Lonquimay's northwest face
|Elevation||2,865 m (9,400 ft)|
|Last eruption||1988 to 1990|
Lonquimay Volcano is a stratovolcano of late-Pleistocene to dominantly Holocene age, with the shape of a truncated cone. The cone is largely andesitic, though basaltic and dacitic rocks are present. It is located in the La Araucanía Region of Chile, immediately SE of Tolhuaca volcano. Sierra Nevada and Llaima are their neighbors to the south. The snow-capped volcano lies within the protected area Malalcahuello-Nalcas.
The volcano's last eruption began on December 25, 1988, earning it the nickname "Navidad". The eruption lasted for 13 months before ending in 1990. The Volcanic Explositivy Index was 3, indicating tropospheric injections and catastrophic damage. The eruption was from a flank vent and involved mostly andesite lava, and had been preceded by increased seismicity for three weeks. The volume of the lava flow decreased as time went on and the vent dimensions decreased, though by the end of the eruption the andesite had still built up to a length of 10.2 km.
There was only a single fatality for the duration of the eruption, but it caused the evacuation of over 2000 people and caused extensive damage to farming and livestock in the surrounding region.
Research that models the internal architecture of the volcano indicate that Lonquimay has reached its maximum height and that any large eruption of lava will likely occur from flank vents and not from the summit.
- "Lonquimay." Global Volcanism Program. Smithsonian Institution
- "Lonquimay Volcano Eruptions". Volcano Discovery.
- Sparks (1992). "Morphological, structural, and textural variations in the 1988-1990 andesite lava of Lonquimay volcano, Chile". Cambridge University Geological Magazine.
- Naranjo, Jose. "Lonquimay." Global Volcanism Program. Smithsonian Institution National Museum of Natural History
- Contreras, María Angélica; Castruccio, Ángelo (2018). El control de las propiedades del sistema magmático en las dimensiones que alcanza un edificio volcánico: Análisis de los volcanes Lascar, Lonquimay y Llaima, Andes de Chile [The control of the properties of the magmatic system in the dimensions reached by a volcanic building: Analysis of the Lascar, Lonquimay and Llaima volcanoes, Andes of Chile]. XV Congreso Geológico Chileno (in Spanish). Concepción, Chile.
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