About Unnamed
Unnamed is a stratovolcano rising to -68 meters (-223 feet) in Tonga's Tonga-Kermadec Volcanic Regions. It last erupted in 1932 CE, and volcanologists consider it an active volcanic system. The volcano has produced 2 recorded eruptions.
Geography & Climate
Unnamed is located in Tonga, within the Tofua Volcanic Arc of the broader Tonga-Kermadec Volcanic Regions. Situated at 21.34° S, 175.65° W in the Southern Hemisphere, the volcano lies within a tropical climate zone. With an elevation of -68 meters — below sea level — Unnamed is a submarine or submerged volcanic feature. Submarine volcanoes make up the majority of Earth's volcanic activity, though most eruptions go unobserved beneath the ocean surface. The volcanic landform is characterized as a composite, which describes the physical shape and structure of the volcanic edifice as observed from the surface.
Geological Context
Unnamed sits in a subduction zone, where one tectonic plate dives beneath another, creating intense heat and pressure that generates magma. Subduction zones are responsible for many of the world's most explosive volcanoes and deadliest eruptions. For communities in Tonga near Unnamed, this tectonic setting means the volcano is capable of producing powerful explosive eruptions, pyroclastic flows, and lahars that can threaten populated areas within tens of kilometers of the summit. The dominant rock type is no data (checked), which influences the viscosity of the magma and, consequently, the style of eruptions this volcano produces. Rock chemistry is one of the most important factors in determining whether a volcano erupts explosively or effusively.
Eruption History Summary
Unnamed has 2 recorded eruptions in the geological database, spanning from 1907 CE to 1932 CE. These eruptions span roughly 25 years of volcanic history. The most recent eruption in 1932 CE places this volcano within the modern era of volcanological observation.
GVP Reference Summary
During a submarine eruption in 1907 pyroclastic material was ejected to 100 m above the ocean surface, and pumice rafts were produced. The eruption was located approximately (on Admiralty Chart 2421) 48 km SW of Tongatapu Island, along the Tofua volcanic arc. The location given in this catalog has been shifted 5 km N relative to the 1907 report, to a seamount that rises to within 100 m of the ocean surface, because the previous spot corresponds to sloping terrain at 1,800 m depth on a 1982 bathymetric map. A second eruption from this area was reported in late 1932. This seamount may be the SE part of a larger edifice extending about 15 km NW, informally designated as "Volcano 2" (R/V Sonne 167 survey).
— Smithsonian Institution, Global Volcanism Program
2 Recorded Eruptions
| Year | VEI | Type | Area |
|---|---|---|---|
| 1932 | 0 | Confirmed Eruption | — |
| 1907 | 0 | Confirmed Eruption | — |
Real-Time Data
USGS Alert Level
Thermal Anomalies
Frequently Asked Questions About Unnamed
Is Unnamed an active volcano?+
Yes, Unnamed is considered an active volcano. Its most recent eruption was in 1932 CE. The volcano is monitored by geological agencies, and its activity status is based on observed eruptions within recorded history.
When did Unnamed last erupt?+
The most recent recorded eruption of Unnamed occurred in 1932 CE with a Volcanic Explosivity Index (VEI) of 0. The eruption was classified as a "Confirmed Eruption." Unnamed has 2 recorded eruptions in total.
How high is Unnamed?+
Unnamed has a summit elevation of -68 meters (-223 feet) above sea level. With an elevation of -68 meters (below sea level), this is a submarine or submerged volcanic feature.
What type of volcano is Unnamed?+
Unnamed is classified as a Stratovolcano. Stratovolcanoes (also called composite volcanoes) are steep, conical volcanoes built up by many layers of hardened lava, tephra, and volcanic ash. They are among the most common and dangerous types, known for explosive eruptions.
Where is Unnamed located?+
Unnamed is located in Tonga, in the Tonga-Kermadec Volcanic Regions. More specifically, it lies within the Tofua Volcanic Arc. Its exact coordinates are -21.338° latitude, -175.650° longitude.
Is it safe to visit Unnamed?+
Visiting Unnamed requires checking current volcanic activity and alert levels. As an active volcano with eruptions as recent as 1932 CE, conditions can change rapidly. Always consult local geological authorities and follow official warnings before visiting. Many active volcanoes have designated safe viewing areas and guided tour options.
