Cerro Overo

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 23.52°S
  • 67.67°W

  • 4555 m
    14940 ft

  • 355097
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

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.

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

Eruptive History


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).

Deformation History


There is data available for 2 deformation periods. Expand each entry for additional details.


Deformation during 2003 - 2010 [Uplift; Observed by InSAR]

Start Date: 2003 Stop Date: 2010 Direction: Uplift Method: InSAR
Magnitude: Unknown Spatial Extent: 20.00 km Latitude: -24.000 Longitude: -67.000

Remarks: Deformation east of Cerro Overo alternated from subsidence between 1992 and 2003 to uplift from 2003 to at least 2010.

Deformation at Cerro Overo. Maps showing collocated subsidence and uplift from individual interferograms spanning different dates. Black triangles are from de Silva and Francis [1991], the white triangle marks the location of Cordon Puntas Negras from Siebert et al. [2011]. The gray dotted line is a major international route between Argentina and Chile known as ?Paso Sico.? The diameter of the deforming region is approximated by the red dashed outline. Time series deformation history from track 10 is shown at the bottom, with ?4 mm/yr average subsidence between 1992 and 2003, followed by 5 mm/yr uplift through 2010.

From: Henderson and Pritchard 2013.


Reference List: Henderson and Pritchard 2013.

Full References:

Henderson, S. T., and M. E. Pritchard, 2013. Decadal volcanic deformation in the central Andes volcanic zone revealed by InSAR time series. Geochem. Geophys. Geosyst., 14, doi:10.1002.ggge.20074.

Deformation during 1992 - 2003 [Subsidence; Observed by InSAR]

Start Date: 1992 Stop Date: 2003 Direction: Subsidence Method: InSAR
Magnitude: Unknown Spatial Extent: 20.00 km Latitude: -24.000 Longitude: -67.000

Remarks: Deformation east of Cerro Overo alternated from subsidence between 1992 and 2003 to uplift from 2003 to at least 2010.

Deformation at Cerro Overo. Maps showing collocated subsidence and uplift from individual interferograms spanning different dates. Black triangles are from de Silva and Francis [1991], the white triangle marks the location of Cordon Puntas Negras from Siebert et al. [2011]. The gray dotted line is a major international route between Argentina and Chile known as ?Paso Sico.? The diameter of the deforming region is approximated by the red dashed outline. Time series deformation history from track 10 is shown at the bottom, with ?4 mm/yr average subsidence between 1992 and 2003, followed by 5 mm/yr uplift through 2010.

From: Henderson and Pritchard 2013.


Reference List: Henderson and Pritchard 2013.

Full References:

Henderson, S. T., and M. E. Pritchard, 2013. Decadal volcanic deformation in the central Andes volcanic zone revealed by InSAR time series. Geochem. Geophys. Geosyst., 14, doi:10.1002.ggge.20074.

Emission History


There is no Emissions History data available 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).
See title for photo information.
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).
See title for photo information.

Smithsonian Sample Collections Database


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

Affiliated Sites