Earthquake: A devastating disaster comparable to the explosion of a mushroom bomb, such as the Pompeii earthquake, which directly submerged the entire city of Pompeii and sank into the ground, is enough to illustrate the horror of earthquakes
Today, I will give you a popular science article about the "silent signs" before the earthquake, hoping that in case of an earthquake, you can take preventive measures in advance
Why some earthquakes can be prevented in advance, we must first know how earthquakes are formed
In simple terms, an earthquake is a shaking caused by the energy generated by the collision movement of the earth's center and crust, which is what causes earthquakes
Therefore, when the energy of the earth's crust jumps in front of the earth, it will not release the energy instantly, it has a cyclical and gradual process
In this process of releasing energy, there are some small details that have been told in advance that the earthquake is coming
[1]: Slight vibration and abnormal sound
Generally, large earthquakes usually have a slight tremor to feel the ground first, because the energy released by it is affected by the earth's crust, which causes the low-level to break and then delay the occurrence of the friction, and cannot trigger all its energy instantaneously
When the first small energy reaches the ground, it causes a slight vibration, and it is accompanied by a certain sound, which is different from what you usually hear, similar to the sound of two pieces of wood squeezing and deforming
If you feel a slight tremor or a strange sound that is different from usual, then you should pay attention, it is very likely that it is a "warning" before the earthquake is coming
[2]: Water level changes and geotechnical changes
As mentioned at the beginning, an earthquake is a stratum fracture caused by the movement of the earth's core crust, and there will be a series of changes after the stratum fracture at the location
First of all, because the strata are fractured, most of the mountains will be displaced or landslides due to the instability of the mountain foundation, which is the first manifestation
The second manifestation is that the water level drops, and a large gap will appear after the stratum is broken, and the water source in the location will be exposed due to "loopholes", such as rivers and lakes
If the water level drops suddenly and sharply, in addition to the upstream interruption, then it is very likely that it is a "water leakage" caused by a fracture in the formation, so you should be vigilant......
[3]: Abnormal animal behavior
This is based on the observations of most people, many of whom have reported seeing some unusual behavior of animals before the earthquake
For example, a large school of fish repeatedly jumps sideways, birds continue to hover in the sky and dare not fall home, and domestic animals such as chickens, ducks, geese, and puppies are restless
Animals have much stronger sensory abilities than humans, so they can feel subtle changes in advance before some disasters come, especially because the stratum fractures caused by crustal movements can be accurately perceived, so the abnormal behavior of animals is also a node that can roughly predict before the earthquake
The above three points are changes that we can intuitively feel from the naked eye, and other changes such as magnetic force we can't find, if the above three situations occur, then we should pay attention to them and take defensive measures
Defenses:
(1): After perceiving a slight change, you can run to an open area in advance and pay attention to falling rocks, iron frames and other objects falling from high altitudes
(2): If you feel a slight vibration several times in a row in your sleep, then you should pay attention to the protection in advance, and do not wait in place, which is very likely to be some "appetizers" before the earthquake
(3): If you are in the midst of a vibration outbreak, find some hard objects as protective covers, such as desks, wardrobes, etc., to prevent bricks from falling
You can find the root of the wall or the triangle of the building to take refuge, which is the most load-bearing part of the building, which can reduce the risk of being smashed