O'a Caldera

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 7.47°N
  • 38.58°E

  • 2075 m
    6806 ft

  • 221280
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for O'a Caldera.

The Global Volcanism Program has no Weekly Reports available for O'a Caldera.

The Global Volcanism Program has no Bulletin Reports available for O'a Caldera.

The Global Volcanism Program is not aware of any Holocene eruptions from O'a Caldera. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the O'a Caldera 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.

Photo Gallery


The eastern (right) side of dumbbell-shaped Lake O'a (Lake Shalla) forms the 17-km-wide O'a caldera. Greenish-colored Lake Kunni (Lake Abiata) at the upper right lies NE of the Pleistocene caldera. Post-caldera activity produced pyroclastic cones north of the caldera. The small greenish Chitu maar on the SW side of the lake was erupted in an area of Holocene vents along the Corbetti-Shalla fissure system extending north from Corbetti caldera. Fumarolic activity continues on the southern and eastern shores of the lake.

NASA Space Shuttle image ISS001-363-7, 2001 (http://eol.jsc.nasa.gov/).
See title for photo information.

Smithsonian Sample Collections Database


There are no samples for O'a Caldera in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites