At present, human beings have no means to predict earthquakes. We can only predict the long-term range of earthquakes according to the frequency and intensity of earthquakes in a certain area and the distribution of continental plates. For example, in the long run, earthquakes will definitely occur in some areas of China and Sichuan, but today's technology can't predict one or two days or even one or two hours in advance, so earthquakes always appear as expected.
Undeniably, there are many environmental changes related to earthquakes, such as the sudden rise of the temperature of ponds or other water bodies accompanied by irritating smells such as sulfur, the abnormal continuous uplift of the surface of a certain area (the Yellowstone super volcano in the United States keeps rising), the sudden signs of activity of long-term stagnant volcanoes, or a small-scale earthquake before a major earthquake, but not all these things will happen before and after the earthquake, so it is unscientific to use these to predict earthquakes.
There are rumors among the people that there were abnormal animal activities before many major earthquakes, but on the other hand, this is actually a kind of Monday morning quarterback. Coincidentally, there happened to be some abnormal animal activities before the earthquake, so people associate abnormal animal activities with the earthquake after the earthquake. If all earthquakes are counted, it is obvious that there was no abnormal animal activity before most earthquakes.
In fact, due to the movement of the earth's plates, there are more than 5 million earthquakes on the earth every year, and most of them are undetectable by human beings. Generally, earthquakes of magnitude 3 or above can arouse people's vigilance. According to the old legend, animals can detect earthquakes because they are more sensitive in some aspects, so at such a high earthquake frequency, animals can't have a normal work and rest time, and there are at least thirty or twenty perceptible earthquakes every year. In recent twenty years, there have been several destructive earthquakes in China, but there were no obvious abnormal animal activities before Wenchuan and Yushu earthquakes.
Animals with abnormal activities are all species with strong reproductive ability and a large number, such as birds flying in the sky, fish scurrying in the river and toads crawling all over the street. Because of their strong reproductive ability, the number of these animals will increase sharply in a short time, so there may be strong intra-population struggles and some abnormal activities in a certain period of time, and these creatures are more susceptible to natural changes in the environment because of their large number.
As far as fish is concerned, when I was a child, I liked to fish in a small pond formed by the ebb and flow of rivers. I mixed the water first, and then the fish surfaced, because mixed water was not good for them to breathe. Some fish wander around the pond because they are excited about the breeding season, and some fish are polluted and their dissolved oxygen drops. Large species such as lions, tigers and pandas usually have no obvious abnormal activities before earthquakes. In the 2008 Wenchuan earthquake, the giant panda in Chengdu base did not predict the earthquake in advance, but quickly climbed the tree when the earthquake occurred. It was the earthquake that frightened the animals, so there were not many casualties of giant pandas at that time.
In the process of human evolution, vision, hearing, etc. It may become weak, and its eyesight is not as good as that of an eagle, and its hearing and smell are not as good as that of a dog. Therefore, before the earthquake, some animals may reach the ground sound or perceive electromagnetic changes to predict the earthquake, but in the past statistics, the relationship between abnormal animal activities and earthquakes is not obvious. However, human beings have invented a variety of detection instruments beyond animal senses, some of which can capture harmful gases with extremely low concentration in the air and monitor extremely weak seismic waves. However, with the help of various detection instruments other than animal perception, humans cannot predict earthquakes, while animals that rely on instinct to perceive environmental changes can predict earthquakes? So this is a rumor.