As a result of,the earthquake is mainland board piece a mutual extruding collision cause, human development always is accompanying all sorts of natural disaster in the process, and the earthquake is among them a kind. Seismic harm is massive, besides cause geological change, still can cause ground fire, flood to wait. Shake of a lot of earths has happened on the history, cause very great harm, be like on April 18, 1906 5 when the shake of 8.3 class earth that happens 13 minutes in American san Francisco, on September 1, 1923 11 when the earth shake that happens 58 minutes in Japanese Tokyo. And the earthquake with the bitterest casualties on Chinese history happens at Ming Dynasty Jia Jing year. Earthquake with the biggest casualty of the earthquake on world history, dead number reachs 1.1 million person, happened in July 1201, the place is area of Mediterranean the eastpart part. | | | The shake of earth of 8 class above that our country has account the earliest is shake of yuan of day period earth, on September 17, 1303, yuan Dade 7 years, city of big hole Zhao produces Shanxi shake of earth of 8 class above. According to historical data account, housing collapses entirely, "Civilian house official abandons nothing left " ; The landforms of mountains and rivers-land of some places is changed completely, do not admit completely to go out originally appearance. Return account additionally, dead number exceeds 200 thousand. Shanxi each district still stores the epitaph carved stone of this earthquake now. Earthquake with maximum number of the death on Chinese history produces Yu Mingjia pacify, the position is Shaanxi China county. Ming Jiajing 34 years on December 12, shaanxi China county produced the Christian era 1556 the big earthquake of more than 8 class, seismic grade should be between 8~8.5 class. Bright history " medium account: "Shaanxi, Shanxi, Henan is coinstantaneous earthquake, sound is like thunder, south China city, short for Weihe River, Chao Yi, Pu Zhou, 3 wait for place blame formerly very, the ground cracks a spring to emerge, there is piscine thing in, or house, in indulge in ground, flat dash forward Cheng Shanfu, one day counts shake, tired day shake is more than, hua Yue of great flood of river, short for Weihe River, eventually Na Shanming, river Qing Dynasty counts day, government official, the army and the people is pressed dead thirty thousand and eighty. And other places of Shaanxi, Shanxi, Gansu Province, Shandong, Heibei, Henan, Hunan, Hubei all has be affected, a little stricken be hit by a natural adversity and serious county produces integral cave in. According to " bright history - annals of the five elements " account: "Government official the army and the people is pressed dead thirty thousand and eighty have strange. " this 830 thousand person is statistic is famous the public figure that the surname has number of households and total population, some are not famous the dead that perhaps did not appear in the newspaper is countless more. | | | This has peculiar sign before second earthquake, also be to have the big earthquake with account augural earthquake first. " Long Qing - China state records " account before this earthquake 8 hours, because the ground moves,once appeared in epicentral area, cause the appearance of person dizziness. In the meantime, peculiar appearance of fire gives in the ground appearing when this earthquake, namely subterranean bright goes out fully. The Qin Dynasty of bright generation official can kiss all previous to cross shake of China county earth greatly, be in later " the earthquake writes down " in write: "Get disaster number, the dead's assorted of Tong, cattail 7, with, assorted of Hua Zhi's dead 6, the dead's assorted south short for Weihe River 5, the dead's assorted that faces Tong 4, the dead's assorted of provincial capital 3, and other city county, criterion the place with the ground pares get rid of is close far cent depth. Criterion the place with the ground pares get rid of is close far cent depth.. China county earth is accompanying bigger aftershock inside shake half an year, the time aftershock that is as long as 3 years is ceaseless, till 5 years of ability slowly overblown. According to in those days population amount, but 830 thousand person is occupied than very big, and accompanying drought, stricken be hit by a natural adversity area is footprint of person of 10 thousand diameter really destroy.