Copahue volcano is an active stratovolcano in central Chile at the border with Argentina. The volcano has a 6.5 x 8.5 km wide caldera with several craters aligned on a 2 km ENE-WSW trending zone.
The eastern summit crater has an acid 300 m wide crater lake known as El Agrio or Del Agrio which has intense hydrothermal activity.
Infrequent mild-to-moderate explosive eruptions occurred in historic time. Eruptions in the last century have ejected pyroclastic rocks and chilled liquid sulfur fragments. The last one was in 2000.
stratovolcano 2997 m / 9,833 ft
Chile/Argentina, -37.85°S / -71.17°W
Activity, both internal and external, has picked up at the volcano. Small, intermittent ash emissions have been observed during the past days, accompanied by a significant increase in tremor related to fluid movements within the volcanic edifice. ...more
During an overflight on 13 Sep, SERNAGEOMIN scientists had found that the acid lake was still present in the El Agrio crater, despite the incandescence visible sometimes at night caused by hot gasses. Fresh sulphur deposits were seen covering snow around the crater, suggesting that at least some part of the erupted gasses originate from magma underneath and not only from the shallow hydrothermal system. Signs of small phreatic explosions were also detected, SERNAGEOMIN reported in a bulletin on 22 Sep. Between 13 and 22 September, the Lake level began to decrease. Volcanologists believe that the reason for these phenomena is that magma has migrated closer to the surface, although not reached it yet. Whether or not it will, remains to be seen. [less]
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