How does the thermal anomaly occur?

Summer in 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 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.

Proverbs such as "alternating cold and hot, earthquake strikes", "sunny and cloudy" and "sunny 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.