On record, there have been 8.0+earthquakes 19 times in Chinese mainland (including the Wenchuan earthquake just happened). They are 65438+8.0 in Hongdong, Shanxi Province in September, 10 in Tibet 14 165438+8.0 in October, 8.3 in Huaxian County, Shaanxi Province in February and 65438+8.0 in Tianshui, Gansu Province in July. 1679 September, Hebei Sanhe Pinggu 8.0, 1739, Ningxia Pingluo-Yinchuan 8.0,/kloc-0.8/0.2 March, Nilek, Xinjiang 8.0,1879 July, Wudu, Gansu 8.0,679 July. September 1833, Yunnan Songming-Yanglin 8.0; August 1902, Artux, Xinjiang 8.3; February 1920, Haiyuan, Ningxia 8.5; May 1927, Gulang, Gansu 8.0; In May, 1938. 1August 950, Chayu-Medog 8.6 in Tibet, 195 1,1,Dangxiong 8.0 in Tibet, August 2006, 5438+0,1. Since 1900, there have been 24 earthquakes of magnitude 7.5 or above in Chinese mainland, including 8 earthquakes of magnitude 8 or above. Among them,1August, 950, the Chayu-Medog M8.6 earthquake in Tibet, with the largest magnitude, occurred at 10 in the evening, causing about 4,300 deaths (including India 1500 deaths). 1556 In February, an earthquake of magnitude 8.3 in hua county, Shaanxi Province killed 830,000 people, making the death toll caused by this earthquake the highest in the history of all times. 1411/The earthquake of magnitude 8.0 in Dangxiong, Tibet in June caused a 700-meter-long ground fissure in Zhari Mountain and a collapsed basin in Balda District.