Which seismic zone are Zigong and Wenchuan in Sichuan located?

Zigong, Sichuan, is located on the Huayingshan fault zone, and Wenchuan is located on the North-South earthquake zone, a major earthquake zone in China.

Zigong, Sichuan is located on the Huayingshan fault zone. The surface part of the fault zone extends from Dazhou to the south, through Guang'an, Hechuan, Rongchang, Zigong, and Yibin to Yunnan. It is not very active, with only 4 ~A moderately strong earthquake of magnitude 5. Zigong has long been an area of ??moderately strong seismic activity. From 1896 to 1985, three moderately strong earthquakes with magnitudes greater than 4 occurred. Yibin and Rongchang also experienced earthquakes with magnitudes above 5.

From a large perspective, Wenchuan is located in a major earthquake zone in China - the North and South Earthquake Zone. Experts from the China Earthquake Administration believe that because the geological distribution, crustal thickness, and crustal movement speeds in eastern and western China are very different, this earthquake occurred in the zone where the biggest difference between the eastern and western parts is, that is, the north-south seismic zone - including From Ningxia through eastern Gansu and western Sichuan to Yunnan, it is an earthquake-intensive zone.

The macro explanation is that “the Indian Ocean plate collides with the Eurasian plate from south to north, and the collision area arches the Tibetan Plateau.

"Professor Ni Sidao from the School of Earth and Space Sciences of the University of Science and Technology of China analyzed, "While the Tibetan Plateau is uplifting, it is also moving northeastward, squeezing the Sichuan Basin to strike northeast, and the Wenchuan earthquake occurred in the southeast of the Tibetan Plateau. ”