According to Global Network , a primary school in Taitung, Taiwan Province suddenly crawled on the playground track. From a distance, it looks like a lot of thin branches are laid, but when you get closer, your scalp is numb.
According to the director of the school’s general affairs office, they once put some living earthworms back into the grass, but no matter how they were done, they were not buried. The school teacher said that the earthworms do not crawl into the corridor and therefore will not enter the classroom.
The ultimate fate of these earthworms is to be dried and sun to death by the sun. The school said that this situation has not happened for the first time. Except for some freshmen who are not used to it, everyone is not surprised.
After many residents on the island in Taiwan Province heard the news, they expressed concern:
Taiwan is in an active earthquake zone, and earthworms live in underground soil. Will you hear any sound in advance? I predict that a major earthquake will occur?
like frogs jumping around, snakes come out of the hole, fish go ashore, bats flying all over the sky, etc. "suspected signs of earthquakes" have been discussed many times before. The conclusion is that animals cannot predict and predict earthquakes. At most, it is a few seconds to dozens of seconds in advance. If you perceive an earthquake that has occurred in the distance, it can only be considered an early warning. The same is true for this earthworm incident, and it has nothing to do with the earthquake. Why is the earthquake unrelated to animals? Human beings live on the surface of the earth. Under our feet is the outer shell of the earth, called the crust. It is composed of rocks, so the outermost layer of the earth is also called lithosphere . The rocks under the earth are not a whole, they are constantly affected by the flow of magma at the bottom, thus causing movement. During the movement of the earth's crust, it will squeeze, collide or split and collapse. Because the earth's crust is slow, humans cannot perceive it. However, the interaction between the earth's crusts will continue to accumulate energy during the process of interaction between
. When the critical point is reached, it will rupture and quickly release energy, causing crust vibration. This is an earthquake.
The center point of energy released by the earth's crust is called the source . The source of the earthquake is sometimes deep and sometimes shallow. has a depth of more than 300 kilometers and is called a deep earthquake. Because it is too deep, the earthquake generally does not cause disasters. Unless the magnitude of is very high. For example, in 1934, a magnitude 9 earthquake occurred at 720 kilometers east of Sulawesi Island, Indonesia, but the arrival surface had weakened to magnitude 6.9, which is the deepest deep-source earthquake on record.
If the earthquake source is less than 70 kilometers away from the ground, it is called a shallow source earthquake, and the shallower the more destructive force is. For example, the Wenchuan earthquake has a focal depth of only 10 to 20 kilometers. The ground facing the earthquake source is called the epicenter , and is generally the most severely affected place.
The energy of earthquakes does not occupies one point or one place, but will diffuse from the source . When the originally calm water surface is thrown down a small stone, ripples will appear on the water surface, which is called waves. The lithosphere is the same as water. After the energy of the interaction between the earth's crust is quickly released, the source of the earthquake will also spread this energy in the form of waves, collectively known as the seismic wave .
seismic waves are divided into longitudinal waves and transverse waves. Simply put, when the source releases energy, it will form a thrust on the surrounding rocks, which will gradually spread and oscillate. For example, a force suddenly compresses the spring, and the spring will vibrate up and down. This phenomenon is longitudinal wave , which is manifested as up and down vibrations on the ground, spreads quickly, and has relatively little harm.
horizontal wave is the rock layer "distorted" when squeezed by energy impact. The rock that deforms after the energy burst needs to stretch out, causing the rock to shake up and down. is like a ribbon being constantly shaken by gymnasts. has peaks and troughs, also called concave and convex waves.The propagation speed of the transverse wave is slower than that of the longitudinal wave, but after it is transmitted to the ground, it will shake horizontally left and right, thereby destroying buildings or infrastructure, which is more harmful.
From the surveillance footage, you can see that at the beginning, a cat (probably a dog) seemed to sense the arrival of the earthquake in advance, but if you look closely, the car also slight up and down sways at the same time, which is the effect of longitudinal waves. Then 2 seconds later, a violent horizontal shaking begins to occur, which is the effect of the transverse wave, and finally the superposition effect.
Once you understand the earthquake process, you can know that Animals perceive the fastest and less harmful longitudinal waves in the earthquake waves in advance. Therefore, if a large earthquake occurs after an abnormal action of the animal, this is by no means a "omenon", but an earthquake has occurred. However, even animals can perceive longitudinal waves in advance, it is not very meaningful. Because the closer to the epicenter, the larger the magnitude, and the smaller the time difference between longitudinal and transverse waves, most areas with severe earthquakes will arrive at almost the same time.
If there is a large time difference between the longitudinal wave and the transverse wave, you can also watch the dog barking quietly, but the earthquake will not arrive after 1 minute. This situation means that it is too far from the epicenter and it is not very meaningful.
To sum up: It is impossible to predict earthquakes by expecting animals, and early warning of earthquakes is not very meaningful. Moreover, seismic instruments are more sensitive than animals. When receiving longitudinal waves, they will publish horizontal waves through various channels to reach the countdown.
In addition, if animals can really perceive earthquakes, it is impossible that the only one in the school would appear. Moreover, according to the school's observation, this phenomenon occurs with only one specific earthworm. Therefore, the excavation of earthworms may be more related to soil temperature, humidity, substances, and sunshine intensity. # A large number of earthworms appeared in a primary school in Taitung. A large number of earthworms appeared in the playground. Runways of the playground. # # A large number of earthworms appeared in the playground of Taitung primary school# # A large number of earthworms suddenly appeared in a primary school in Taiwan. #
