Global Volcanism Program
Por um escritor misterioso
Descrição
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
Smithsonian's Global Volcanism Program Collage
4 Seismic map of the 2018 eruption The Global Volcanism Program has
Map of study area. (a) Regional map of Chile and Argentina with
Global Volcanism Program
Volcanoes of the World - Global Volcanism Program
Global Volcanism Program
Global Volcanism Program
Global Volcanism Program, Sheveluch
Global Volcanism Program
Global map indicating volcanic provinces used in this study, and
Global Volcanism Program
World map showing location of the volcanoes and countries represented