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| Puyehue (volcano) | |
|---|---|
| Name | Puyehue |
| Elevation m | 2236 |
| Location | Andes, Los Ríos Region, Los Lagos Region, Chile |
| Type | Stratovolcano complex |
| Last eruption | 2012 |
Puyehue (volcano) is a stratovolcanic complex in the Andes of southern Chile, straddling the Los Ríos Region and Los Lagos Region near the Argentina–Chile border. The massif lies within the Puyehue National Park and is part of the southern segment of the Southern Volcanic Zone of the Andean Volcanic Belt, sharing tectonic context with features such as Lanín Volcano, Osorno Volcano, and the Cayambe-Coca complex. Its activity has influenced neighboring landscapes including the Bueno River, Ranco Lake, and the Seven Lakes corridor near Osorno Province and Río Negro Province in Argentina.
The complex sits on the overriding South American Plate above the subducting Nazca Plate and lies near the trench-related volcanic chain that includes Villarrica, Llaima, and Quetrupillán. The edifice comprises multiple cones, domes, and the Cordón Caulle fissure system, formed on basement rocks of the Chilean Central Andes and Pleistocene volcanic deposits linked to Quaternary volcanism. Glacial geomorphology shows cirques and moraines like those studied near Antuco, while local hydrothermal alteration connects to mineral occurrences analogous to deposits at El Teniente and Escondida. Petrology indicates andesitic to dacitic compositions similar to magmas from Calbuco and Puyehue-Cordón Caulle complexes, with geochemical signatures reflecting slab-fluid metasomatism observed across the Southern Volcanic Zone.
Puyehue has produced eruptions throughout the Holocene, with major explosive events recorded in stratigraphic sequences comparable to eruptions of Huaynaputina, Toba (for scale), and regional deposits attributed to Río Bueno tephra layers. Tephrochronology links widespread ash layers to settlements around Valdivia, Osorno, and San Carlos de Bariloche in Argentina, and correlates with palaeoclimate proxies used in studies at Lago Puyehue, Lago Ranco, and Lago Llanquihue. Historical activity includes documented 20th-century unrest resembling episodes at Karymsky and Shiveluch in the Kamchatka Peninsula, while the 1960 eruption sequence provides comparative data with the 1960 Great Chilean Earthquake effects on volcanic systems.
The 2011–2012 explosive eruption originated at the Cordón Caulle fissure system, producing a high-altitude ash plume that disrupted aviation across the South Pacific and South Atlantic air routes, affecting cities such as Santiago, Buenos Aires, Melbourne, Auckland, and São Paulo through rerouting and cancellations similar to the 2010 Eyjafjallajökull disruption. Ashfall reached provinces including Ranco, Osorno, and Neuquén Province and deposited tephra layers studied near Bariloche and Villa La Angostura. The eruption produced pyroclastic flows and lahars impacting drainage basins feeding the Pilmaiquén River and altered tourism patterns to Pucon and Puerto Varas. International scientific response involved teams from institutions such as the Servicio Nacional de Geología y Minería (SERNAGEOMIN), Instituto Nacional de Prevención Sísmica (INPRES), Smithsonian Institution, US Geological Survey, and universities including University of Chile and Universidad Austral de Chile.
Vegetation on Puyehue transitions from Valdivian temperate rainforest with species like Nothofagus dombeyi and Araucaria araucana in adjacent ranges to subalpine and alpine communities near summit areas, akin to flora in Nahuel Huapi National Park and Huerquehue National Park. Fauna includes populations of Puma concolor observed across the Andean temperate forests and bird species found in the Chilean seashore to Andean gradients similar to records from Chiloé Island and Corcovado National Park. Pleistocene and Holocene glaciation left cirque glaciers and perennial snowfields comparable to remnants on Villarrica and Lanín, with documented retreat patterns paralleling glaciers in the Southern Patagonian Ice Field and studies at Glaciar Perito Moreno and Glaciar San Rafael. Post-eruption ecological succession followed patterns recorded after events at Mount St. Helens and Chaitén, with primary succession on tephra and soil horizons investigated by researchers from CONAF and regional universities.
Local communities in Río Bueno, Futrono, Río Negro, and towns like Osorno and Bariloche experienced ashfall, infrastructure damage, and agricultural losses similar to historical impacts in eruptions at Nevados de Chillán and Calbuco. Evacuations and public health measures involved municipal authorities, provincial governments of Los Ríos Region and Los Lagos Region, and national agencies including ONEMI and SERNAGEOMIN, coordinated with international aid organizations such as Red Cross branches. Economic effects influenced timber operations near Cordillera de los Andes, salmon farming on Reloncaví Sound, and transport corridors like the Pan-American Highway, with parallels to disruptions after events at Mount Pinatubo and Mount Ruapehu.
Monitoring networks around the complex combine seismic arrays, GPS stations, gas emission sensors, and satellite remote sensing from platforms like Landsat, Sentinel-1, and MODIS, with data processed by agencies including SERNAGEOMIN, Servicio Hidrográfico y Oceanográfico de la Armada de Chile (SHOA), and research groups at University of Chile and Universidad de Concepción. Hazard mitigation incorporates zonation maps, early warning protocols developed after lessons from Chaitén and Eyjafjallajökull, and community preparedness programs run by ONEMI and local municipalities, alongside international collaboration through networks such as the Global Volcanism Program and the International Association of Volcanology and Chemistry of the Earth's Interior.
Category:Volcanoes of Los Ríos Region Category:Stratovolcanoes of Chile Category:Andean Volcanic Belt