1944 San Juan earthquake

Earthquake in Argentina 1944 San Juan earthquake Terremoto San Juan 004.jpg Damage in San Juan following the earthquake Argentina 1944-01-15 23:49:32 899270 iscgem899270 1944 01 15 20:49 7.0 w yAlvarado P. Beck S. Susan L. Beck 2006 Source characterization of the San Juan (Argentina) crustal earthquakes of 15 January 1944 (Mw 7.0) and 11 June 1952 (Mw 6.8) Earth and Planetary Science Letters 243 3–4 615–631 10.1016/j.epsl.2006.01.015 2006E&PSL.243..615A -31.372 -68.436 region:XX_type:event inline,title La Laya fault reverse Argentina, San Juan 9 10,000 killed thumb|240px|Wreckage in downtown San Juan in the wake of the 1944 quake The 1944 San Juan earthquake took place on 15 January in the province of San Juan, in the center-west area of Argentina, a region highly prone to seismic events. This moderate to strong earthquake (estimated moment magnitudes range from 6.7 to 7.8) destroyed a large part of San Juan, the provincial capital, and killed 10,000 of its inhabitants, 10 percent of its population at the time.Listado de terremotos históricos https://web.archive.org/web/20110929075554/http://www.inpres.gov.ar/seismology/seismology/historic/hist.panel.htm September 29, 2011 esJune 2026 One third of the province population became homeless. It is acknowledged as the worst natural disaster in Argentine history. The earthquake occurred at 8:49 pm on 15 January 1944 and had its epicenter 30 km north of the provincial capital, near La Laja in Albardón Department. Some 90% of the buildings in the city were destroyed and those left standing suffered such damage that in most cases they had to be demolished. It is considered that the reason for such widespread destruction was the low quality of construction, rather than just the power of the earthquake. In 1944, many of San Juan's houses were made of adobe and the reconstruction programme prompted the creation of a building code that took into account contemporary knowledge of earthquakes and their effect on buildings. Stronger bricks were used, concrete single-story houses were erected, and sidewalks and streets were made wider. Geology The 15 January 1944 shock represented rupture of a fault within the crust of the South American plate. Several other large earthquakes have occurred in the San Juan region in 1894, 1952 and 1977 at depths no greater than 35 km. The mainshock generated a 6–8 km fault scarp along the La Laja Fault in the Precordillera region. This region displays thin-skinned deformation as a result of the fold and thrust belt beneath the area. It is not fully understood if the La Laja Fault, a reverse fault, was the dominant or secondary structure that ruptured during the earthquake. The La Laja Fault is part of a larger thrust system in the Precordillera. The earthquake's focal mechanism suggests rupture occurred along a north–south striking, east-dipping fault corresponding to the La Laja Fault. In San Juan, the maximum Modified Mercalli intensity was IX (Violent), as was in Albardón.Alvarado Patricia Beck Susan Source characterization of the San Juan (Argentina) crustal earthquakes of 15 January 1944 (Mw 7.0) and 11 June 1952 (Mw 6.8) Earth and Planetary Science Letters 2006 243 3-4 615–631 10.1016/j.epsl.2006.01.015 https://www.geo.arizona.edu/sites/www.geo.arizona.edu/files/web/Beck/pubs/AlvaradoBeckEPSL2006.pdf 21 September 2024 9 June 2024 https://web.archive.org/web/20240921172254/https://www.geo.arizona.edu/sites/www.geo.arizona.edu/files/web/Beck/pubs/AlvaradoBeckEPSL2006.pdf dead Aid and reconstruction thumb|240px|The injured are tended to following the collapse of the city hospital There was some debate as to whether it would be advisable to rebuild the city in the same place, or to take advantage of the situation to move it to a less earthquake prone location. The former alternative was adopted. At the start of the reconstruction, emergency homes were built for the population with funds from the national state. This was the first large-scale state-directed construction plan in Argentina, the first stages of which occurred under Peronist rule. Colonel Juan Perón, later to become president, had met his future wife Eva Duarte, during fundraising activities to help the victims. After the 1955 coup d'état ousted Perón, the reconstruction was continued under the de facto President Pedro Eugenio Aramburu. The earthquake caused many families to scatter in the confusion, and left around 1,000 orphaned children. According to historian Mark Healey, the issues surrounding the orphans and the nearly 100,000 homeless had a profound influence on the shaping of social legislation enacted during Perón's first term as president, two years later.Healey, pp. 52–53Healey, Página 12 interview, August 7, 2006 The modern city As of 2006, San Juan has a population of around 400,000, and 63% of its approximately 90,000 homes, and 100% of its public institutional buildings, were built under seismic safety regulations. This, however, leaves almost a third of houses as non-seismic-resistant. A study of the seismic vulnerability of the city, conducted by the National University of San Juan in 2005, showed that 28% of the outlying neighborhoods present medium risk, and 20% of the city itself can be classified as high or very high vulnerability. See also List of earthquakes in 1944 List of earthquakes in Argentina Notes References Mark Healey Fall 2002 http://history.berkeley.edu/faculty/Healey/fragility.pdf The Fragility of the Moment: Politics and Class in the Aftermath of the 1944 Argentine Earthquake International Labor and Working-Class History 62 50–59 https://web.archive.org/web/20051121104239/http://history.berkeley.edu/faculty/Healey/fragility.pdf 21 November 2005 es Historia del país. El terremoto de San Juan https://web.archive.org/web/20040203205533/http://www.historiadelpais.com.ar/terremoto.htm 2004-02-03 . es Universia Argentina. San Juan: identifican la vulnerabilidad sísmica. es EIRD. Prevención Sísmica y Desarrollo Urbano. es Diario de Cuyo. 15 January 2004. Aniversario del Terremoto del 44. es Página/12. 7 August 2006. "Hubo un borramiento del pasado" (interview with historian Mark Healey). 899270 Category:Earthquakes in San Juan Province, Argentina 1944 San Juan, 1944 Category:History of Argentina (1943–1955) San Juan Category:January 1944 in South America