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| 27 February 2010 Chile earthquake and tsunami | |
|---|---|
| Name | 2010 Chile earthquake |
| Native name | Terremoto de Chile de 2010 |
| Date | 27 February 2010 |
| Magnitude | 8.8 M_w |
| Depth | 35 km |
| Countries affected | Chile, Peru, Bolivia, Argentina |
| Casualties | ~525 dead, thousands injured |
27 February 2010 Chile earthquake and tsunami The 27 February 2010 seismic event off the coast of central Chile produced a moment magnitude of 8.8 and triggered a trans-Pacific tsunami that affected coastlines from Chile to Japan. The earthquake occurred along the convergent plate boundary of the Nazca Plate and the South American Plate, generating widespread damage across regions such as Maule and Bío Bío, and prompting international responses from organizations like the United Nations Office for the Coordination of Humanitarian Affairs, the International Federation of Red Cross and Red Crescent Societies, and national agencies including ONEMI.
The earthquake occurred along the Peru–Chile Trench where the Nazca Plate subducts beneath the South American Plate, a setting also responsible for historical events such as the 1960 Valdivia earthquake and the 1877 Iquique earthquake. Subduction zone coupling in central Chile has been studied by institutions including the United States Geological Survey, the Servicio Sismológico de la Universidad de Chile, and the Instituto Geofísico del Perú. Regional seismicity around the Maule Region, Biobío Region, and Santiago Metropolitan Region reflects megathrust processes documented by researchers from MIT, Caltech, ETH Zurich, and the University of Chile. Paleoseismology records and tsunami deposits linked to events like the 1751 earthquake informed hazard models used by the Pacific Tsunami Warning Center and the Intergovernmental Oceanographic Commission.
At 03:34 local time on 27 February 2010 the rupture initiated near the coast of central Chile, with focal mechanisms determined by observatories such as the USGS and the Global Centroid Moment Tensor Project. Rupture propagated over several hundred kilometers affecting urban centers including Concepción, Chile, Talca, Chillán, and Santiago, Chile. Seismologists from IRIS (organization), GFZ German Research Centre for Geosciences, and the National Seismological Center of Mexico analyzed broadband waveforms and GPS displacements recorded by networks like RENADIC and GEONET. The seismic sequence produced strong ground motions exceeding design levels at sites including the Compañía de Jesús (Chile) heritage structures and modern facilities such as the Alto Río building.
The megathrust slip produced seafloor displacement that generated tsunami waves observed by tide gauges at Valparaíso, Callao, Hilo, Hawaii, and Honshu, Japan. Numerical modeling efforts by groups at the NOAA Pacific Marine Environmental Laboratory, the University of Tokyo, and the Scripps Institution of Oceanography simulated wave propagation across the Pacific Ocean basin and compared results to observations from the Deep-ocean Assessment and Reporting of Tsunamis network and coastal stations managed by the Japan Meteorological Agency. Local tsunami impacts were exacerbated by bathymetric focusing near the Itata River mouth and estuaries adjacent to ports such as Talcahuano and Penco.
Casualties and displacement affected populations across administrative divisions including Maule Region, Bío Bío Region, Ñuble Region, and O'Higgins Region. Hospitals such as the Hospital Regional de Concepción and the Hospital Clínico Universidad de Chile received injured patients while international medical teams from Médecins Sans Frontières, the Red Cross societies, and military medical units from Argentina and Peru assisted. Critical infrastructure failures contributed to fatalities in towns like Dichato and Constitución. Economic sectors including mining operations of CODELCO, Barrick Gold, and agriculture exporters in ports such as San Antonio, Chile experienced disruptions.
Structural damage affected transportation assets like the Biotren commuter system, the Aníbal Pinto Avenue corridor, and the Pan-American Highway segments, impeding logistics for responders including units from the Chilean Navy and the Carabineros de Chile. Coastal ports including Talcahuano and Coronel saw quay and pier damage affecting vessels operated by companies such as CSAV and Empresas Copec. Energy and utility systems encountered outages at facilities operated by Enersis and Endesa Chile, while telecommunications networks including providers like Entel and satellite ground stations experienced interruptions. Cultural heritage sites such as the Cathedral of Concepción sustained significant damage prompting assessments by the National Monuments Council (Chile).
National response was coordinated by agencies including ONEMI, the Chilean Air Force, and the Navy of Chile, with international assistance from partners like the United States Agency for International Development, the European Union Civil Protection Mechanism, and search-and-rescue teams from Japan and Mexico. Humanitarian relief deployed by organizations such as the International Committee of the Red Cross and World Food Programme focused on shelter, water, and medical care in temporary sites managed in collaboration with municipal authorities of Concepción and Talca. Reconstruction initiatives involved engineers and planners from World Bank, Inter-American Development Bank, and local universities including the Pontifical Catholic University of Chile.
The mainshock was followed by numerous aftershocks, including events above magnitude 6 recorded by observatories like the Santiago Metropolitan Observatory and international networks operated by IRIS and the Incorporated Research Institutions for Seismology. Seismic monitoring upgrades accelerated collaborations among institutions such as the University of Chile, GFZ, and USGS to enhance early warning through systems like the Pacific Tsunami Warning Center and regional tsunami advisories issued by the Japan Meteorological Agency. Research on stress transfer and Coulomb failure models involved teams at European Seismological Commission conferences and resulted in improved hazard maps used by municipal planners in affected cities.
Category:Earthquakes in Chile Category:2010 disasters in Chile