Supply Reef, United States
Supply Reef is a submarine volcano in the United States, -8 m (-26 ft) high. Its last known eruption: 1964 or later. NOAA records no significant eruption here.
Supply Reef on the map
Supply Reef 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.
Unassigned / Unassigned USGS, Northern Mariana Islands rates Supply Reef at alert level Unassigned, aviation color code Unassigned.
The volcano
- Type
- Submarine volcano
- Elevation
- -8 m (-26 ft)
- Country
- United States
- Region
- Mariana Is-C Pacific
- Summit
- 20.130° N, 145.100° E
- Last known eruption
- 1964 or later
- Holocene activity known from
- Hydrophonic
- Smithsonian volcano number
- 284142
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 Supply ReefVolcanic 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.