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1786 Kangding Luding earthquake Language Watch Edit An earthquake occurred on 1 June 1786 in and around Kangding in what is now China s Sichuan province It had an estimated magnitude of about 7 75 and a maximum perceived intensity of X Extreme on the Mercalli intensity scale The initial quake killed 435 people After an aftershock ten days later a further 100 000 died when a landslide dam collapsed across the Dadu river 1786 Kangding Luding earthquakeShow map of SichuanShow map of ChinaLocal dateJune 1 1786 1786 06 01 Local timeMidday 1 Magnitude7 75 Mw 1 Depth20 km 12 mi 2 Epicenter29 54 N 102 00 E 29 9 N 102 0 E 29 9 102 0 Coordinates 29 54 N 102 00 E 29 9 N 102 0 E 29 9 102 0Areas affectedSichuan Qing Dynasty of ChinaMax intensityX Extreme LandslidesManyCasualties435 from the earthquake and about 100 000 from the failure of the landslide dam Contents 1 Tectonic setting 2 Earthquake 3 Landslide dam 4 Damage 5 See also 6 ReferencesTectonic setting EditSichuan lies within the complex zone of deformation associated with the continuing collision between the India Plate and the Eurasian Plate The thickened crust of the Tibetan plateau is spreading to the east causing the southward motion of the Sichuan Yunnan block The eastern side of this block is bounded by the Xianshuihe fault system a major left lateral strike slip fault zone Movement on this fault zone has been responsible for many major damaging earthquakes 3 such as the 1981 Dawu earthquake 4 Earthquake EditAn isoseismal map constructed for this earthquake shows that the zone of maximum shaking was elongated in a northwest southeast direction parallel to the trace of the Xianshuihe Fault The magnitude of 7 5 8 0 has been estimated from the extent of the intensity VIII Severe zone Remote sensing techniques backed up by a field survey identified a 70 kilometre 43 mi long zone of surface fault rupture thought to be associated with the earthquake The active fault segment has been identified as the Moxi Fault 2 Landslide dam EditThe earthquake triggered numerous landslides one of which blocked the Dadu River forming a temporary lake The dam was about 70 metres 230 ft high holding back an estimated water volume of about 50 000 000 cubic metres 65 000 000 cu yd By 9 June the lake had started to flow over the dam and an aftershock on 10 June caused the dam to collapse suddenly releasing the impounded water and devastating areas downstream 2 It is the second deadliest landslide disaster on record after the 1920 Haiyuan earthquake 5 Damage EditThe earthquake caused widespread damage in the epicentral area The city walls at Kangding collapsed and severe damage to many houses and government buildings caused 250 casualties In Luding County 181 people were killed in collapsed buildings At both Qingxi and Yuexi parts of the city walls were destroyed and many buildings were severely damaged causing further casualties 1 The flood that resulted from the landslide dam failure reached the city of Leshan on 11 June causing collapse of part of the city walls Spectators who had gathered to watch the flood from the walls were thrown into the water The destructive effects of the flood continued downstream at Yibin and Luzhou with an estimated 100 000 people being killed overall Local residents made a memorial tablet describing these events which is now kept at the Seismological Office in Luding 2 See also EditList of earthquakes in China List of earthquakes in Sichuan List of historical earthquakesReferences Edit a b c National Geophysical Data Center Significant Earthquake Retrieved 30 November 2012 a b c d Dai F C Lee C F Deng J H amp Tham L G 2005 The 1786 earthquake triggered landslide dam and subsequent dam break flood on the Dadu River southwestern China PDF Geomorphology 65 3 4 205 221 Bibcode 2005Geomo 65 205D doi 10 1016 j geomorph 2004 08 011 Retrieved 2 December 2012 Cole S Xu Y amp Burton P W Seismic hazard of the North South Seismic Zone in China PDF First European Conference on Earthquake Engineering and Seismology pp 1 10 Archived from the original PDF on 12 December 2013 Retrieved 1 December 2012 Zhou H Liu H amp Kanamori H 1983 Source processes of large earthquakes along the Xianshuihe Fault in southwestern China PDF Bulletin of the Seismological Society of America 73 2 Archived from the original PDF on 23 July 2010 Retrieved 1 December 2012 Schuster R L Wieczorek G F 24 26 June 2002 Landslide triggers and types In J Rybar J Stemberk P Wagner eds Landslides Proceedings of the First European Conference on Landslides Prague Czech Republic A A Balkema Publishers p 66 ISBN 978 90 5809 393 6 Retrieved 30 November 2018 p 66Retrieved from https en wikipedia org w index php title 1786 Kangding Luding earthquake amp oldid 1027892747, wikipedia, wiki, book,

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