Global Volcanism Program

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. The eastern summit crater, part of a 2-km-long, ENE-WSW line of nine craters, contains a briny, acidic 300-m-wide crater lake (also referred to as El Agrio or Del Agrio) 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. Infrequent mild-to-moderate explosive eruptions have been recorded since the 18th century. Twentieth-century eruptions from the crater lake have ejected pyroclastic rocks and chilled liquid sulfur fragments.

Global Volcanism Program, St. Helens

Global Volcanism Program

Global Volcanism Program

Timeline of eruption history based on the Global Volcanism Program

Global Volcanism Program

Global Volcanism Program Smithsonian / USGS Weekly Volcanic Activity Report

Top) Global distribution of subaerial volcanoes in different tectonic

Timeline of eruption history based on the Global Volcanism Program

Map of study area. (a) Regional map of Chile and Argentina with

Global Volcanism Program

of ∼ 319 Latin American Holocene volcanoes from (Global Volcanism

Map of active volcanoes of the Earth and plate tectonic boundaries.

Smithsonian Institution - Global Volcanism Program: Worldwide Holocene Volcano and Eruption Information