1970 Colombia earthquake

none Colombia 1970-07-31 17:08:05 794176 iscgem794176 1970 07 31 12:08:05 8.0 w y 645 km mi 0 on -1.6 -72.53 region:CO_type:event inline,title Colombia IV 1 dead, several injured The 1970 Colombia earthquake occurred in Colombia on July 31. Details and aftermath The shock killed one person and injured several others. Because it was a deep-focus earthquake, shaking occurred over an extensive area, including San Juan, Bogotá, Caracas, Buenos Aires, and São Paulo; it was felt as far north as Mexico City. Its depth forestalled more serious casualties,https://earthquake.usgs.gov/earthquakes/world/events/1970_07_31.php Historic Earthquakes: Colombia 1970 United States Geological Survey November 1, 2012 July 30, 2013 and there were no aftershocks.The Dynamic Structure of the Deep Earth: An Interdisciplinary Approach Karato, Shun'ichiro Princeton University Press 2003 978-0691095110 162 The depth of the earthquake prompted scientists in South America to install seismometer networks focused on long-period earthquakes. Until the 1994 Bolivia earthquake, the 1970 Colombia earthquake was famous among seismologists as the largest deep earthquake.Russakoff, Ekstrom, and Tromp, pg. 20423. Analysis A study completed by Dziewonski and Gilbert (1974) determined that the earthquake had featured isotropic compression, or an increase in density near the rupture point similar to an implosion;An Implosive Precursor to the Colombia Earthquake 1970 July 31 Kennett, L.N. Simons, R.S. 1976 44 2 471 Geophysical Journal International 1976GeoJI..44..471K 10.1111/j.1365-246X.1976.tb03668.x free this was released to great controversy. They also claimed that the compression had been initiated 80 seconds before the actual earthquake's short-period shaking. Many studies have reached differing conclusions including a dearth of isotropic movement, and many scientists feel that resolution created errors in Dziewonski and Gilbert's findings.Russakoff, Ekstrom, and Tromp, pg. 20424. In 1997, Russakoff, Ekstrom, and Tromp reassessed their findings utilizing more advanced equipment that factored in shear wave splitting and coupling (the measure of how tightly locked two sides of a fault or plate are) and confirmed that there was very little isotropic compression. See also List of earthquakes in 1970 List of earthquakes in Colombia References http://iisee.kenken.go.jp/utsu/utsuweq_bak_eng.html IISEE Catalogue Search parameters page IISEE Catalog of Damaging Earthquakes in the World August 18, 2013 September 18, 2013 https://web.archive.org/web/20130918042738/http://iisee.kenken.go.jp/utsu/utsuweq_bak_eng.html dead ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009) http://www.isc.ac.uk/iscgem/index.php ISC 2015 International Seismological Centre Version 2.0 Bibliography A new analysis of the great 1970 Colombia earthquake and its isotropic component Russakoff, Daniel Ekström, Göran Tromp, Jeroen amp Journal of Geophysical Research 102 B9 September 10, 1997 20, 423–20, 434 10.1029/97jb01645 1997JGR...10220423R free External links 794176 expanded Category:1970 earthquakes Category:1970 in science Category:1970 in Colombia 1970 Category:July 1970 in South America