Wednesday, Jun 12, 2013
Seismic activity has dropped sharply from 13 events / hour to only one per hour during only 9 hours. No corresponding changes were observed at the surface. The volcano continues to emit a small plume of steam and gas. [more]
Monday, Jun 10, 2013
Seismic and degassing activity have decreased, although SERNAGEOMIN maintains alert level "orange". A total of 120 quakes, mostly near the surface, were counted during 8-9 June. No volcanic tremor was detected. A white steam and gas plume was rising 300 m from the crater. ... [more]
Copahue volcanoCopahue 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.
Background:Volcán Copahue is an elongated composite cone constructed along the Chile-Argentina border within the 6.5 x 8.5 km wide Trapa-Trapa caldera that formed between 0.6 and 0.4 million years ago near the NW margin of the 20 x 15 km Pliocene Caviahue (Del Agrio) caldera. and displays intense fumarolic activity. Acidic hot springs occur below the eastern outlet of the crater lake, contributing to the acidity of the Río Agrio, and another geothermal zone is located within Caviahue caldera about 7 km NE of the summit.
(Smithsonian / GVP volcano information)