Did Wenchuan TV warn in advance?

The TV program that is being ** has become a warning screen with white words on a blue background, and the countdown is starting from more than 40 seconds. When the countdown was about 38 seconds, the chandelier on the roof of the house where the photographer was located began to shake slightly.

A staff member said that this is a set of **alarm system that has been launched in the last two or three years, and once it happens**, if the magnitude of the earthquake is large, the warning will be activated. "We can already feel it, and when it happens, the system reacts." ”

Subsequently, Wenchuan County TV Station, a staff member of the editor-in-chief office said that this is the "** precursor emergency system" jointly developed by the Sichuan Provincial ** Bureau and ** Office, in the non-epicenter area, it can issue an alarm dozens of seconds in advance to remind everyone to evacuate urgently, but the system will not work in the epicenter.

The system is connected to the TV digital terminal in Wenchuan County, and once it happens**, the TV signal will be automatically cut off, and an alarm will be issued to remind citizens to evacuate. The system displays a countdown on the TV screen, "the signal and sound are stable", and when the countdown is over, it switches back to the original TV screen.

In addition to Wenchuan County, many places in Sichuan Province have also activated early warning systems. Wang Jun, director of the Sichuan Provincial Key Laboratory of Early Warning and director of the Chengdu High-tech Disaster Reduction Research Institute, told the Beijing News that 11 schools in six cities, including Guangyuan City, Chengdu City, Mianyang City, Aba City, Longnan City in Gansu Province and Hanzhong City in Shaanxi Province, issued early warnings 5 seconds to 38 seconds in advance. It also released the first warning information through nearly 20 government microblogs, including Sichuan Science and Technology, and also gave early warnings for the National Disaster Reduction Center and the National Early Warning Information Release Center.

The National ** Bureau denied concealing the early warning, saying that **Forecast is a world problem*** The press office held a press conference on the afternoon of the 13th, and Zhang Hong, spokesman of the China ** Bureau, made the following speech: **** is a world problem, why? There are three main factors:

The first is the inaccessibility of the earth, so the changes that occur in the underground can only be inferred through the observation of the surface; The second is the complexity of the pregnancy law. In different geographical tectonic environments and different time stages, the ** of different magnitudes will show quite complex pregnancy rhythm processes; The third is the small probability of ** occurring. It happens every year in the world, but for a region, the recurrence time is very long, and when scientific research is conducted, there are statistical samples.

And the acquisition of this sample is very difficult in a lifetime. Therefore, the above three reasons determine that the forecast is still a problem in the world. Forecasting, the primary problem studied and solved so far, including the relationship between observed phenomena and abnormal phenomena, is the focus of research.

If this relationship is studied clearly, the research will go to a higher level. But now we are encountering this problem, the relationship is not very clear, but it is not so unclear that we have not done anything at all. In the past 20 years, we have also noticed more than 20 times, and some of them have also achieved disaster reduction results, but this proportion is very low, so this forecast is very difficult, and the forecast has not passed.

Because every time, the phenomenon is very complex. The metrics we have identified may have changed in another place, for another period of time.

Late at night on July 14th. Wenchuan County, Sichuan Province has a level of **, this news makes people all over the country very worried about local security issues, because the Wenchuan ** has caused an indelible shadow on the psychology of the Chinese people. Fortunately, so far, Wenchuan has not posed any major threat.

This time, Chengdu City, Sichuan Province, received an early warning message 19 seconds before the arrival of the **wave.

Local residents fled in time. Many people in Wenchuan are blind. Mobile phones have received ** warnings.

Ms. Chen, a resident of Yingxiu Town, Wenchuan County, said that when it happened, the chandelier at home was shaking significantly, and residents hurriedly wore slippers to take shelter downstairs. The whole house was shaking, and I was the first to put it. Doors and lights are turned on without necessarily preparation.

I have to say that the local residents have a good sense of risk avoidance, and they can react to protect themselves at the first time, which is gratifying. <>

A local verification of the damage situation was carried out. After the Wenchuan-level ** occurred on July 14, Sichuan has begun to carry out disaster verification. The Aba Fire and Rescue Detachment has dispatched 10 people from a full-time team from Shuimo Town to the epicenter to verify the disaster.

At the same time, the local rescue fire brigade is ready to standby. At present, there are no reports of house collapse or personnel **, this time the traffic water and electricity. Nothing out of the ordinary.

As of the early morning of the 15th, there was still no report of personnel **, and there was no news that the house collapsed and people were trapped. <>

The aftershocks of Wenchuan will last for hundreds of years. According to the research of China's ** Taiwan Network Center. After the occurrence of large ** with the passage of time.

Yes. There will be aftershocks, but the intensity will slowly decrease. However, it will take a long time to reduce the intensity before the Wenchuan Massacre in 2008, and the evolution of nature is very slow.

Such aftershocks are also relatively normal. <>

I received an early warning in advance, but it was only about 19 seconds, and it is still very useful to see that there is no ** situation at present.

Of course received it in advance. Received an early warning of ** 19 seconds ago.

The first thing we need to know is that the generated waves are divided into transverse waves, longitudinal waves, and surface waves, which have different destructive and different speeds.

Here's one of our explanations of the wave:When it occurs, it will produce waves, including longitudinal waves, transverse waves and surface waves, the longitudinal wave propagation speed is about kilometers per second, and the transverse wave propagation speed is about kilometers per second, and the main damage is the transverse wave and surface wave, so after the detection instrument captures the wave, it can send an early warning to the surrounding area. Therefore, we will receive an early warning message before the transverse wave arrives.

However, there are still blind spots in the current early warning technology, because in the most destructive area of the epicenter, the first wave will reach the ground in an instant, and the detection instrument will not have time to warn. According to the current level of early warning technology, the radius of the epicenter is still a blind spot within a radius of 20 to 30 kilometers. At the same time, the early warning has little effect on the relatively low magnitude, but it is more important for the safety of some lifeline projects when it occurs, such as the city's power facilities, gas pipeline network, nuclear power plants, high-speed railways, etc., and can be used to use the early warning to make early shutdown and braking before the wave arrives to reduce the damage.

It is understoodThe system is connected to the local TV digital terminal in Wenchuan CountyBefore the occurrence, the early warning center releases early warning information in advance through the TV side, the TV signal will be automatically cut off, and the countdown seconds on the TV screen are constantly decreasing, with the digital broadcast of the human voice. After the sound number reaches 0, the alarm sounds on the TV.

Therefore, the system still has a very important role! And it's also very easy to use!

Because the ** bureau has a premonition that it will happen** in advance, it is said to be warned in advance.

This is because Wenchuan is at the junction of the crust of the banlu, so he has a lot of precautions.

The biggest reason is that they are detected by some instruments, so they can be said to be like this.

This is because the situation in Wenchuan is very advanced, and he can ****.

Because Wenchuan has suffered from the most advanced disasters before, it will pay special attention to this aspect of the problem

It should be fake, there is nothing that can be done at the moment, it can be ****.

Being able to broadcast ** early warning is mainly related to official research technology.

I think it's because they've been through it before, so it's okay to do this.