0 January 8, magnitude 6.9 earthquake occurred in Menyuan County, Haibei Prefecture, Qinghai. In less than 20 minutes, aftershocks occurred one after another. Not only Qinghai, but also the entire Shaanxi, Gansu and Ningxia also felt strongly.
Many people are "wake up" in their sleep, which means that the energy released by this earthquake is still quite large.
It can be said that people within a range of 100 kilometers have felt different degrees of shock.
If we divide it according to the earthquake rating, the earthquake rating is divided into magnitude 9:
will feel a little bit if it is above magnitude 2.5.
can be felt within the range of level 4.5, but generally it will not cause life danger or major damage. This range of
is greater than 4.5 and less than 6, and becomes a medium earthquake, and some things will fall.
6~7, it is called a strong earthquake. If
is greater than magnitude 7 and less than magnitude 8, it is called a major earthquake.
This earthquake in Qinghai is a strong magnitude, but magnitude attenuates very quickly, and the number of aftershocks did not last for too long. This is a good thing. After the
earthquake, will there be "safety risks" in the shaking buildings?
Most of the people live in buildings nowadays, and some residential areas belong to "high-rise buildings". When earthquakes come, the taller the buildings shaking the more severely, especially those buildings with separate columns that are not connected to each other, and may even make a "rattle" breaking sound.
So there is a very worrying question here, is there a potential security crisis in the building that sways violently after the earthquake stops?
This requires considering the design problem of an architectural. As long as it is not a "scrap" building, will have components of "ductile design".
ductility design means that is installed in some less important positions to use a series of components with low strength but strong deformation capabilities!
When a major earthquake occurs, these components will deform, absorbing a large amount of earthquake energy during its own deformation, thereby reducing the damage caused by the earthquake to other parts of the building, sacrificing oneself, and preserving the entire building.
After the earthquake, although the building has undergone great deformation, it will not collapse, and the people in the building can be evacuated quickly. If the main structure of the building is not damaged after the inspection, the building can be put back into use after replacing these broken components.
If it is a super high-rise building with dozens of floors, there will be more "hard core design", that is " damper "!
The so-called damper is usually a large steel ball hanging on the roof of a building. The most familiar damper is the one for people to visit on the roof of Taipei 101 Building.
These large steel balls usually weigh more than 500 tons. They are balls, but in fact they are huge metal blocks of approximately spherical shapes welded with many thick steel plates. If they fall down, they will make the entire building cool from head to toe. But don't worry, the steel wires that hold them are extremely strong, ten times the strength of ordinary steel. Even if a few are broken, the rest will be enough to hold the steel ball.
When an earthquake occurs, the building may involuntarily shake to one end, while the large steel ball stays in place due to inertia. This way, the building will be held and let it sway. This is equivalent to applying huge damping to the vibration of the building, and the name of the "damper" is derived from it.
Some building designers think it would be a pity to hold such a heavy and useless big steel ball, so they replaced the big steel ball with an equal weight fire water tank , which is equivalent to the two-in-one version of damping effect and water tank utilization.
Finally, I have to add, please believe that our construction engineers need to build dense buildings after dense building in places with a large population, and all kinds of preliminary explorations are required. If your house is built in places where earthquakes occur frequently or there may be a strong earthquake, it will hardly appear.
The level of Chinese science and technology and Chinese architects has developed to this day. Unless there is an unimaginable disaster situation, you will not be allowed to live in danger.
The earthquake occurred in Qinghai in the early morning. As I wrote this, it was already past 5 o'clock. In another 2 hours, the sky in Liaoning will be almost dawn. It is estimated that all the powerful rescue units in Qinghai have rushed to the earthquake site. I wish everyone within the earthquake source can be safe!
#Qinghai earthquake# #Qinghai Haibei 6.9 magnitude earthquake with strong Yinchuan# #Qinghai Haibei 6.9 magnitude earthquake with strong northwest#
