Why were there colorful clouds before the earthquake?

"Earthquake cloud" refers to the banded clouds with different colors, such as white, gray, orange and orange, appearing over the earthquake zone when an earthquake is about to occur. Its distribution direction is perpendicular to the epicenter and generally appears in the morning and evening. Height and length of seismic clouds: According to visual observation, the height of seismic clouds can reach more than 6000 meters, which is equivalent to the height of high clouds in meteorological clouds.

As early as the17th century, there was a record in China ancient books that "the sky is clear at noon or after sunset, but there are fine clouds like lines, which are very long and have omens". 1935 "Rebuilding the Records of Longde County, Ningxia, China" records that "the weather is beautiful, the blue sky is clean, and suddenly dark clouds are like wisps, and Wan Ru snakes lie across the sky.

However, the international research on earthquake clouds is still in recent years, among which China and Japan are in the leading position. The study of seismic clouds in China began after the 1976 Tangshan earthquake, and there have been more than ten successful examples. In Japan, there are hundreds of successful examples of using earthquake clouds to predict earthquakes. Interestingly, it was not a seismologist but a politician who first proposed the name "earthquake cloud". He is the former mayor of Fukuoka, Japan. He once personally experienced the earthquake of magnitude 7 in Fukuoka, Japan, 1956, and saw a very strange cloud in the sky during the earthquake. As long as this kind of cloud appears in the future, there will always be earthquakes, so he called this kind of cloud "earthquake cloud".

So, what kind of clouds are earthquake clouds? The biggest feature of this cloud is "strange", which is obviously different from ordinary clouds.

The blue sky sometimes leaves traces of airplanes. The common banded seismic clouds are very similar to the wake of an airplane, but thicker and fuller. Generally, it means that the epicenter is perpendicular to the cloud direction.

In addition, there is a kind of radial seismic cloud, where several banded clouds intersect at the same time, just like a fan rib without a sector spreading in the air, and the intersection of clouds is perpendicular to the ground, which is the epicenter.

In addition, there is a striped earthquake cloud that looks like two rows of human ribs. Judging the epicenter according to this cloud is more complicated.

Earthquake clouds usually appear in the morning and evening. The longer the earthquake cloud lasts, the closer the corresponding epicenter is. The longer the earthquake cloud is, the closer it is to the earthquake. The more scary the color of the earthquake cloud looks, the stronger the corresponding earthquake intensity.

At present, there are different opinions about the cause of earthquake clouds. Although each has its own reasons, it cannot fully explain this phenomenon before the earthquake, so it is still a mystery. The earthquake itself is a very complicated process. Therefore, it is best to use comprehensive methods to predict earthquakes.

Seismologists believe that when an earthquake is about to occur, a large amount of heat will be generated due to the accumulation of geothermal energy in the earthquake zone or the strong stress and friction on the rocks in the earthquake zone. This heat will escape from the surface of the earth, warming the air, generating an updraft and forming an "earthquake cloud" at high altitude. The tail end of the cloud points to the place where the earthquake occurred. Some people think that the inevitability of "earthquake cloud" is still lack of experimental data, which may also be a coincidence. How to be specific needs further study.