At 21:19 on August 8, a 7.0-magnitude earthquake occurred in Jiuzhaigou County, Aba Prefecture, Sichuan Province, with a focal depth of 20 km, the epicenter of which is located at 33.20 degrees north latitude and 103.82 degrees east longitude. Every time an earthquake comes, it will bring a huge disaster, so many people will have such a problem. Can we predict it in advance?
At 7:27 on August 9, a 6.6-magnitude earthquake occurred near Jinghe County, Bortala Prefecture, Xinjiang (44.27 n, 82.89 E), with a focal depth of about 11 km.
In fact, not only can China Seismological Bureau not predict earthquakes in advance, but there is no national earthquake unit in the world that can predict earthquakes in advance. So far, the human experience of earthquake prediction is not enough. Many earthquake signs are post event reports, which can not be confirmed in advance. Japan is a country with frequent earthquakes. After the war, they mainly focused on earthquake resistant structures, that is to say, building strong houses. When an earthquake strikes, houses can resist earthquakes without falling down. This should be a relatively successful experience. However, the Kobe earthquake and Fukushima earthquake caused heavy losses to Japan. If there is a prediction that the nuclear power plant can be shut down, the reactor can be shut down, and the natural gas pipeline can be shut down before the earthquake, the losses will be much smaller, and the subsequent tragedy of Fukushima nuclear power plant will not happen.
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Before the big earthquake, there were various signs, such as fish floating and turning white, animals fleeing in succession, poultry barking and so on. These phenomena are called animal anomalies in seismology. There are eight kinds of anomalies about earthquake precursors in seismology, one of which is animal anomaly.
However, there are many reasons for animal abnormalities, such as restlessness of pig arch or cattle, which may be scared or estrus, so it is difficult to see that such abnormalities are related to earthquakes in advance. However, many anomalies are retrospectives after the event. It's hard to say how much this has to do with the earthquake.
In addition, the occurrence of abnormal phenomena is not universal and widespread. For example, someone reported that the fish in the fish pond turned white and bubbled, but only one or several fish ponds changed, and there was no abnormality in other fish ponds. How to judge this is the precursor of the earthquake? So it is very difficult to judge the earthquake by animal abnormality.
In the face of the disaster, we are all small, life is fragile, the earthquake is merciless, friendship. Unite as one and fight against the disaster.
Pray for the peace of Jiuzhaigou people and Jinghe county people.