Cerro Overo

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 23.52°S
  • 67.67°W

  • 4555 m
    14940 ft

  • 355097
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Cerro Overo.

The Global Volcanism Program has no Weekly Reports available for Cerro Overo.

The Global Volcanism Program has no Bulletin Reports available for Cerro Overo.

Volcano Types


Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Andesite / Basaltic Andesite


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

Geological Summary

The solitary Cerro Overo maar is located on the lower NE flank of Chiliques volcano, west of the Salar de Aguas Calientes. The youthful morphology of the maar suggests a possible Holocene age. The 600-m-wide, 80-m-deep mafic maar produced the least silicic youthful volcanic rocks found in this part of the central Andes.

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

The Global Volcanism Program has no synonyms or subfeatures listed for Cerro Overo.

Photo Gallery

Colachi (left) is an andesitic-dacitic stratovolcano whose most recent activity produced pristine silicic lava flows of probable Holocene age. The largest of these covers a 7 sq km area on the saddle between Colachi and the neighboring volcano of Acamarachi (center horizon). This aerial view from the west also shows the conical peak of Aguas Calientes (far right), a twin volcano of Lascar volcano, whose slopes appear at the lower right. The Talabre valley in the center foreground is partially filled by an andesitic lava flow from Lascar.

Photo by Insitituto Geográfico Militar, courtesy of Oscar González-Ferrán (University of Chile).
Cerro Overo maar in the foreground was formed by phreatomagmatic explosions. A thin, roughly 1.5-m-thick, dark-colored ejecta blanket surrounds the 600-m-wide, 80-m-deep maar. The maar is located on the lower NE flank of Volcán Chiliques and was erupted along a regional fault through basement ignimbrites of Pliocene age from the La Pacana caldera. On the horizon to the right is the east side of Tumisa and the dome "Negro de Barriales." On the left is the Lejia stratovolcano and caldera. Laguna Agua Caliente is at the right-center.

Photo by Instituto Geográfico Militar (courtesy of Oscar González-Ferrán, University of Chile).


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.

de Silva S L, 2007. . (pers. comm.).

de Silva S L, Francis P W, 1991. Volcanoes of the Central Andes. Berlin: Springer-Verlag, 216 p.

Gonzalez-Ferran O, 1995. Volcanes de Chile. Santiago: Instituto Geografico Militar, 635 p.

Affiliated Databases

Large Eruptions of Cerro Overo 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.