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| 1957 Guerrero earthquake | |
|---|---|
| Name | 1957 Guerrero earthquake |
| Date | 1957-03-28 |
| Time | 11:18 UTC |
| Magnitude | 7.6 Mw |
| Depth | 25 km |
| Location | Guerrero, Mexico |
| Countries affected | Mexico |
| Casualties | ~60–180 dead |
1957 Guerrero earthquake
The 1957 Guerrero earthquake struck the Pacific coast of Guerrero and adjacent regions of Mexico on 28 March 1957. The event produced widespread shaking across the Mexican states of Guerrero, Oaxaca, and Puebla, generated a local tsunami, and prompted seismic investigations by institutions such as the Instituto de Geofísica de la Universidad Nacional Autónoma de México and the United States Geological Survey. The earthquake occurred along the convergent margin where the Cocos Plate subducts beneath the North American Plate, a plate boundary that has produced historic events including the 1985 Mexico City earthquake and the 2017 Chiapas earthquake.
The earthquake occurred in the context of the active subduction zone off the southern Mexican coast at the interface between the Cocos Plate and the North American Plate. The Guerrero coast lies near the Guerrero segment of the Middle America Trench, an area characterized by seismic coupling, episodic slow slip events monitored by the Centro Nacional de Prevención de Desastres (CENAPRED), and historic earthquakes such as the 1911 Michoacán earthquake and the later 2014 Papanoa earthquake. Offshore geology includes accreted terranes studied by the Instituto de Geología (UNAM) and tectonic models refined by researchers associated with the Scripps Institution of Oceanography and the Seismological Society of America.
The mainshock was widely reported with a magnitude around Mw 7.6 and focal depths estimated near 20–30 km by analyses from the United States Geological Survey and the Servicio Sismológico Nacional (Mexico). Focal mechanism solutions indicate thrust faulting consistent with subduction interface rupture similar to mechanisms inferred for the 1787 Guerrero earthquake and the 1985 Michoacán earthquake rupture zones. Seismograms recorded at observatories such as the Observatorio Sismológico Nacional and international stations in California, Japan, and Chile provided data for moment tensor inversion studies published in journals like Bulletin of the Seismological Society of America and presented at meetings of the American Geophysical Union.
Strong shaking caused structural damage in coastal towns including Acapulco, Zihuatanejo, and smaller communities along the Costa Grande and Costa Chica. Reports compiled by the Secretaría de Marina (Mexico) and municipal authorities documented collapsed buildings, landslides on highways connecting Acapulco to Mexico City, and disruptions to rail lines operated historically by Ferrocarriles Nacionales de México. Casualty estimates vary among contemporary accounts from newspapers such as El Universal and reports to the International Red Cross, with fatalities reported in the dozens to low hundreds and numerous injuries. Damage to infrastructure affected ports, coastal warehouses, and service facilities overseen by the Comisión Federal de Electricidad and the Secretaría de Comunicaciones y Transportes.
The earthquake generated a local tsunami observed along parts of the Guerrero and Oaxaca coasts, with runup measurements recorded by coastal observers and later assessed by researchers at the Pacific Tsunami Warning Center and the International Tsunami Information Center. Secondary effects included submarine slope failures, coastal subsidence in localized areas recorded by geomorphologists from the Instituto Nacional de Antropología e Historia and salinization of agricultural lands reported by regional authorities. Aftershocks persisted for months and were catalogued by the Servicio Sismológico Nacional, contributing to ongoing local landslide hazards in steep mountainous zones mapped by the Universidad Autónoma Metropolitana.
Immediate response involved local civil protection efforts coordinated with federal agencies including the Secretaría de la Defensa Nacional and the Cruz Roja Mexicana. International offers of assistance and technical collaboration came from institutions such as the United States Geological Survey and the Inter-American Development Bank for reconstruction planning. Reconstruction efforts led to building inspections and revisions to construction practices promoted by the Instituto Mexicano del Seguro Social and municipal regulators in Acapulco. The event influenced disaster preparedness initiatives later incorporated into programs run by Protección Civil (Mexico) and informed emergency planning in subsequent earthquakes like the 1985 Mexico City earthquake and the 1995 Colima–Jalisco earthquake.
The 1957 Guerrero earthquake became a case study for plate interface rupture, tsunami generation, and regional seismic hazard assessment. Studies by researchers affiliated with Universidad Nacional Autónoma de México, the California Institute of Technology, and the Massachusetts Institute of Technology used the event to improve earthquake source models and to calibrate empirical ground motion relations employed by the Applied Technology Council. The event contributed to long-term catalogs maintained by the International Seismological Centre and informed seismic gap hypotheses for the Guerrero segment investigated by projects funded through agencies such as the National Science Foundation. Legacy outcomes include improved seismic monitoring networks, advances in tsunami modeling at the Pacific Marine Environmental Laboratory, and incorporation of lessons into urban planning in coastal Mexican cities like Acapulco and Zihuatanejo.
Category:Earthquakes in Mexico Category:1957 natural disasters Category:Guerrero