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| 2010 Chilean tsunami | |
|---|---|
| Name | 2010 Chile earthquake and tsunami |
| Caption | Damage in Concepción, Chile after the earthquake and tsunami |
| Magnitude | 8.8 Mw |
| Depth | 35 km |
| Countries affected | Chile, Peru, Bolivia, Argentina, Japan, French Polynesia |
| Casualties | ~525 dead, thousands injured, missing |
| Date | 27 February 2010 |
| Time | 03:34 CLST |
2010 Chilean tsunami
The 27 February 2010 event began with a megathrust earthquake off the coast of Maule Region near Concepción, Chile, producing a transoceanic tsunami that affected coastal communities across the Pacific Ocean and prompted international scientific, humanitarian, and policy responses involving institutions such as the United Nations and International Red Cross and Red Crescent Movement. The disaster influenced seismic hazard assessment efforts at organizations including the United States Geological Survey, Centro Sismológico Nacional (Chile), and research groups at Massachusetts Institute of Technology, University of Chile, and Scripps Institution of Oceanography.
The earthquake occurred along the convergent margin where the Nazca Plate subducts beneath the South American Plate at the Peru–Chile Trench, a setting responsible for historical events like the 1960 Valdivia earthquake and the 1877 Iquique earthquake. Regional tectonics involving the Andes mountain building, the Atacama Fault System, and the long-term seismic cycle documented by the International Seismological Centre explain strain accumulation that affected provinces including Maule Region, Bío Bío Region, and Valparaíso Region. Paleoseismology studies referencing sites such as Concepción Cathedral and stratigraphic records in Coquimbo informed background recurrence estimates used by agencies like the Comisión Nacional de Investigación Científica y Tecnológica.
The mainshock, recorded as 8.8 on the moment magnitude scale, exhibited shallow thrust faulting on the plate interface similar to mechanisms analyzed after the 2004 Indian Ocean earthquake and tsunami and the 1964 Alaska earthquake. Rupture propagated along a rupture zone extending from near Canela to south of Concepción, producing significant coseismic uplift and subsidence observed at tide gauges in Valparaíso, Talcahuano, and Pichilemu. Seismologists at the Geophysical Institute of Peru, National Oceanic and Atmospheric Administration, and the European-Mediterranean Seismological Centre used waveform modeling, GPS displacements recorded by Red Geodésica de Chile, and tsunami generation models developed at NOAA Pacific Marine Environmental Laboratory to reconstruct source parameters and initial tsunami amplitudes.
Tsunami waves radiated across the Pacific Ocean basin, triggering alerts from the Pacific Tsunami Warning Center, Japan Meteorological Agency, and regional civil defense authorities such as Chile's Oficina Nacional de Emergencia (ONEMI)]. Coastal impacts were severe in Chilean localities including Dichato, Constitución, Concepción, Talcahuano, and Pichilemu; transoceanic effects were recorded in Hilo, Hawaii, Honolulu, Tahiti, Japan, and islands of New Zealand and Australia with harbor oscillations recorded by tide gauges at San Diego and Valparaíso. Shipborne and harbor damage involved ports like Valparaíso and Talara, while inundation maps produced by teams from Japan Agency for Marine-Earth Science and Technology, University of Hawaiʻi, and CSIC documented run-up variations influenced by bathymetry near the Juan Fernández Islands.
Human toll estimates combined fatalities from the earthquake and the tsunami, with official counts reporting several hundred dead and many missing; affected populations included residents of urban centers such as Santiago, Chile and smaller fishing communities like Llico and Ranquil. Casualties resulted from building collapse, coastal inundation, secondary hazards such as landslides in the Bío Bío Region, and disruptions to essential services managed by utilities including Empresa Nacional de Electricidad and Empresa de los Ferrocarriles del Estado. International organizations like Médecins Sans Frontières and World Food Programme participated in relief efforts responding to displacement and public health impacts.
Chile's national response involved coordination between ONEMI, the Chilean Navy, and municipal authorities in Concepción and Maule Region, with military deployment for search and rescue and enforcement of curfews. International assistance came from countries including United States, Japan, Argentina, Brazil, and organizations such as the International Federation of Red Cross and Red Crescent Societies and the United Nations Office for the Coordination of Humanitarian Affairs. Reconstruction programs engaged Chilean ministries and international development banks like the Inter-American Development Bank and World Bank to finance housing, port repairs in Talcahuano, and restoration of infrastructure on routes like Ruta 5.
Physical damage included collapsed buildings in Concepción, destroyed piers in Talcahuano, and extensive losses to fisheries and aquaculture industries near Cholguán and Coliumo. Critical infrastructure impacts involved airport disruptions at Carriel Sur International Airport, rail interruptions affecting Santiago Metro freight links, and damage to road networks in Maule Region. Economic assessments by the Central Bank of Chile and international analysts from International Monetary Fund estimated sizable GDP impacts concentrated in agriculture, forestry, fishing, mining supply chains linked to companies operating in regions such as Biobío and Maule, and long-term reconstruction costs managed through public-private partnerships involving firms like Codelco.
Post-event investigations published by researchers affiliated with Universidad de Chile, Seismological Society of America, Nature (journal), and Science (journal) analyzed rupture dynamics, tsunami early warning performance, and coastal vulnerability. Studies comparing this event with the 2004 Indian Ocean earthquake and tsunami informed improvements to the Pacific Tsunami Warning Center protocols, coastal land-use planning in municipalities like Constitución and Dichato, and development of community-based evacuation maps used by organizations including UNESCO's Intergovernmental Oceanographic Commission. Lessons emphasized integrating GPS, tide-gauge networks, and real-time seismic arrays such as those coordinated by the Global Seismographic Network to enhance rapid source characterization and evacuation procedures for future subduction-zone events.
Category:Earthquakes in Chile Category:2010 natural disasters