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.

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

Volcanoes of the World - Global Volcanism Program

Timeline of eruption history based on the Global Volcanism Program

Global Volcanism Program

Number of unique volcanic hazard maps in the database sorted by Global

Plume from Lascar volcano, April 1993 eruption. NOAA image. (Source

Global Volcanism Program

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

Global Volcanism Program

a) The Danakil depression in northern Afar with Holocene volcano

Global Volcanism Program

Global Volcanism Program

Global Volcanism Program - Interested in what volcanoes are active? The GVP Current Eruptions page lists all of the ongoing eruptions (43 as of 13 July), with links back to each volcano

Global Volcanism Program

Holocene active volcanoes (Global Volcanism Program of the Smithsonian