Abstract
Longmen Shan is located the special joint be-tween Tibetan Plateau inland in the west and Yangtze craton in the east. Consisting of a se-ries of parallel imbricated thrust, it develops, from the west to the east, the Maoxian- Wenchuan, Beichuan-Yingxiu and Pengxian- ﹡This research was supported by China National Natural Science Foundation grant 40841010, 40972083 and China National Science and Technology supporting Plan Foundation grant 2006BAC13B02-07, 2006BAC13B01-604. Guanxian faults. The Wenchuan earthquake is a thrust with strike-slip type, and thre surface ruptures are located on the Beichuan-Yingxiu fault zone and Pengxian-Guanxian fault zone. The surface rupture on the Beichuan-Yingxiu fault shows the thrust and dextral slip charac-teristic. The maximum vertical displacement of the surface rupture is about 10.3 m and the maxi-mum right-lateral displacement is about 5.85m. Though the vertical displacements and the hori-zontal displacements in the different segments have certain differences, as a whole, the ratio of the vertical displacement and the horizontal dis-placement is close to 1:1. The surface rupture on the Pengxian-Guanxian fault shows thrust and dextral characteristic. The rates of vertical dis-placements and the horizontal displacements ones on the most other segments are between 1:3 and 1:2. So the Beichuan- Yingxiu fault is a dextral-slip and thrust fault and the average ver-tical displacement is equal to the average hori-zontal displacement, while the Pengxian- Guan xian fault is thrust fault with a little dextral-slip component. The total intensity area above Ⅵ de-gree of the Wenchuan earthquake is about 333000 km2. The high earthquake intensity line stretches to N40-50°E along Longmen Shan tectonic belt. The rate of the long axis and the minor is betw- een 8:1 and 10:1. Three Ⅺ intensity regions are isolated in distribution. It presents a multipoint instantaneous characteristic of the rupture.
Highlights
According to the record of China earthquake networks, on 12th May, 2008, a huge earthquake Ms8.0 struck Yingxiu town in Wenchuan county, Sichuan province (31°00′N, 103°24′E)
The earthquake took place at 14:28:04(Beijing time) and the depth of its hypocenter is about 14 kilometers. This earthquake with high magnitude and shallow hypocenter made an astonished attack on Longmen Shan area, which is located in the west of Sichuan basin, resulting in tremendous casualties and property losses
The earthquake occurred on Longmen Shan tectonic belt at the eastern margin of the Tibet Plateau
Summary
According to the record of China earthquake networks, on 12th May, 2008, a huge earthquake Ms8.0 struck Yingxiu town in Wenchuan county, Sichuan province (31°00′N, 103°24′E). The earthquake took place at 14:28:04(Beijing time) and the depth of its hypocenter is about 14 kilometers. This earthquake with high magnitude and shallow hypocenter made an astonished attack on Longmen Shan area, which is located in the west of Sichuan basin, resulting in tremendous casualties and property losses. The earthquake occurred on Longmen Shan tectonic belt at the eastern margin of the Tibet Plateau. Within the range of 50 kilometers along Longmen Shan tectonic belt, topographical fall exceeds 5 kilometers, which produces mountains and canyons region [1,2,3,4,5]. This paper was devoted to those who had been died or disappeared in this destructive earthquake
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