Volcano · United States (Mariana Is.)

Ahyi Seamount

An underwater volcano whose eruptions are heard by hydrophones.

Status right now

USGS alert level: AdvisoryAviation code: Yellow

From the Northern Mariana Islands. Latest notice.

Checked 4 Nov 2026, 22:38 UTC.

Key facts

Country: United States (Mariana Is.)
Region: Pacific
Type: Submarine
Summit: -75 m (-246 ft) below sea level
Coordinates: 20.420° N, 145.030° E
Smithsonian number: 284141
USGS page: usgs.gov/volcanoes/ahyi

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What kind of volcano is it?

Ahyi Seamount is a submarine. A submarine volcano erupts below the sea surface. Eruptions can discolour the water, float rafts of pumice and, when the vent is shallow, break the surface in steam-driven explosions.

Eruption history

NOAA's Global Significant Volcanic Eruptions Database lists no significant eruptions here. It records eruptions that caused deaths, notable damage or a tsunami, or that were very large (VEI 6 or more), so many smaller eruptions are not in it. The Smithsonian record for Ahyi Seamount lists every known eruption.

Nearby volcanoes

FujiJapan · 1,772 km
SuwanosejimaJapan · 1,850 km
AsamaJapan · 1,887 km
SakurajimaJapan · 1,896 km
AsoJapan · 1,954 km
MayonPhilippines · 2,404 km

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Ahyi Seamount: quick answers

Where is Ahyi Seamount?

Ahyi Seamount is in United States (Mariana Is.), at 20.420° N, 145.030° E.

How high is Ahyi Seamount?

Its summit is -75 metres (-246 feet) below sea level.

What type of volcano is Ahyi Seamount?

Is Ahyi Seamount erupting right now?

The status at the top of this page is checked several times a day against the Smithsonian Global Volcanism Program’s weekly report, the USGS and GDACS. For safety information and official alerts, always follow the local volcano observatory and authorities.