Is thermal anomaly a precursor to an earthquake?
1September 2, 679, the weather was very hot before the Sanhe and Pinggu M 8 earthquakes in Hebei Province. Although it is September, it is still unbearably hot.
1925 March 16, before the Dali earthquake, it was blocked by yellow fog, and it didn't rain for a long time, and it was not cold at night and not exposed in the morning, forming a typical dry and cloudy weather.
1933 Sichuan Diexi earthquake was also recorded in this way:? It was very sunny and hot for several days, especially before the earthquake, which happened at 2: 30 pm. At night, the weather changed suddenly, the wind was blowing hard, the rainstorm suddenly came, and the ground suddenly moved at ten o'clock. ?
On March 8th, Xingtai earthquake, Hebei province, 1966, the ground in the earthquake area thawed early and rejuvenated early. According to meteorological data, the daily average temperature rose from-13℃ to 12℃ a few days before the earthquake, with an increase rate as high as 25℃.
1969 On July 26th, an earthquake occurred in Yangjiang, Guangdong Province. A few days before the earthquake, the local climate was very special, and the weather was particularly sultry and uncomfortable.
1970 65438+1October 5, Yunnan Tonghai earthquake. February is the lowest month in a year, but a few days before the earthquake, the weather became hot; The night before the earthquake was particularly stuffy, many people couldn't sleep, and the wind felt very hot on their faces.
1February 6, 973, Sichuan Luhuo earthquake, the highest temperature in recent days before the earthquake was higher than the same period of last year.
1 974 May1,Yongshan earthquake, a few days before the earthquake, it was particularly sultry and hotter than June.
Summer in China is often controlled by warm and humid ocean air masses. Before the earthquake? Thermal anomaly? It promotes the strengthening of convection, which is often accompanied by heavy rain. After the heavy rain, the weather became hotter and reached its climax before the earthquake. 1976 after the Tangshan earthquake, it rained cats and dogs underground in Beijing and Tianjin, followed by strong aftershocks. In spring and autumn, thermal anomalies often cause continuous rain or long-term drought, which varies from region to region.
It is found that the greater the change of air pressure, the more earthquakes, and earthquakes in mountainous areas occur when the air pressure drops.
Hot and cold alternate, earthquake strikes? 、? Long sunny day, long cloudy day? 、? Is it sunny in the early morning and cloudy in the late morning? Proverbs, etc , all illustrate the relationship between weather changes and earthquakes. When the weather changes, it may be that the atmospheric pressure in various parts of the crust is uneven, which leads to the intensification of fault activity in the area where the earthquake is about to occur; Or the impending rupture of the earth's crust will release heat and make the weather hot. Historically, earthquakes often occurred after severe droughts and floods, which may be due to the change of groundwater, which destroyed the original balance and triggered earthquakes.
Earthquakes are related to weather changes, but how big and how regular the relationship is remains to be further studied.