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| 2015 Calbuco eruption | |
|---|---|
| Name | Calbuco |
| Photo caption | Calbuco seen from Llanquihue Lake |
| Elevation m | 2003 |
| Location | Los Lagos Region, Chile |
| Type | Stratovolcano |
| Last eruption | 2015 |
2015 Calbuco eruption
The 2015 Calbuco eruption was a major explosive event at the stratovolcano Calbuco in the Los Lagos Region of Chile that produced powerful Plinian and sub-Plinian plumes, widespread ashfall, and large pyroclastic density currents. The eruption began on 22 April 2015 after a period of increased seismicity and led to extensive evacuations, disruption of transportation across Chile, Argentina, and the South Pacific, and international scientific attention from institutions such as the Servicio Nacional de Geología y Minería, the United States Geological Survey, and the International Civil Aviation Organization.
Calbuco is a stratovolcano situated near Puerto Montt, between Llanquihue Lake and Reloncaví Estuary, in a region shaped by the Andes and the subduction of the Nazca Plate beneath the South American Plate. The volcano lies within the Southern Volcanic Zone of the Andes Volcanic Belt, sharing tectonic and magmatic affinities with nearby centers such as Osorno Volcano, Puyehue-Cordón Caulle, and Chaitén. Calbuco's eruptive history includes notable events in 1893 and 1961; the 1961 eruption produced pyroclastic flows and lahars that affected Río Negro basin communities. Monitoring prior to 2015 involved networks operated by the Servicio Nacional de Geología y Minería (SERNAGEOMIN), regional observatories in Puerto Varas, and seismic arrays supported by international partners including the GFZ German Research Centre for Geosciences and Observatoire Volcanologique et Sismologique de Guadeloupe collaborators.
Precursor activity in April 2015 included swarms of volcano-tectonic earthquakes recorded by SERNAGEOMIN and increased fumarolic emissions detected by regional agencies and media outlets from Puerto Montt and Puerto Varas. On 22 April 2015 a sudden, violent eruption produced an initial column reaching stratospheric altitudes and prompted immediate alerts from the Dirección General de Aeronáutica Civil and the International Civil Aviation Organization. A second major eruptive pulse occurred within 24–36 hours, extending ash dispersal into Argentina and over the Falkland Islands. Over the following days intermittent ash emissions continued, with plume heights and pyroclastic activity diminishing by late April as seismicity subsided and remote sensing by MODIS and Sentinel-2 documented deposit cooling.
Eruptive behavior combined Plinian columns, pyroclastic density currents, ballistic ejecta, and extensive tephra fall. The eruption produced juvenile and lithic fragments with compositions ranging toward andesitic to dacitic magmas similar to earlier Calbuco products and neighboring vents like Puyehue-Cordón Caulle and Futaleufú volcanic field. Ash plume dynamics were influenced by regional wind fields tied to the Roaring Forties and the Southern Westerlies, carrying fine ash across the Patagonian Andes and into the South Atlantic Ocean. Volcanic gases released included sulfur dioxide, monitored by satellites such as OMI and ground-based spectrometers used by teams from SERNAGEOMIN and the University of Chile.
Immediate impacts included ashfall that blanketed urban and rural areas including Puerto Montt, Puerto Varas, Osorno, and towns in Llanquihue Province, disrupting water supplies and public services. Authorities evacuated tens of thousands of residents from communities surrounding Calbuco and established shelters with support from the Red Cross chapter of Chile and the Onemi national emergency office. Airspace closures affected flights by carriers such as LATAM Airlines and Sky Airline, while cross-border impacts prompted advisories in Neuquén Province and Río Negro Province of Argentina. Livestock and agriculture suffered ash contamination issues, and road and rail links—critical for industries including Salmon farming and regional tourism centered on Vicente Pérez Rosales National Park—were temporarily disrupted.
The eruption injected ash and aerosols into the troposphere and lower stratosphere, altering radiative properties regionally and producing vivid sunsets observed from distant locations including Buenos Aires and Montevideo. Sulfur dioxide plumes detected by satellite influenced local air quality indices in urban centers such as Puerto Montt and contributed to short-term respirable particulate hazards monitored by public health agencies and the World Health Organization guidance frameworks. Ash deposition affected freshwater systems like Reloncaví Estuary and Llanquihue Lake, with ecological consequences for native fish and aquaculture operations linked to companies operating in the Los Lagos Region. Long-term climatic impacts were limited compared with large stratospheric eruptions like Mount Pinatubo.
National and regional authorities, including Onemi and the Intendencia de Los Lagos, coordinated evacuations, sheltering, and recovery logistics with support from the Chilean Army's engineering units and civil organizations such as the Cruz Roja Chilena. Clean-up operations addressed roof loading and ash removal, with municipal services deploying heavy equipment to clear roadways in towns like Puerto Varas and Frutillar. Financial and reconstruction assistance involved the Ministerio del Interior y Seguridad Pública and sectoral ministries addressing agriculture and fisheries losses, while international humanitarian agencies provided technical support for health and sanitation in temporary shelters.
The 2015 eruption stimulated multidisciplinary research by institutions including SERNAGEOMIN, the University of Chile, Universidad Austral de Chile, and international partners such as the USGS and Imperial College London. Studies analyzed seismological precursors, petrology of erupted material, remote sensing of ash and SO2 plumes via MODIS, OMI, and Sentinel-2, and ground deformation using InSAR techniques from European Space Agency missions. The event advanced understanding of eruption precursory signals in the Southern Volcanic Zone and led to enhancements in real-time monitoring networks, community-based early warning protocols implemented in Los Lagos Region municipalities, and revised aviation hazard maps coordinated through the International Civil Aviation Organization and regional Volcanic Ash Advisory Centers.
Category:Volcanic eruptions in Chile Category:2015 natural disasters