Ahyi, United States
Ahyi is a submarine volcano in the United States, -75 m (-246 ft) high. Its last known eruption: undated, but a probable Holocene eruption. NOAA records no significant eruption here.
Ahyi on the map
Ahyi and the volcanoes within 300 km, colored by when each last erupted.
- Since 1964
- 1900 to 1963
- 1800s
- AD 1 to 1799
- Before AD 1, or undated
Now
From the USGS Volcano Hazards Program, read 15:32 UTC. USGS threat ranking: Very Low Threat.
Advisory / Yellow USGS, Northern Mariana Islands rates Ahyi at alert level Advisory, aviation color code Yellow, since 2026-09-18 00:41 UTC.
NMI Ahyi Seamount YELLOW/ADVISORY - No plumes seen in satellite images; no significant geophysical signals.
Notices this week
- 2026-09-18 00:41 UTC: Weekly Update, USGS, Northern Mariana Islands
The volcano
- Type
- Submarine volcano
- Elevation
- -75 m (-246 ft)
- Country
- United States
- Region
- Mariana Is-C Pacific
- Summit
- 20.420° N, 145.030° E
- Last known eruption
- Undated, but a probable Holocene eruption
- Holocene activity known from
- Uncertain
- Smithsonian volcano number
- 284141
Significant eruptions
NOAA records eruptions that killed, did damage, were very large, or set off a tsunami or earthquake.
None on record.
Around it
The volcanoes within 300 km.
Earthquakes near AhyiVolcanic ash advisories on the live map
Sources
Volcanoes and significant eruptions from NOAA’s National Centers for Environmental Information, Global Historical Hazard Database, cited as NCEI/WDS, doi:10.7289/V5PN93H7. Public domain. Read 2026-09-24. Alert levels, color codes and notices from the USGS Volcano Hazards Program and its observatories, public domain. Volcano numbers are the Smithsonian Institution’s Global Volcanism Program’s.