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| 2010 Pichilemu earthquake | |
|---|---|
| Name | 2010 Pichilemu earthquake |
| Timestamp | 2010-03-11 19:35:00 |
| Magnitude | 6.9 M_w |
| Depth | 15 km |
| Type | Megathrust |
| Affected | Pichilemu, O'Higgins Region, Chile |
| Intensity | VII (Very strong) |
| Casualties | 1 dead, dozens injured |
| Aftershocks | Thousands |
2010 Pichilemu earthquake was a significant seismic event that struck off the coast of Pichilemu in the O'Higgins Region of Chile on 11 March 2010. The shock occurred days after the 27 February 2010 2010 Chile earthquake and drew attention from institutions such as the United States Geological Survey, the Centro Sismológico Nacional (Chile), and the Geological Survey of Chile. The event produced strong shaking, localized structural damage in coastal towns, and triggered coordinated responses from agencies including the Onemi and the Chilean Navy.
The seismicity of central Chile is controlled by the convergent boundary between the Nazca Plate and the South American Plate, a setting responsible for historical events like the 1960 Valdivia earthquake and the 2010 Chile earthquake. The 2010 sequence included the momentous 8.8 M_w mainshock on 27 February and numerous large aftershocks cataloged by the International Seismological Centre and the Incorporated Research Institutions for Seismology. The coastal town of Pichilemu lies near the epicentral region influenced by the Peru–Chile Trench and several active faults mapped by the SERNAGEOMIN and the Servicio Hidrográfico y Oceanográfico de la Armada de Chile.
Seismographs at networks such as the Observatorio del Cerro Calán and international arrays recorded the shock as approximately 6.9 on the moment magnitude scale with a hypocenter depth reported near 15 km. The event was characterized as a shallow thrust mechanism on the plate interface similar to other megathrust earthquakes like the 1960 Valdivia earthquake and the 1877 Iquique earthquake. Strong-motion stations operated by the Dirección General de Aguas and academic groups from the Pontifical Catholic University of Chile and the University of Chile captured intense ground acceleration and long-period waves. Aftershocks were numerous and included several events measured by the European-Mediterranean Seismological Centre and the Pacific Tsunami Warning Center that prompted monitoring for tsunami threats by the Intergovernmental Oceanographic Commission and regional warning centers.
The quake produced intensity levels reaching VII (Very strong) on the Mercalli intensity scale in areas such as Pichilemu, Marchigüe, and sections of the Cardenal Caro Province. Damage included cracked masonry in heritage structures, collapse of adobe walls, and disruption to utilities monitored by companies like Empresa Nacional del Petróleo and regional branches of Chilectra. Coastal erosion and small landslides affected roads on the Ruta CH-90 and access to sites near Punta de Lobos, a well-known surf destination referenced by the World Surf League. Hospitals such as the Hospital San Antonio and clinics in Rancagua treated dozens of injured residents, while cultural landmarks tied to local figures and institutions experienced non-structural damage cataloged by staff from the Consejo de Monumentos Nacionales.
National emergency coordination was led by Onemi with support from the Chilean Army, the Chilean Air Force, and the Chilean Navy, which deployed vessels and aircraft for assessment. International actors including the United Nations Office for the Coordination of Humanitarian Affairs and non-governmental organizations such as the International Red Cross and Red Crescent Movement and Doctors Without Borders provided situational awareness and medical assistance. Local municipalities coordinated shelter in schools administered by the Ministry of Education (Chile) and community centers associated with the Servicio de Salud O'Higgins. Scientific teams from the Universidad de Concepción and the Centro de Investigación en Terremotos joined geotechnical surveys funded by agencies including the World Bank and the Inter-American Development Bank to evaluate infrastructure vulnerability.
Recovery involved reconstruction financed through programs of the Ministry of Housing and Urbanism (Chile) and social support from the Fondo de Solidaridad e Inversión Social. Seismic retrofitting guidelines by the Instituto de la Construcción and building code updates influenced projects in Pichilemu and neighboring communes. Academic analyses by researchers at the University of Santiago, Chile, the Massachusetts Institute of Technology, and the California Institute of Technology contributed to improved seismic hazard models and tsunami preparedness frameworks adopted by municipal authorities and regional planners. Commemorations and policy debates engaged lawmakers in the Chilean National Congress and civic organizations including local chapters of the Museo Nacional de Historia Natural (Chile). The event remains part of the broader 2010 Chile seismic sequence studied by seismologists from institutions such as the Smithsonian Institution and the Royal Society.
Category:2010 earthquakes in Chile Category:Earthquakes in O'Higgins Region Category:March 2010 events in South America