The earthquake is coming, is it useful to warn again?

The earthquake is coming, is it useful to warn again? Although the earthquake has come, early warning can still play a great role. Early warning means that after a disaster occurs, the disaster is quickly transmitted to the area that may be affected, so as to win at least a few seconds and more than a few minutes. Statistical research shows that if the earthquake warning time can reach 20 seconds, the casualties will be reduced by 63%. Even if the warning time is only 3 seconds, the casualties will be reduced 14%. Therefore, after receiving the earthquake warning, no matter how much time you have, don't stay where you are, and quickly escape or avoid.

Forecast is to predict in advance before the disaster happens, so that you have more time to prepare, such as weather forecast, so that you can know in advance that heavy rain or strong wind is coming and take precautions. And early warning means that when a disaster happens, it will be quickly transmitted to the areas that may be affected, winning a few seconds and minutes.

Earthquakes are difficult to predict because they will happen. Earthquakes are the result of crustal plate movement. When the crust rocks are broken or dislocated, huge energy is released instantly, and this energy propagates outward in the form of waves, which is seismic wave. Underground, the movement of crustal faults occurs almost all the time, and many movements are carried out at the same time. It is difficult to accurately monitor and distinguish these movements at present.

? The energy generated by an earthquake propagates outward through seismic waves, which are divided into shear waves and longitudinal waves. There are differences in velocity and amplitude between shear wave and longitudinal wave. Longitudinal wave propagates by extrusion with high speed and small vibration, while shear wave propagates by extrusion. Compared with longitudinal waves, shear waves are slower in speed and larger in amplitude. In fact, it is shear waves that do harm to human beings. Please click to enter a picture description.

The destructive power of earthquake is transmitted by seismic waves, which takes time, so there is an early warning. When an earthquake occurs, longitudinal waves with small amplitude will be detected first, and short-term early warning can be realized in the central area of the earthquake. The warning time will range from a few seconds to dozens of seconds.

On June 1 day 17, an earthquake of magnitude 6. 1 occurred in Lushan County, Ya 'an City, Sichuan Province. Three minutes later, a 4.5-magnitude earthquake struck Baoxing County, Ya 'an City. According to China Seismological Network, the first report, the second report, the third report, the fourth report and the fifth report released by China Earthquake Warning Network respectively provided earthquake warning time ranging from several seconds to tens of seconds near the epicenter.

Earthquake early warning is still not perfect, but it is also an effective disaster reduction technology. As long as the information is received, people can take emergency actions to avoid risks and protect their lives, and emergency treatment of related equipment and facilities can prevent the occurrence of secondary disasters and minimize casualties and economic losses.

Of course, comprehensive and effective disaster reduction cannot rely solely on earthquake early warning. The collapse of houses in the earthquake is the main cause of casualties. If the house is built firmly, it won't hurt human beings. Mastering scientific escape and avoidance methods can increase the chances of dangerous survival.