on the evening of August 8, a 7.0-magnitude earthquake struck Jiuzhaigou County, Aba Prefecture, Sichuan Province, causing social concern. Expert analysis said that the earthquake and the 2008 Wenchuan earthquake have no actual connection, but the two earthquakes have the same cause. So what is the cause of the Jiuzhaigou earthquake in Sichuan?
According to the official wechat of China Seismological Network, at 21:19 on August 8, a 7.0-magnitude earthquake occurred in Jiuzhaigou County, Aba Prefecture, Sichuan Province (33.20 degrees north latitude and 103.82 degrees east longitude), with a focal depth of 20 kilometers.
For the strong earthquake, sun Shizhen, a researcher at China Seismological Network Center, analyzed with zhongxin.com that the earthquake was not in the aftershock period of Wenchuan earthquake, so there was no actual connection between the two earthquakes. But Sun stressed that there were more earthquakes in this area in history. On August 25, 1933, an earthquake with a magnitude of 7.5 occurred in Diexi, Sichuan Province, with a crack degree of 10 degrees.
Diexi is only about 100 kilometers from the epicenter of the earthquake, Sun said. At that time, the earthquake killed more than 6800 people, and a barrier lake was formed after the earthquake. The dam broke 45 days after the earthquake, which also caused death, so the casualties of the earthquake were relatively large.
'the magnitude of this earthquake is smaller than Diexi earthquake, and the expected cracking degree is 9 degrees. According to sun Shixuan's analysis, the crack degree of this level means that most houses in the epicenter area will have moderate or serious damage, surface cracks will appear in the epicenter area, in addition, landslides, landslides and other phenomena will occur, and geological disasters such as debris flow may occur in case of rain.
Sun Shixuan explained that the cause of the earthquake was the same as that of Wenchuan earthquake, that is, the subduction of Indian plate to Asian plate resulted in the rapid uplift of Qinghai Tibet Plateau and the earthquake.
According to the official wechat of China Seismological Network, there were many aftershocks after the strong earthquake. As of 23:00 on August 8, a total of 106 aftershocks have been recorded, including 0 with m s5.0-5.9, 0 with m s4.0-4.9 and 2 with m s3.0-3.9.
[summary of the latest news: the earthquake has killed 9 people] ① as of 5:00 a.m. on August 9, the earthquake has killed 9 people and injured 164 people. Xi Jinping made important instructions: to minimize casualties; Li Keqiang gave instructions. ③ the armed police, fire control, health and other departments and the army have been dispatched rapidly, and the rescue work has been carried out all night. (4) Jiuzhaigou scenic area is temporarily closed. May the number of casualties no longer increase, and may the disaster area be safe!