prayer! Qinghai has another earthquake, and it is 5 times in an hour, 8 times in one night, the highest earthquake magnitude reached 6.9 magnitude, I hope that friends in Qinghai are safe!
Qinghai earthquake
After New Year's Day, the news of earthquakes in Yunnan, Taiwan Strait, and Qinghai in China has been transmitted one after another, which is heart-wrenching, why are earthquakes so frequent? Previously, some experts said that the Qinghai area of Yunnan in China may be in the period of seismic activity, and the frequency of earthquakes will be higher than before.
This seismic activity period lasted about 20 years, with the last seismic activity period in Yunnan from 1988 to 1996. The main basis for judging whether an area has entered a period of seismic activity is whether there has been an earthquake of magnitude 6.7 or above in the area.
Earthquake-stricken areas
Earthquake prediction is currently a challenge for the whole world, so it is not yet possible to make accurate predictions. But nature is magical, and human intelligence is infinite, and you can be alert to the arrival of earthquakes through some abnormal reactions in nature, including:
1) Ground deformation, slight vibration;
2) Abnormal animal reactions, including cows and horses not entering the stable, winter snakes coming out of holes, dogs barking wildly, birds flying, fish out of the water, rats on the street, etc.;
Frogs take to the streets on a large scale
3) The water flow changes suddenly, and there is a ground sound, ground light, etc.
Before the Qinghai earthquake, a dazzling glare (earth light) was emitted near the distant horizon, which lasted for one or two seconds, instantly illuminating half of the sky, and this scene was just recorded by a resident's surveillance video.
Geoluminescence that appeared before the Qinghai earthquake
The reason for the occurrence of geoluminescence before the earthquake is not yet clear, some people think that it is a discharge phenomenon caused by the rapid change of geomagnetism and geoelectric field before the earthquake; others think that the piezoelectric effect of quartz crystals in rocks can produce a strong electric field; and there are also views that groundwater flow can produce high voltage. In any case, there is a lot of public opinion, there is no unification.
As we all know, the main reason for earthquakes is that the plates on the earth squeeze and collide with each other, and in vernacular terms, earthquakes are the process of rapid release of energy from the earth's crust. According to the size of the energy released, the earthquake can be divided into twelve levels, and the energy released by each level of earthquake is 31.63 times that of the previous level, of which the magnitude 3 earthquake or above is what humans can feel.
Earthquake knowledge
The energy released by the earthquake can be calculated, and the calculation formula is E = 10^4.8×10^(1.5M), where E represents the energy released by the earthquake and M represents the earthquake level.
For example, the energy released by the 6.9 magnitude earthquake in Qinghai is E=10^4.8×10^(1.5*6.9) ≈1.4×10^15J. The energy released by one ton of TNT is 4.2×10^9J, so the energy released by a magnitude 6.9 earthquake is about equal to 1.4× 10^15/4.2× 10^9≈3.3×10^5t, which is equivalent to about 330,000 tons of TNT, equivalent to the equivalent of 22 "little boys" dropped in Hiroshima.
Nuclear bomb explosion
The earthquake is terrible, one of the natural disasters facing all mankind, we need our full cooperation, mutual assistance, and finally hope that the compatriots in the disaster area are safe!