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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 9.35°S
  • 159.73°E

  • 1000 m
    3280 ft

  • 255062
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Gallego.

The Global Volcanism Program has no Weekly Reports available for Gallego.

The Global Volcanism Program has no Bulletin Reports available for Gallego.

Volcano Types

Volcanic field

Tectonic Setting

Subduction zone
Crustal thickness unknown

Rock Types

Andesite / Basaltic Andesite


Within 5 km
Within 10 km
Within 30 km
Within 100 km

Geological Summary

The Pliocene-to-Quaternary Gallego volcanics, comprising a group of steeply dissected cones, cover a large area of NW Guadalcanal Island (Hackman, 1980). Mount Roundhead is a small, but well-preserved volcano. Local traditions mention an historical eruption, but this could refer to an eruption from Savo volcano (1991 pers. comm. from Coleman to R W Johnson). The International Association of Volcanology and Chemistry of the Earth's Interior (1973) considered andesitic Mount Esperance to have been active during the past 2000 years.

The Global Volcanism Program is not aware of any Holocene eruptions from Gallego. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Gallego page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.


Feature Name Feature Type Elevation Latitude Longitude
Esperance, Mount Cone 600 m 9° 16' 0" S 159° 42' 0" E
Paru, Mount Cone 550 m 9° 19' 0" S 159° 41' 0" E
Popori, Mount Cone 900 m 9° 20' 0" S 159° 38' 0" E
Roundhead, Mount Cone 9° 16' 0" S 159° 43' 0" E

Photo Gallery

The Pliocene-to-Quaternary Gallego volcanics cover a large area of NW Guadalcanal Island along the top part of this NASA Space Shuttle image with north to the upper right. Local traditions mention a historical eruption from Mount Roundhead, but this could refer to an eruption from Savo volcano, the island at the upper right. Mount Esperance volcano rises above Cape Esperance, across the channel from Savo Island. The city of Honiara lies along the northern coast of Guadalcanal Island at the lower right.

NASA Space Shuttle image ISS002-727A-10, 2001 (


The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. 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.

Hackman B D, 1980. The geology of Guadalcanal, Solomon Islands. Brit Inst Geol Sci Overseas Mem, no 6.

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Johnson R W, 1991. . (pers. comm.).

Affiliated Databases

Large Eruptions of Gallego Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.