1981 Playa Azul earthquake

1981 Playa Azul earthquake 1981-10-25 03:22:15 usp0001gnv 610441 October 24, 1981 21:22 Mexico 7.2 w y 7.3 s y 33 km 18.05 N 102.08 W Mexico 8 3–9 killed, 28 injured 1981 Playa Azul earthquake.jpg USGS United States Geological Survey ShakeMap The 1981 Playa Azul earthquake occurred on October 24, 1981, at 21:22 local time (03:22 UTC on October 25). It was located near Playa Azul, Michoacán, Mexico. The magnitude of the earthquake was w y 7.2, or s y 7.3.Engdahl E.R. Villaseñor A. International Handbook of Earthquake Engineering Seismology, Part A Lee W.H.K. Kanamori H. Jennings P. Kissinger K. International Association of Seismology and Physics of Earth's Interiors 2002 81A 684 Global seismicity: 1900–1999 https://earthquake.usgs.gov/data/centennial/centennial.pdf Three deaths were reported, two from Michoacán and one from Mexico City. Some buildings were damaged in both Michoacán and Mexico City. A small tsunami was registered in Acapulco with a maximum height of 9 cm.ftp://ftp.cicese.mx/pub/divOC/ocefisica/vientos/Tsunami_Links/Catalogo.pdf Catalog of Tsunamis on the Western Coast of Mexico Sanchez Devora A.J. Farreras Sanz S.F. 1993 36 SE-50 dead 11 August 2012 Tectonic setting The southwestern coast of Mexico lies above the convergent boundary where the Rivera plate and Cocos plate are being subducted beneath the North American plate along the Middle America Trench. The area is seismically very active with large thrust type earthquakes occurring along the plate interface and normal fault type earthquakes occurring at a somewhat deeper level within the descending slab. The plate interface seismicity in this area is strongly segmented, with separate Jalisco, Michoacán, Guerrero and Colima segments being recognised.Pardo M. Suárez G. 1995 Shape of the subducted Rivera and Cocos plates in southern Mexico: Seismic and tectonic implications Journal of Geophysical Research 100 B7 12357–12373 http://www.geo.mtu.edu/EHaz/ConvergentPlatesClass/week%204/PardoSuarez95JB00919.pdf 11 August 2012 10.1029/95jb00919 1995JGR...10012357P The southeastern end of the Michoacan segment coincides with the broad Orozco fracture zone within the Cocos plate.Ramírez-Herrera M.T. Kostoglodov V. Urrutia-Fucugauchi J. amp 2011 Overview of Recent Coastal Tectonic Deformation in the Mexican Subduction Zone Pure and Applied Geophysics 168 8–9 1415–1433 http://usuarios.geofisica.unam.mx/vladimir/papers_pdf/Ramirez_etal_PAGEOPH_2011.pdf 11 August 2012 10.1007/s00024-010-0205-y 2011PApGe.168.1415R 73715203 During the 1970s, with no major earthquakes recorded since at least 1911, the segment was recognised as a major seismic gap. Earthquake This earthquake was an interplate earthquake that occurred in the central part of the Michoacán seismic gap.http://bibliotecadigital.ilce.edu.mx/sites/ciencia/volumen1/ciencia2/34/html/sec_12.html Terremotos: Predicción Nava A. La Ciencia para todos Spanish 11 August 2012 The 1985 Michoacán earthquake broke the two remaining parts of the Michoacán gap, i.e. those to the north and south of the 1981 Playa Azul earthquake rupture zone.Eissler H. Astiz L. Kanamori H. amp 1986 Tectonic setting and source parameters of the September 19, 1985 Michoacan, Mexican Earthquake Geophysical Research Letters 13 6 569–572 http://www.gps.caltech.edu/uploads/File/People/kanamori/HKgrl86.pdf 11 August 2012 10.1029/gl013i006p00569 1986GeoRL..13..569E https://web.archive.org/web/20100723150123/http://www.gps.caltech.edu/uploads/File/People/kanamori/HKgrl86.pdf 2010-07-23 dead The 1981 Playa Azul earthquake had a focal mechanism of reverse faulting from a shallow-dipping thrust fault.Havskov J. Singh S.K. Nava E. Dominguez T. Rodriguez M. amp 1983 Playa Azul, Michoacán, Mexico, earthquake of 25 October 1981 (Ms = 7.3) Bulletin of the Seismological Society of America 73 2 449–457 http://bssa.geoscienceworld.org/content/73/2/449.short 11 August 2012 The maximum slip of this earthquake was estimated to be about 4.04 m.http://www.geociencias.unam.mx/~cmendoza/FINAL_PAGINA_WEB_20_06_2012/25-10-1981/SLIP_PLAYA_AZUL.html Playa Azul Slip Lopez M.R.M. Centro de Geociencias Spanish 11 August 2012 https://web.archive.org/web/20131215001736/http://www.geociencias.unam.mx/~cmendoza/FINAL_PAGINA_WEB_20_06_2012/25-10-1981/SLIP_PLAYA_AZUL.html 15 December 2013 dead According to the calculation of C. Mendoza, along the dipping interface the area of maximum slip was concentrated below the hypocenter, and there was another area of significant slip, of about 1 m ft, above the hypocenter.Santoyo M.A. Mikumo T. Mendoza C. amp 2007 Possible lateral stress interactions in a sequence of large interplate earthquakes on the subducting Cocos and Rivera Plates Geofísica Internacional 46 4 211–226 10.22201/igeof.00167169p.2007.46.4.50 https://www.redalyc.org/pdf/568/56846401.pdf 11 August 2012 free Damage Michoacan suffered widespread damage with some buildings also affected in Mexico City. There were 2 deaths and 17 people injured in Michoacán and 1 death and 11 people injured in Mexico City.https://earthquake.usgs.gov/earthquakes/eqarchives/significant/sig_1981.php Significant Earthquakes of the World 1981 United States Geological Survey January 5, 2010 11 August 2012 dead https://web.archive.org/web/20121011191203/http://earthquake.usgs.gov/earthquakes/eqarchives/significant/sig_1981.php 11 October 2012 One source reports a total of 9 deaths associated with this earthquake.http://www.ngdc.noaa.gov/nndc/struts/results?eq_0=4932&t=101650&s=13&d=22,26,13,12&nd=display https://archive.today/20121213225434/http://www.ngdc.noaa.gov/nndc/struts/results?eq_0=4932&t=101650&s=13&d=22,26,13,12&nd=display dead December 13, 2012 Significant Earthquake National Geophysical Data Center National Geophysical Data Center 11 August 2012 Power outages and telephone service interruptions were widespread in Mexico City.https://www.nytimes.com/1981/10/25/world/earthquake-hits-mexico-city-power-outages-widespread.html Earthquake Hits Mexico City; Power Outages Widespread Associated Press October 5, 1981 The New York Times 11 August 2012 Thousands of people got stuck in darkness in the Mexico City Metro.http://digaohm.semar.gob.mx/imagenes/CAT/Historia_tsunamis.pdfAugust 2018 InternetArchiveBot yes See also List of earthquakes in 1981 List of earthquakes in Mexico References External links 610441 Playa Azul earthquake, 1981 Category:Earthquakes in Mexico Category:1981 in Mexico Category:1980s tsunamis Category:October 1981 in Mexico Category:1981 disasters in Mexico