Volcanic

Nga chart 97521 (6TH ed)

Philippine Sea · HYDROPAC 375/10

What this record establishes

Archived notice · 2011-10-01 09:06Z

This notice comes from the historical archive. Its archived status does not establish when or how the reported situation ended.

Source and dates
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · NAVAREA XI 113/10 260738Z FEB 10.. Issued 2010-02-26 12:05Z. First collected 2026-08-17 13:38Z; last seen in collection 2026-08-17 15:46Z. Collection dates record ingestion, not a new incident or a fresh field observation.
Location covered
Philippine Sea. The parsed report position is 24.288, 141.480. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.

Related notices and cancellation links

These reports were linked by category and sea, with positions within 30 nautical miles and issue dates within 30 days of another report's recorded in-force span. Links can extend through other members, so the full group can cover a larger area or period. Proximity does not confirm that they describe one incident.

  1. HYDROPAC 1921/062006-10-04 · Archived notice
  2. HYDROPAC 2225/062006-11-16 · Archived notice
  3. HYDROPAC 2271/062006-11-22 · Archived notice
  4. HYDROPAC 2414/062006-12-11 · Archived notice
  5. HYDROPAC 151/072007-01-23 · Archived notice
  6. HYDROPAC 155/072007-01-23 · Archived notice
Compare all 20 notices, changes and original texts →

Current notices and reporting history in the Philippine Sea →

issued
2010-02-26 12:05Z
status
Archived notice
authority
NAVAREA XI 113/10 260738Z FEB 10.
NAVAREA
NAVAREA XI · named as the source of this relay
sea
Philippine Sea
position
24.288, 141.480
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

NORTH PACIFIC.
NGA CHART 97521 (6TH ED).
1. DISCOLORED WATER WITH SUBMARINE VOLCANIC ACTIVITY
   REPORTED IN 24-17.3N 141-28.8E AT 250455Z FEB.
2. CANCEL HYDROPAC 249/10.

Reading this warning

Chart reference
The number of the nautical chart on which the reported position lies.
Discoloured water
Patches of unusually coloured sea — often a sign of a submarine volcano or of a shoal.
Volcanic activity
An erupting or restless volcano near or under the sea, with a keep-clear radius around it.
Position (degrees and minutes)
How warnings write positions: degrees, a hyphen, then minutes, with N/S and E/W — 49-40.8N 003-43.8W.
Date-time group (DTG)
A compact UTC timestamp — day, hour and minute followed by Z — such as 201500Z for the 20th at 15:00 UTC.
Cancellation reference
A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
HYDROPAC
The U.S. long-range warning series for the Pacific outside NAVAREA XII and for the Indian Ocean, Persian Gulf and adjoining seas.

All warning terms →

Collected reports in this area · volcanic activity

59 within 180 nm since 1996 · 0 in the last 12 months · 5 listed in force now

96
00
05
10
15
20
25

Counts include repeat notices about the same situation. NGA archive coverage ends 2024-05; live collection began 2026-08-17. The period between them is incomplete. An empty year is not evidence that no hazards occurred.

Month of issue in the collected archive

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

All available years combined. Uneven collection and repeat bulletins affect these counts; this chart does not measure the seasonality or probability of incidents.

Nearby notices listed in force · within 120 nm

Worldwide in the collected sources

12 volcanic activity listed in force · see all

Record snapshot 2026-10-01 23:31Z; source collection times vary.

Volcanic

Submarine eruptions, discoloured water, pumice rafts. All current volcanic activity →

Not for navigation. This is a re-rendering of an official navigational warning for awareness; mariners must use official NAVAREA broadcasts and their national MSI service.