Why was it so hot before the earthquake?

Examples of thermal anomalies before earthquakes

1September 2, 679, before the Sanhe earthquake in Hebei and the Pinggu earthquake in Beijing, the weather was particularly hot. 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, Diexi earthquake in Sichuan province. There is also such a record: "It was extremely sunny and hot for several days, especially before the earthquake, which occurred at 14: 30 in the afternoon. At night, the weather changed suddenly, the wind was blowing hard, the rainstorm suddenly came, and it suddenly moved at 22 o'clock in the evening. "

1March 8, 966, Xingtai earthquake, Hebei province. The ground in the earthquake zone thaws, and spring comes back to the earth early. According to meteorological data, the daily average temperature in the days before the earthquake suddenly rose from-13℃ to 12℃, with a fluctuation range of 25℃.

1969 On July 26th, an earthquake occurred in Yangjiang, Guangdong. 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. Originally, June+10 in 5438 was the lowest month in a year, but a few days before the earthquake, the weather became hot. The night before the earthquake was particularly sultry, many people couldn't sleep, and the wind felt warm on their faces.

1973 February 6, Sichuan Luhuo earthquake. The average temperature before the earthquake was higher than that in the same period of last year.

1 974 May1,Yongshan earthquake. The days before the earthquake were particularly sultry, even hotter than in June.

Relevant situation analysis

In summer, China is often controlled by warm and humid ocean air masses. The thermal anomaly before the earthquake promoted the strengthening of convection, which is often accompanied by heavy rain. After the heavy rain, the weather became hotter and hotter, reaching its climax before the earthquake.

1976 after the Tangshan earthquake, it rained cats and dogs underground in Beijing and Tianjin, followed by strong aftershocks.

It is found that the greater the pressure changes, the more earthquakes there will be. However, when the air pressure drops, earthquakes in mountainous areas account for a large proportion.

Proverbs such as "alternating cold and hot, earthquake strikes", "sunny and cloudy" and "cloudy in the morning and cloudy in the evening" all explain 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.