1953 Tumbes earthquake

Earthquake affecting Peru and Ecuador 1953 Tumbes earthquake 1953-12-12 17:31:29 892281 iscgem892281 1953 12 12 12:31:29 Peru 7.5 w y 30 km 3.4 S 80.6 W Peru 8 6–7 dead 20 injured 1953 Tumbes earthquake.jpg The 1953 Tumbes earthquake occurred on December 12 at 12:31:29 local time 17:31:29 UTC near the border between Peru and Ecuador. The shock had a moment magnitude of 7.5, a maximum Mercalli Intensity of VIII (Severe), and occurred in the northwestern offshore area of Tumbes, Peru. Geology The North Andean convergent margin is a region of large crustal deformation. The North Andes block moves northeastwards relative to the South America at a rate of 6±2 mm/yr. The Nazca plate is subducting beneath the South American plate along the Colombia-Ecuador Trench. The subduction of the Carnegie Ridge into the Colombia-Ecuador Trench affected the crustal deformation in this region and the coupling between the Nazca plate and the South America Plate. In addition, the subduction of the Carnegie Ridge may be an important drive contributing to the relatively northeastward movement of the North Andes block. Although there was no large earthquakes in the Gulf of Guayaquil segment of the subduction zone in the late 20th century, the strong earthquakes in 1953 and 1959 suggested that this was because of the strong coupling rather than being aseismic, and the seismic coupling may be quite high and be able to produce large earthquakes."Tectonic segmentation of the North Andean margin: impact of the Carnegie Ridge collision" by M. -A. Gutscher, J. Malavieille, S. Lallemand, and J. -Y. CollotPleistocene to Present North Andean "escape" Tectonophysics 489 1 248–257 2010 Egbue Obi Kellogg James 2010Tectp.489..248E 10.1016/j.tecto.2010.04.021 Besides subduction, other activities also played important roles in this region. A strike-slip fault known as the Dolores-Guayaquil megashear runs from the trench and goes inland. The Gulf of Guayaquil formed as a result of movement on the Dolores-Guayaquil megashear.AAPG Bulletin November 2005 11 89 15191545 http://geoscience.unlv.edu/Fildani_et_al.PDF Geochemical characteristics of oil and source rocks and implications for petroleum systems, Talara basin, northwest Peru Fildani Andrea Hanson Andrew D. Chen Zhengzheng Moldowan J. Michael Graham Stephan A. Arriola Pedro Raul 10.1306/06300504094 2005BAAPG..89.1519F 2012-05-25 https://web.archive.org/web/20120710024359/http://geoscience.unlv.edu/Fildani_et_al.PDF 2012-07-10 dead Damage The earthquake caused six deaths. About 200 buildings were destroyed in Tumbes, Peru.United States Earthquakes, 1953 https://pubs.usgs.gov/of/1984/0953/report.pdf L.M. Murphy W.K. Cloud Open-File report 84-953 United States Geological Survey 29, 42Significant Earthquake Database https://www.ngdc.noaa.gov/nndc/struts/form?t=101650&s=1&d=1 https://web.archive.org/web/20060929000601/http://www.ngdc.noaa.gov/nndc/struts/form?t=101650&s=1&d=1 dead September 29, 2006 National Geophysical Data Center / World Data Service (NGDC/WDS) National Geophysical Data Center, NOAA 10.7289/V5TD9V7K 1972 Data Set Strong shaking could be felt in northeastern Peru and part of Ecuador. The intensity reached MM VIII in Corrales, Tumbes. In Guayaquil, Ecuador, the intensity was MM VI–VII. There were ground fissures in moist soils. Ejection of mud was reported in Bocapan and Puerto Pizzaro.Análisis de la Vulnerabilidad Sísmica en Hospitales del Perú – 9.- Anexos http://bvpad.indeci.gob.pe/doc/pdf/esp/doc586/doc586_4a.pdf bvpad.indeci.gob.pe Tsunami A tsunami of ~0.2m was triggered near Salinas."Tsunami mapping in the Gulf of Guayaquil, Ecuador, due to local seismicity" by M. Ioualalen, T. Monfret, N. Béthoux, M. Chlieh, G. Ponce Adams, J.-Y. Collot, C. Martillo Bustamante, K. Chunga, E. Navarrete, G. Montenegro, and G. Solis Gordillo Risk assessment Guayaquil, the most populated city of Ecuador, is close to significant seismogenetic structures. The commercial center of Guayaquil is established on alluvial clay deposits interbedded with silty and clayey sand sediments, and the southwestern and southern part of Guayaquil directly lies on lands reclaimed from marshland. Large historical earthquakes, including the earthquake of 1953, showed the importance of the assessment of ground effects caused by earthquakes in Guayaquil. A new INQUA Intensity Scale has been proposed to be applied in such assessment."Seismic Hazard Assessment for Guayaquil City (Ecuador): Insights from Quaternary Geological Data" by K. Chunga, C. León, M. Quiñónez, S. Benítez, and G. Montenegro See also List of earthquakes in 1953 List of earthquakes in Peru References Distribución de máximus intensidades sísmicas observadas en el Perǘ http://www.cismid.uni.edu.pe/descargas/redacis/redacis17_a.pdf J. E. Alva Hurtado J. M. Loja V. G. León 1984 V Congreso Nacional de Ingeniería Civil, Tacna, 12–18 Noviembre de 1984 2012-04-02 https://web.archive.org/web/20101009053216/http://www.cismid.uni.edu.pe/descargas/redacis/redacis17_a.pdf 2010-10-09 dead PAGER-CAT Earthquake Catalog https://earthquake.usgs.gov/static/lfs/data/pager/catalogs/ September 4, 2009 United States Geological Survey Version 2008_06.1 External links 892281 Tumbes earthquake, 1953 Category:1953 in Peru Category:1953 in Ecuador Category:1950s tsunamis Category:Earthquakes in Peru Category:Earthquakes in Ecuador Category:Tsunamis in Ecuador Category:Tsunamis in Peru Category:1953 disasters in Peru Category:1953 disasters in Ecuador