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.
Biological abnormality: Some organs of many animals are particularly sensitive and can know some disasters ahead of humans. For example, jellyfish in the ocean can predict storms, and mice can avoid mine disasters or the invasion of harmful gases in advance.
Extended data:
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.
Abnormal seismic activity: there is a certain relationship between large and small earthquakes. Although there are not many major earthquakes, there are many small and medium-sized earthquakes. Study the characteristics of moderate and small earthquakes. It is possible to help people predict the occurrence of future major earthquakes.
Abnormal topographic changes: Before the earthquake, the crust near the epicenter may be slightly deformed, and the rocks on both sides of some faults may be slightly displaced. With the help of precision instruments, this very weak change can be detected, and analyzing these data can help people predict the occurrence of future major earthquakes. ?
Geophysical changes: In the process of earthquake preparation, the physical properties of rocks around the source area may change. Using precision instruments to measure the changes of gravity, geoelectricity and geomagnetism in different areas can also help people predict earthquakes.
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.
Baidu encyclopedia-earthquake
People's Network-Multi-sector early warning: Mountain torrents or geological disasters may occur in many places in the south.
People's Daily Online-Expert: Earthquakes can be predicted at least 1 to 15 days in the future.