Jiuzhaigou, Sichuan province was hit by a magnitude 7.0 earthquake. What were the astronomical phenomena before the earthquake?

Astronomical phenomena have their own laws. Some astronomical phenomena are related to activities on the earth, such as our tides. Meteorology also has its own laws, but the so-called earthquake clouds that are widely circulated on the Internet are completely pseudoscience. How clouds in the sky have nothing to do with rocks deep in the earth.

There are also circulating well water churning, abnormal biological activities and so on In fact, there are many situations that can lead to these phenomena, but we usually don't pay much attention to them. Therefore, although some types of earthquakes may cause this phenomenon, this information is mixed with other possible situations and cannot be used for prediction. What's more, some types of earthquakes will not cause this phenomenon at all.

Earthquake prediction needs accurate report, accurate time, epicenter depth and focal intensity (intensity). Geologists try to explore the law of earthquake occurrence and predict earthquakes in advance. But almost all the attempts failed. Fundamentally speaking, earthquake is a critical phenomenon, and the data we know about the underground are not clear, and it is not clear when the tension in the rock reaches what level.

Geologists can find out the distribution of underground seismic belts, including predicting which areas are prone to earthquakes (such as Hengduan Mountain where Wenchuan is located, such as the famous Pacific Rim seismic belt and Himalayan Alps seismic belt). There are also several famous earthquake zones on the mainland, and these areas need to focus on strengthening defense. For example, building standards, usual drills and monitoring.

At present, it is internationally recognized that earthquakes cannot be accurately predicted. Shockproof is very important. First, improve the quality of buildings, strengthen peacetime drills, so that most people know how to escape or avoid when an earthquake comes, and improve their chances of survival. The second is to strengthen the technical report in advance to compete with the earthquake. For example, Japan has a monitoring system. When an earthquake occurs in the epicenter, a report can be quickly released to the surrounding areas dozens of seconds in advance, so that people can strive for survival time.