The cause of the earth's light is still unclear, and there are several explanations at present: ① geomagnetic and geoelectric fields changed dramatically before the earthquake and interacted with the ionosphere in the atmosphere; (2) Underground natural gas and other substances gush out along the ground cracks and spontaneously ignite; (3) Because the rocks were destroyed sharply before the earthquake, the fractured rocks rubbed against each other along the fracture surface, resulting in the sudden release of heat.

There are many colors of terrestrial light, such as blue and white, which are a bit like the colors of welding fire, red and purplish red. Others, such as white, yellow, orange and green, have terrestrial light, sometimes appearing in a large area in the form of covering the earth. The recorded earthquake in Huoshan, Anhui Province on March 23rd, 1652 mentioned that "the ugly earthquake came from the southwest and was red everywhere", and people also saw the ground light with a circular arc at the top. It glows in a large area in the dark, and some areas last for dozens of seconds. Others cross the sky in the form of strips, such as 1 804165438+10/.During the fifth watch, the residents of Yuanling, Hunan Province saw "the red light is a horse, from west to east.

Once the ground light is found, measures must be taken to prevent earthquakes. At this time, it is time to wait for no one.