Socompa is a large stratovolcano at the border of Argentina and Chile with an elevation of 6,051 metres (19,852 ft) metres. Part of the Chilean and Argentine Andean Volcanic Belt (AVB), it is within the Central Volcanic Zone, one of the various segments of the AVB. This part of the Andean volcanic belt begins in Peru and runs first through Bolivia and Chile, and then through Argentina and Chile, and contains about 44 active volcanoes. Socompa lies close to the pass of the same name, where the Salta-Antofagasta railway crosses the border.
Socompa is known for its large debris avalanche, which was formed 7,200 years ago when most of the northwestern slope collapsed and slid down, forming an extensive deposit. It was at first considered to be either a moraine or a nuee ardende deposit, until the 1980 eruption of Mount St. Helens prompted awareness of the instability of volcanic edifices and the existence of large scale collapses on them. The Socompa collapse is among the largest known with a volume of 19.2 cubic kilometres (4.6 cu mi) and covers a surface area of 490 square kilometres (190 sq mi), and its features are well preserved by the arid climate. Notable are the large toreva blocks which were left behind within the collapse crater. After the landslide, the volcano was rebuilt by the effusion of lava flows and much of the scar is now filled in.
Socompa is also noteworthy for the high-altitude biotic communities that are bound to fumaroles on the mountain and form well above the regular vegetation in the region. The climate on the mountain is cold and dry.
^ abc"Argentina and Chile North Ultra-Prominences" Peaklist.org. Retrieved 25 February 2013.
^"Socompa". Andes Specialists. Retrieved 12 April 2020.
^Jorge González (2011). Historia del Montañismo Argentino.
^Federico Reichert (1967). En la cima de las montañas y de la vida.
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