Scientific or monitoring agency · United States

U.S. Geological Survey — National Earthquake Information Center

Recorded as: USGS NEIC

Earthquakes at sea of magnitude 5.5 and above, collected by seahazards from the USGS event service; tsunami flags are carried with each event.

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

13,049 messages in this archive record USGS NEIC as their authority, issued from 1997-01-02 to 2026-09-23. 1 of them is in force in the latest lists we collected.

Quakes accounts for 13,049 of 13,049 recorded messages (100%), the largest warning type group in this selection.

Located messages lie in 64 sea areas, most often South Pacific Ocean, North Pacific Ocean and Indian Ocean.

The largest yearly count is 2011, with 663 messages. Collection is incomplete between 2024-05 and 2026-08-17, so those years are not comparable.

They reached this archive through USGS (13,049).

Messages by year of issue

'97
'98
'99
'00
'01
'02
'03
'04
'05
'06
'07
'08
'09
'10
'11
'12
'13
'14
'15
'16
'17
'18
'19
'20
'21
'22
'23
'24
'25
'26

By month of issue, all years

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Warning types

Where

Newest in force · 1

  1. USGS-US6000TX3M · Quakes · South Pacific Ocean2026-09-23 · in force
    180 km nw of hihifo, tonga

Most recently issued

  1. USGS-US7000TIUR · Quakes · Flores Sea2026-09-21
    35 km nne of ruteng, indonesia
  2. USGS-US7000TIT5 · Quakes · Indian Ocean2026-09-20
    Earthquake magnitude 5.7 (mww) in 48.428S 031.235E, depth 10 km at 202054Z sep 26
  3. USGS-US7000TIQC · Quakes · Bismarck Sea2026-09-20
    49 km nne of kainantu, papua new guinea
  4. USGS-US7000TIGD · Quakes · South Pacific Ocean2026-09-18
    Earthquake magnitude 5.5 (mww) in 27.858S 177.229W, depth 94 km at 182318Z sep 26
  5. USGS-US7000TI1P · Quakes · Bering Sea2026-09-17
    169 km w of nikolski, alaska
  6. USGS-US7000THCS · Quakes · Molukka Sea2026-09-14
    78 km nne of tobelo, indonesia
  7. USGS-US7000THC6 · Quakes · Indian Ocean2026-09-14
    187 km ssw of pelabuhanratu, indonesia

Earliest in the archive

  1. USGS-USP0007VAQ · Quakes · Molukka Sea1997-01-01
    112 km se of gorontalo, indonesia

Other scientific or monitoring agencys

Counts are messages recording this issuer as their authority, recounted 2026-09-24; see coverage for what is collected. Not for navigation.