What's with the sudden water in the dry well?

Suddenly there was water in the dry well. First, there is too much rain and the groundwater level rises. It may also be a precursor of an earthquake, but we should refer to other abnormal natural phenomena and the forecast of the meteorological department. Because earthquake precursors are still controversial, at least there is no very certain phenomenon that can occur and be caught before every earthquake.

Abnormal water includes well water and spring water. The main anomalies are turbidity, bubbling, flowering, temperature rise, discoloration, off-flavor, sudden rise, sudden drop, sudden exhaustion or gushing.

Microscopic precursors of earthquakes:

Earthquake precursors that can't be detected by human senses and can only be measured by special instruments are called microscopic precursors of earthquakes, which are referred to as microscopic precursors for short. Changes of underground fluids: Groundwater (well water, spring water, water contained in the underground), oil and natural gas, and other gases may be generated and stored in underground rocks, which are all underground fluids.

Measuring the chemical composition and some physical quantities of underground fluid with instruments and studying their changes can help people predict earthquakes.