Copahue (Spanish pronunciation: [koˈpawe]) is a stratovolcano in the Andes on the border of Bío Bío Region, Chile and Neuquén Province, Argentina. There are nine volcanic craters along a 2 km (1.2 mi) line, the easternmost of which is historically the most active, and contains a 300 m (1000 ft) wide crater lake with a pH ranging between 0.18 and 0.30.[2] Eruptions from this crater lake have ejected pyroclastic rocks and chilled liquid sulfur fragments.[1] Although the lake emptied during the 2000 eruption, it later returned to its previous levels. Copahue means "sulphur waters" in Mapuche.[3]

Astronaut Photography of Earth - Quick View - Copahue Volcano.PNG
Copahue Volcano photographed from space
Highest point
Elevation2,997 m (9,833 ft) [1]
Coordinates37°51′S 71°10′W / 37.850°S 71.167°W / -37.850; -71.167Coordinates: 37°51′S 71°10′W / 37.850°S 71.167°W / -37.850; -71.167[1]
Copahue is located in Chile
LocationNeuquén Province,
 Argentina Bío Bío Region,
Parent rangeAndes
Mountain typeStratovolcano
Last eruptionJanuary 6, 2016[1]

Copahue sits on a basement of sedimentary and volcanic rocks ranging in age from Eocene to Pliocene.[2] The modern volcano sits in a volcanically active area, with a caldera from the Pliocene, measuring 20 km by 15 km, lying to the east of Copahue. The modern volcano became active roughly 1.2 million years ago (Ma).[2] The modern caldera formed 0.6 to 0.4 Ma, and produced large pyroclastic flows, extending up to 37 km from the volcano.[2]

Satellite image of the December 2012 eruption

The modern structure is an elongated shield volcano, with a maximum thickness of 22 km and a minimum of 8 km.[2] It has erupted ten times since 1900, most recently in March 2016.[1][3][4] On 27 May 2013, it was reported that a red alert had been issued and the evacuation of around 2,000 people was to begin.[5]

The crater lake at the eastern summit of Copahue Volcano.
Copahue Crater Lake.

See alsoEdit


  1. ^ a b c d e "Copahue". Global Volcanism Program. Smithsonian Institution. Retrieved 2005-02-11.
  2. ^ a b c d e Naranjo, Jose; Polanco, Edmundo (2004). "The 2000 AD eruption of Copahue Volcano, Southern Andes". Revista Geológica de Chile. 31 (2): 279–292.
  3. ^ a b "Chile and Argentina on alert over Copahue volcano eruption". BBC News. 23 December 2012.
  4. ^ [1]
  5. ^ "Red Alert Issued For Chile Volcano". Sky News. 27 May 2013.


External linksEdit