Volcanic

Discolored water with submarine volcanic activity is reported near Northern Mariana Islands at 15-37N 145-34E on September 19 at 03:06 UTC.

Western North Pacific · Northern Mariana Islands · HYDROPAC 2986/23

issued: 2023-09-19 04:11Z
status: cancelled 2026-08-14 18:10Z (dropped from inforce)
authority: US GEOLOGICAL SURVEY 180/23 190356Z SEP 23.
sea: Philippine Sea
position: 15.617, 145.567
source: nga_json · first seen 2026-08-17 13:41Z

Original warning text

WESTERN NORTH PACIFIC.
NORTHERN MARIANA ISLANDS.
DNC 12.
DISCOLORED WATER WITH SUBMARINE VOLCANIC
ACTIVITY REPORTED IN 15-37.00N 145-34.00E
AT 190306Z SEP.

This area · volcanic activity

1 within 180 nm since 2023 · 0 in the last 12 months · 0 in force now

Season · when volcanic activity happen here

month of issue, all years in the archive

Nearby now · within 120 nm

Due to tropical storm bavi: 1. the following port(s) are closed: a. rota island 14-08.35N 145-08.09EOther · 89.4 nm

Worldwide now

12 volcanic activity in force · see all

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.