Pacific Tsunami Warning Center
Recorded as: PTWC
NOAA's tsunami warning centre in Hawaii, whose tsunami information after large earthquakes is relayed to ships.
Scientific and monitoring agencies issue warnings about their own work at sea — research vessels, moorings and seafloor instruments — or relay alerts about natural hazards such as tsunamis and space weather that affect ships.
What the archive holds
161 messages in this archive record PTWC as their authority, issued from 2007-01-21 to 2024-04-03. None of them is in force in the latest lists we collected.
Quakes accounts for 156 of 161 recorded messages (97%), the largest warning type group in this selection.
Attributed to NAVAREAs, they fall mostly in NAVAREA XII (32) and NAVAREA IV (9).
Located messages lie in 15 sea areas, most often South Pacific Ocean, North Pacific Ocean and Coral Sea.
The largest yearly count is 2021, with 22 messages. Collection is incomplete between 2024-05 and 2026-08-17, so those years are not comparable.
Across all years its messages are issued most often in January and least often in May.
They reached this archive through HYDROPAC (119), NAVAREA XII (32), NAVAREA IV (9) and HYDROLANT (1).
Messages by year of issue
By month of issue, all years
Warning types
Where
NAVAREA XII 32 · NAVAREA IV 9
Most recently issued
- HYDROPAC 1058/24 · Quakes2024-04-03Cancel HYDROPAC 1057/24 and this msg, tsunami warning cancelled
- HYDROPAC 1057/24 · Quakes · South China Sea2024-04-03Earthquake with preliminary magnitude of 7.5 occurred in 23-48.00N 121-42.00E at 022358Z apr
- HYDROPAC 1056/24 · Quakes · Philippine Sea2024-04-03Earthquake with magnitude of 7.5 has occurred in vicinity 23-48.00N 121-42.00E at 022358Z apr
- HYDROPAC 1000/24 · Quakes · South Pacific Ocean2024-03-27Earthquake with magnitude of 6.7 has occurred in vicinity 20-54S 173-48E at 270128Z mar
- HYDROPAC 11/24 · Quakes2024-01-01Cancel HYDROPAC 5/24 and this msg, tsunami warning canceled
- HYDROPAC 5/24 · Quakes · Japan Sea2024-01-01Earthquake with preliminary magnitude of 7.4 occurred in 37-30.00N 137-12.00E
- HYDROPAC 2/24 · Quakes · Japan Sea2024-01-01Earthquake with preliminary magnitude of 7.4 occurred in 37-30.00N 137-12.00E at 010710Z jan
- HYDROPAC 3845/23 · Quakes2023-12-07Cancel HYDROPAC 3843/23 and this msg
Earliest in the archive
Other scientific or monitoring agencys in NAVAREA XII
Counts are messages recording this issuer as their authority, recounted 2026-09-24; see coverage for what is collected. Not for navigation.