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Tangshan Earthquake 1976

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Erika Boisvert

on 26 May 2011

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Transcript of Tangshan Earthquake 1976

K-Shahala The Event Magnitude of 7.5 July 28,1976 Aftershocks were 5.0-5.5 Magnitude 3:42 A.M. Main shake lasted 90 seconds Location Epicenter at Mt. Tangshan in Hebei, China Cities Affected: Tientsin Beijing Tangshan Hebei Shenyang Epicenter at Mt. Tangshan in Hebei, China Tangshan Cities Affected: Tientsin Beijing Tangshan Hebei Shenyang Tangshan Earthquake The Damaged Area Esther Tsai Erika Boisvert Period 3 Damage extended as far as Beijing Intensities Intensity X: 370 sq km Intensity IX: 1,800 sq km Intensity VIII: 7,300 sq km Intensity VII: 33,000 sq km Earthquake Damage Physical Damage Human Impact Chengli bridge crumpled Ordinary houses collapsed Railways bent; highways collapsed Belt of surface faulting ran through building and roads 240,000 people died in Tangshan The government predicted the death toll to be 655,000 people 799,000 injured 500,000 homeless survivors Population Economy Lost 2.5 billion in economy 40% of the homes collapsed 50% of the industrial buildings destroyed Damage was mostly repaired by September 28, 1976 Chengli Bridge Fault line Collapsed house Nowadays Tangshan The Cause Tangshan's location Yan Shan fold-fault (north of Tangshan) Shanzi fault depression structural belt (south of Tangshan) Taihang fault zone Cangdong fault zone The Pacific plate was subducting underthe Asia and the India plate. http://earthquake.usgs.gov/earthquakes/catalogs/ http://earthquake.usgs.gov/learn/animations/animation.php?flash_title=Liquefaction&flash_file=liquefaction&flash_width=450&flash_height=200 Prediction of Future Earthquakes During the Tangshan Earthquake... Nowadays... Weren't obvious foreshocks People of Tangshan weren't prepared for earthquakes of this magnitude Seismologists underestimated the intesity and magnitude Chinese seismologists didn't know much about Earth's crust and tectonic plates Didn't have advanced technology Models of tectonic plates to predict tectonic movement Satellites Seismographs Risk Reductions Ground was strengthened Buildings were made to withstand large earthquakes At Risk Locations Generally on fault lines **Alaska, Japan, Hawaii, California** Locations at plate boundaries= high risk Factoid Time!!! Second greatest death toll ever recorded 3:42 am Tangshan time; most people were asleep Tangshan was built on loose soil instead of bedrock Strange noise before earthquake from animals Made into an IMAX movie: Bibliography "Historic Earthquakes." U.S. Geological Survey Earthquake Hazards Program. Web. 10 Mar. 2011. <http://earthquake.usgs.gov/earthquakes/world/events/1976_07_27.php>. "1976 Tangshan Earthquake." Science Daily: News & Articles in Science, Health, Environment & Technology. Web. 10 Mar. 2011. <http://www.sciencedaily.com/articles/0/1976_tangshan_earthquake.htm>. "Historic Earthquakes." U.S. Geological Survey Earthquake Hazards Program. Web. 10 Mar. 2011. <http://earthquake.usgs.gov/earthquakes/world/events/1976_07_27_eib.php>. "Risk Areas for Earthquakes." University of Pittsburgh. 10 Mar. 2011 <http://www.pitt.edu/~epi2170/lecture15/sld032.htm>. Rosenberg, Jennifer. "Tangshan - The Deadliest Earthquake." 20th Century History. 10 Mar. 2011 <http://history1900s.about.com/od/horribledisasters/a/tangshan.htm>. *yay...* :D *yay!* :/ And now a word from our sponsors. We'll be right back! We're back! Huzzah!
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