Can earthquakes be predicted? What is considered as an earthquake precursor?

2. Macro precursors of earthquakes: People's senses can directly perceive earthquake precursors, which are called macro precursors of earthquakes. The more common ones are the sudden rise and fall of well water, discoloration and odor, flowering and bubbling, temperature fluctuation, sudden change of spring water flow, sudden change of hot spring water temperature, abnormal animal habits, earth sound and earth light before the earthquake, etc.

3. Macroscopic precursors play an important role in earthquake prediction. Before the 1975 Haicheng earthquake with M = 7.3 and the 1976 Songpan-Pingwu earthquake with M = 7.2, seismologists and the general public had observed a large number of macroscopic anomalies, which provided important information for the successful prediction of these two earthquakes. However, we should also pay attention to the various macro phenomena listed above, which may be caused by various reasons, and are not necessarily signs of earthquakes.

4. for example; The group fluctuation of well water and spring water may be related to rainfall, and may also be affected by nearby pumping, drainage and construction. The discoloration of well water may be caused by pollution, and the abnormal behavior of animals may be related to weather changes, diseases, estrus and external stimuli. Also be careful not to mistake welding arc light and lightning for earth light, and don't mistake thunder for earth sound.