During the Xianfeng period, it happened in Daluba and Houba areas at the junction of Qianjiang River. It reaches Wushan, Sichuan in the north, Jishou, Hunan in the southeast and Nanchuan, Sichuan in the southwest, with a maximum radius of 230 kilometers and a sensing area of over1.2000 square kilometers. As Xiaonanhai is located in the fold belt of eastern Chongqing and western Hubei, with Sinian metamorphic rocks as the basement, the recent tectonic movement is mainly characterized by large-scale uplift. The occurrence of the earthquake is related to the local basement fracture.
The earthquake landslide occurred in 10 and 15. The residents were all dust and more than 300 houses were crushed. The mountain was interrupted, sank and jumped, and even the mountain was pushed for several miles, and more than a dozen small mounds poured out of the ground. The river course is bounded by rocks, and the current is retrograde, flooding for more than 20 miles. From Xujiawan, Banqiao River to Shepanxi, there are lakes (that is, Xiaonanhai).
Ruins scenic spot
The Xiaonanhai earthquake, which was disastrous at that time, has preserved two major earthquake sites so far: one is a natural dam, with a length of1170m, a height of 67.5m and a bottom width of1040m. The dam is densely covered with rolling stones, which are huge and ferocious in shape. The biggest rolling stones exceed 10,000 tons. Second, five streams, such as Banjiaxi, Baihexi, Baifanxi, Qingxigou and Xiaoxigou, are blocked by natural dams, with a length of 5 kilometers, the widest point 1 km, and the lake area is 2.87 square kilometers.
Xiaonanhai natural lake, accumulated rainfall area 150 square kilometers. Because the earthquake site is well preserved and large-scale, it has high scientific investigation value and tourism value. Xiaonanhai is located in Qianjiang District, east of Chongqing? In xiaonanhai town. Formerly known as Xiaoying Sea. Covering an area of about 30 square kilometers, it is an alpine freshwater lake scenic spot integrating mountains, water, islands and Gorges. People call it "the pearl of the deep mountain" and "the fairyland on earth".
The above contents refer to Baidu Encyclopedia-Qianjiang Earthquake.