2. HYDROPAC 12/242024-01-01 → 2026-08-14
    Submarine volcanic activity causing discolored water reported in Northern Mariana Islands at 20-25.2N 145-01.8E at 22:30 UTC January 1.
    Western North Pacific · Northern Mariana Islands
  3. HYDROPAC 306/232023-01-28 → 2023-07-18
    Discolored water with submarine volcanic activity reported in 20-25.20N 145-01.80E at 270127Z jan
    Western North Pacific · Northern Mariana Islands
  4. HYDROPAC 1305/142014-05-06 → 2014-05-29
    Cancel HYDROPAC 1304/14
    Western North Pacific · Mariana Islands
  5. NAVAREA XII 122/092009-03-04 → 2009-03-28
    Nga chart 502 (2ND ed)
  6. HYDROPAC 428/082008-03-04 → 2008-06-21
    Nga chart 81023 (5TH ed)
  7. HYDROPAC 32/062006-01-07 → 2008-02-10
    Discolored water reported vicinity 20-25.7N 144-59.4E at 061250Z jan
  8. HYDROPAC 1922/052005-11-17 → 2005-11-28
    Discolored water reported in 10-03.14N 162-45.75E
  9. HYDROPAC 1444/032003-08-22 → 2003-08-23
    Discolored water vicinity 24-17.8N 141-59.1E at 212320Z aug
  10. HYDROPAC 454/991999-05-23 → 2000-10-06
    Discolored water reported in 20-36N 145-14E
  11. HYDROPAC 86/991999-01-29 → 2000-10-06
    Discolored water reported in 20-31N 145-22E

Sea boundaries: Flanders Marine Institute (2018), IHO Sea Areas v3, marineregions.org (CC BY 4.0). Not for navigation — follow official NAVAREA / coastal broadcasts and your national MSI service.

Volcanic activity in the North Pacific Ocean · seahazards