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| 1999 eruption of the Chaitén volcano | |
|---|---|
| Name | Chaitén |
| Location | Los Lagos Region, Chile |
| Coordinates | 42°51′S 72°41′W |
| Elevation | 1,122 m |
| Type | Caldera / Felsic lava dome |
| Last eruption | 1999, 2008–2009 |
1999 eruption of the Chaitén volcano The 1999 eruption of the Chaitén volcano was a sudden explosive event that occurred near the town of Chaitén in southern Chile and preceded the larger 2008–2009 crisis, involving rapid dome growth and ash plumes that affected Argentina, Falkland Islands (Islas Malvinas), and international aviation. The eruption attracted attention from institutions including the Servicio Nacional de Geología y Minería (SERNAGEOMIN), the United States Geological Survey, and the Universidad de Chile, while producing research collaborations with the Smithsonian Institution and the International Association of Volcanology and Chemistry of the Earth's Interior.
Chaitén is situated in the Los Lagos Region on the Chilean Pacific Ring of Fire where the Nazca Plate subducts beneath the South American Plate, a tectonic setting shared with Llaima, Villarrica, Calbuco, and Hudson (volcano), and near the Los Ríos Region and the Aysén Region. The volcano sits within a caldera overlain by a rhyolitic lava dome similar to domes at Mount St. Helens, Novarupta, and Krakatoa, and its behavior had been compared by researchers at the Universidad Austral de Chile with historic eruptions recorded by the Servicio Meteorológico Nacional (Argentina) and accounts in the expedition logs of Charles Darwin and Ferdinand Magellan.
Initial unrest was reported in 1999 with seismic swarms recorded by networks linked to SERNAGEOMIN and the Observatorio Volcanológico de los Andes del Sur (OVDAS), prompting alerts to local authorities in Palena Province and the Gobernación de Palena. The eruption produced an initial phreatomagmatic phase with ash columns that drifted toward Puerto Montt, Buenos Aires, and the South Atlantic, causing airspace notices issued by the International Civil Aviation Organization and aviation warnings from ICAO and the IATA that also referenced prior volcanic disruptions such as Eyjafjallajökull eruption and Mount Pinatubo eruption. Over days, activity evolved into effusive dome extrusion and intermittent pyroclastic flows comparable to sequences documented at Montserrat and Soufrière Hills.
The eruptive products were dominantly high-silica rhyolite with pumice, ash, and obsidian fragments similar petrologically to materials from Rhyolite Ridge and Inyo Craters, and analyses were undertaken by teams from the Geological Society of America and the American Geophysical Union. Dome growth rates resembled those observed at Mount Unzen and generated block-and-ash flows that descended drainage systems toward the Futaleufú River and coastal inlets frequented by vessels registered under the International Maritime Organization, prompting marine notices from the Chilean Navy (Armada de Chile). Geophysical monitoring documented gas emissions enriched in sulfur dioxide measured by instruments developed by the National Oceanic and Atmospheric Administration and collaborators at the European Space Agency using satellite data from missions such as Landsat and NOAA-AVHRR.
Ashfall and lahars damaged infrastructure in the town of Chaitén and communities along the Palena River, affecting schools run by the Ministerio de Educación (Chile) and health centers administered by the Ministerio de Salud (Chile), and prompting response from the Onemi civil protection agency and the Carabineros de Chile. Fisheries operating from Puerto Cisnes and tourism operators in the Alerce Andino National Park reported losses comparable to those after eruptions at Puyehue-Cordón Caulle and Choshuenco, while cattle ranches in Los Lagos Region and Chiloé Island experienced pasture contamination leading to economic claims involving regional offices of the Ministerio de Economía, Fomento y Turismo. Aviation disruptions affected airlines such as LAN Airlines and international carriers serving Comodoro Rivadavia and Ushuaia.
Local evacuations coordinated by the Municipality of Chaitén and provincial authorities used vessels from the Armada de Chile and aircraft chartered through operators with permits from the Dirección General de Aeronáutica Civil (DGAC), relocating residents to shelters in Puerto Montt, Quellón, and Coyhaique and registering evacuees with the Ministerio del Interior y Seguridad Pública (Chile). International assistance and scientific advisories were provided by the Red Cross and the Pan American Health Organization, while researchers from the Universidad de Concepción and the University of Oslo aided hazard assessments that referenced contingency frameworks from the United Nations Office for Disaster Risk Reduction.
Post-eruption studies involved petrology, geochemistry, and geochronology performed by teams affiliated with the Smithsonian Institution Global Volcanism Program, the Universidad de Chile, and the Instituto Geofísico del Perú using ^40Ar/^39Ar dating and electron microprobe analyses paralleling methods applied at Mount Mazama and Ritter Island. Long-term monitoring upgrades to seismic, geodetic, and gas networks were supported by grants from the National Science Foundation and collaborations with the European Research Council, deploying instruments comparable to those used at Kīlauea and Sakurajima. Results were published in journals associated with the American Geophysical Union and presented at meetings of the International Association of Volcanology and Chemistry of the Earth's Interior and the Geological Society of America.
The 1999 eruption paved the way for heightened vigilance preceding the 2008–2009 activity and influenced land-use decisions by the Servicio Agrícola y Ganadero (SAG) and regional planning by the Intendencia de Los Lagos; it also affected biodiversity in habitats managed by the Corporación Nacional Forestal (CONAF), including populations of Alerce (Fitzroya cupressoides). Economic recovery involved programs from the BancoEstado and regional development agencies coordinating reconstruction with the Ministerio de Vivienda y Urbanismo (MINVU), while legal and policy debates engaged members of the Chamber of Deputies of Chile and the Senate of Chile over resettlement and hazard zoning, influencing Chilean volcanic risk management ahead of later events at Calbuco and Chimborazo.
Category:Volcanic eruptions in Chile Category:1999 natural disasters Category:Chaitén