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Copahue ({{#invoke:IPA|main}}) 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 Template:Convert 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.<ref name=Naranjo /> Eruptions from this crater lake have ejected pyroclastic rocks and chilled liquid sulfur fragments.<ref name=gvp/> Although the lake emptied during the 2000 eruption, it later returned to its previous levels. Copahue means "sulphur waters" in Mapuche.<ref name="BBC"/>
Copahue sits on a basement of sedimentary and volcanic rocks ranging in age from Eocene to Pliocene.<ref name=Naranjo>Template:Cite journal</ref> 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).<ref name=Naranjo /> The modern caldera formed 0.6 to 0.4 Ma, and produced large pyroclastic flows, extending up to 37 km from the volcano.<ref name=Naranjo />
The modern structure is an elongated shield volcano, with a maximum thickness of 22 km and a minimum of 8 km.<ref name=Naranjo /> It has erupted ten times since 1900, most recently in March 2016.<ref name="gvp" /><ref name="BBC">Template:Cite news</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> 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.<ref name="sky">Template:Cite news</ref>
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- Template:Cite book (in Spanish; also includes volcanoes of Argentina, Bolivia, and Peru)
- Template:Cite book
