Current location - Education and Training Encyclopedia - Resume - Yushu is not in the earthquake zone. How could it be an earthquake
Yushu is not in the earthquake zone. How could it be an earthquake
Zhang Ke, a professor in the Department of Earth Sciences of Sun Yat-sen University, said in an interview with Yangcheng Evening News yesterday that the Yushu earthquake was related to the Wenchuan earthquake, which may be caused by the release of crustal stress. Zhang Ke said that the Yushu earthquake, like the Wenchuan earthquake, was also an intraplate earthquake of the Eurasian plate, and the force source came from the collision between the Indian plate and the Eurasian plate, which had nothing to do with the earthquake that occurred in Taiwan Province Province yesterday morning. He believes that the Longmenshan fault zone to which Wenchuan belongs is related to the Xianshuihe fault zone to which Yushu belongs. After the Wenchuan earthquake, the block moved eastward, but the movement of the whole plate was not so synchronous. For example, the Xianshuihe fault zone where Yushu is located may be a "constraint" traction point. Where there are "constraints", the natural friction is greater and the stress is more concentrated. Therefore, the Xianshuihe fault zone became a stress release area, which led to the Yushu earthquake with magnitude 7. 1. Many earthquakes in history were caused by crustal stress adjustment. For example, the 1920 Haiyuan M8.5 earthquake in Ningxia is directly related to the Gulang M8.5 earthquake in Gansu seven years later. A recent example is the earthquake near the Caribbean after the Haiti earthquake. At that time, many experts said that the crustal stress had not been released, and sure enough, a major earthquake occurred along the Caribbean coast soon. Why did the crustal stress adjustment caused by Wenchuan earthquake appear after nearly two years? Zhang Ke explained: For human beings, although two years is a long time. But for the earth, years and decades are only a short moment. Therefore, although the Yushu earthquake has been two years since the Wenchuan earthquake, it is only a brief moment of crustal activity. Regarding whether the earth has entered a period of high activity, Zhang Ke said: "According to statistics, there was a 22-year period of seismic activity in China in the last century, in which the first 1 1 year was an active period and the last1/year was a quiet period. However, if we only do earthquake activity prediction, I am afraid it is still difficult and needs further observation and analysis. "