The earthquake in Beijun occurred in Chen Bing in September of the Western Han Dynasty (BC 165438+ 101). According to historical records, the earthquake affected "more than 30 bad battlements from Jingshi to Beijun, with 415 deaths" (Hanshu? 6? 1 five elements "). The capital is now Xi City, Shaanxi Province. The northern counties in Han Dynasty should include Gansu, Shaanxi, Shanxi, Hebei and other provinces. There is a record in the history books about this earthquake that "water came out and the earth shook", which may be the earliest record of abnormal changes of groundwater before the earthquake in China. The Jincheng and Longxi earthquakes in Gansu occurred in February of the 3rd year of Yonghe in the Eastern Han Dynasty (1February 28th, 38). According to preliminary research, this earthquake is the first destructive earthquake recorded by a seismograph (Zhang Heng's waiting seismograph) in human history. At that time, the seismograph was placed in Luoyang, about 700 kilometers away from the epicenter. Jincheng County in the Eastern Han Dynasty includes today's Lanzhou City. The order of magnitude estimation is an order of magnitude. During the earthquake, "the banks of the two counties collapsed and the ground sank" ("Han? 6? 1 Ji), "Earthquake cracks, how bad battlements and rooms are, killing people" ("Being? 6? 1 five elements "). 150 1 year 65438+1October 29th (14th year of Ming Hongzhi) Chaoshan, Shaanxi (34.8 N,110.1e) M7 (epicenter intensity ≧) Damaged more than 5,400 government and civilian houses, crushed men and women 160 people, and killed many first animals; ..... "(Records of Hongzhi 170)" ... According to the application of our county government, the county buildings, stacks, government warehouses and military and civilian houses in () county were all collapsed, with a total of 5,485 rooms, with more than 70 men and women killed/kloc-0, 94 injured and 39 dead animals. ..... If the flood current shakes the crack, which is about one or two feet long or four or five feet long, the overflowing water will come out and stop for a long time; Caijiabao, Yanbo Village, etc. , pouring out everywhere, several streams turned into rivers. "(The Memorial of Ma Duan Su Gong, Volume 7)1556 65438+1On the night of October 23rd, a great earthquake occurred in the Weihe River basin, north of Qinling Mountain in southern Shaanxi Province, China. It is one of the famous historical earthquakes with extensive influence and heavy losses in densely populated areas of China, with an estimated magnitude of 8. According to historical records, the earthquakes in Weinan, Huaxian, Huayin and Yongji counties in Shanxi are the most serious, so it is called Huaxian earthquake. The earthquake damaged 10 1 county, covering about 280,000 square kilometers in Shaanxi, Gansu, Ningxia, Shanxi and Henan provinces. The earthquake was felt in 227 counties in 5 provinces. The epicentre is Weinan, hua county, Huayin, Tongguan, Chaoyi and Yongji counties in Shaanxi Province, about 2,700 square kilometers east of xi. 97 states in Shaanxi, Shanxi and Henan provinces were damaged. Aftershocks move three or five times a month for half a year, and stop for three years, and then stop in five years. The catalogue number of earthquakes of magnitude 4 or above since 1970 in Shaanxi Province: time of occurrence, epicenter location, magnitude depth (km) year, month, day, hour, minute, second, latitude and longitude, place name MLMS11974.5+016-. 720 Jingyang 5.24.814102003.4.24 06-37-30.48108 20.04' 3312.1'Shiquan4.
On may 27th, 2008 16: 37 (Beijing time), an earthquake of magnitude 5.7 occurred in Ningqiang, Shaanxi (the epicenter was located at 32.8 degrees north latitude and 105.6 degrees east longitude).