What fault zones are there in Gansu?
1. Anren Fault Zone: Located in the southeast of Gansu Province, it is the seismogenic fault of Wenchuan earthquake and Lushan earthquake, and is one of the main structural boundaries at the junction of eastern China and Qinghai-Tibet Plateau plate.
2. Chifeng River Fault Zone: Located in the north of Gansu Province, it is the boundary zone between Altun Mountain and other mountains, and it is a famous first-class active fault in China. The fault zone is active frequently and there have been many strong earthquakes.
3. Shangdeng Fault Zone: Located in the northwest of Gansu Province, it is one of the main fault zones around Lanzhou. This fault zone is widely distributed and frequently active, and it is the main source of seismic activity in Lanzhou area.
4. Anding Fault Zone: Located in the south of Gansu Province, it is an important fault zone in Gansu Province. The fault zone is active frequently and there have been many earthquakes.
5. Huangtupo Fault Zone: Located in the northeast of Gansu Province, it belongs to the border zone between the Loess Plateau and other regions. The frequent activities of fault zones have an important impact on the geomorphological development in this area.
The Lajishan fault zone where Jishishan in Gansu Province is located.
The southeast of Gansu is located on the eastern edge of the Qinghai-Tibet Plateau, which is a part of the North-South seismic belt. From the focal mechanism solution, it is a reverse fault earthquake, and it is speculated that the seismogenic fault is the fault on the northern margin of Laji Mountain in the northwest direction.
Lajishan fault zone is a regional fault with strong activity. Some experts believe that Lajia culture, which is tens of kilometers away from the epicenter of this earthquake and about 4,000 years ago, was destroyed like Pompeii in Italy, which is closely related to a strong ancient earthquake on the Laji Mountain fault zone.
On the remote sensing image, the shadow of Laji Mountain is obvious, with dark tones and complex texture. This is because the erosion of surface water has led to the development of Laji Mountain Valley. The ridge line is clear and the terrain fluctuates greatly, which is in obvious contrast with Xining basin on the north side. The north and south sides of Lajishan fault zone are bounded by the northern and southern faults respectively, forming a group of arc thrust structural zones-Lajishan fault zone, with an average width of only 10km.