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  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 21.15°S
  • 175.75°W

  • -65 m
    -213 ft

  • 243011
  • Latitude
  • Longitude

  • Summit

  • Volcano

There are no activity reports for Unnamed.

 Available Weekly Reports

There are no Weekly Reports available for Unnamed.

There are no Holocene eruptions known for Unnamed. If this volcano has had large eruptions prior to 10,000 years ago, information might be found in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title. Additional discussion of data sources can be found under Volcano Data Criteria.

Hekinian R, Muhe R, Worthington T J, Stoffers P, 2008. Geology of a submarine volcanic caldera in the Tonga Arc: dive results. J Volc Geotherm Res, 176: 571-582.

Stoffers P, Worthington T J, Schwarz-Schampera U, Hannington M D, Massoth G J, Hekinian R, Schmidt M, Lundsten L J, Evans L J, Vaiomo'unga R, Kerby T, 2006. Submarine volcanoes and high-temperature hydrothermal venting on the Tonga arc, southwest Pacific. Geology, 34: 453-456.

A large submarine volcano rises to within 65 m of the sea surface west of Tongatapu Island. The volcano was informally named Volcano #1 by the scientists on the bathymetric survey that discovered the submarine volcano in 2003. The summit of the andesitic-to-dacitic volcano is cut by a large 7 x 4.5 km wide caldera, with two young scoria cones forming the high point of the seamount. A chain of explosion craters up to 100 m deep cut the flank of one of the scoria cones, and thick deposits of ash and scoria blanket the caldera floor nearby. The lack of organic sediments between volcaniclastic deposits exposed in one portion of the caldera wall suggest it was constructed within the past 200 years. Diffuse low-temperature hydrothermal vents and vigorous gas discharge occurs near the explosion craters.