Why do Beijing citizens receive earthquake warnings during the Shandong earthquake? Why do warning contents vary in different regions? Introduction | Earthquake | Warning

At 2:33 am on August 6th, a 5.5 magnitude earthquake occurred in Pingyuan County, Dezhou City, Shandong Province, and most areas of Beijing were also felt. After the earthquake, many citizens received warning reminders on their mobile phones regarding the arrival time and distance from the epicenter of the earthquake shear wave. Why did you receive such a message? Why do different regions receive different content? How should we take emergency shelter after receiving it?

According to the Beijing Seismological Bureau, in fact, earthquake warning is not earthquake prediction, but an alarm. Received a warning message indicating that an earthquake has occurred. It refers to the rapid issuance of a danger warning to areas where destructive seismic waves have not yet reached after an earthquake, usually only a few seconds to a few tens of seconds, mainly to fight for emergency response and evacuation time for some special industries and the public.

Specifically, when an earthquake occurs, two main types of seismic waves are generated: longitudinal waves with faster velocity but weaker vibration, and transverse waves with slower velocity but greater vibration. Earthquake warning is the use of the principle that longitudinal waves propagate faster than transverse waves, and electromagnetic waves propagate much faster than seismic waves. After an earthquake occurs, longitudinal waves are captured by seismometers near the epicenter, and seismic wave information is used to quickly calculate earthquake parameters and impact levels. Before the arrival of more destructive transverse waves, earthquake warnings are issued to areas that may be damaged and affected.

The reporter learned that the construction of the earthquake warning network in the Beijing Tianjin Hebei region has been completed. After a destructive earthquake occurs, the China Earthquake Warning Network will release earthquake warning information through various channels such as emergency broadcasting, mobile phones, television, and dedicated terminals, providing users in the target area with a warning time of several seconds to tens of seconds for emergency evacuation.

However, earthquake warning also has limitations.

After the earthquake this morning, many Beijing residents received warning messages, but the warning content for residents living in different areas is not the same, especially the displayed arrival time of earthquake shear waves and distance time from the epicenter are different. The reporter learned that the length of earthquake warning time depends on the distance between the area and the epicenter, and the closer the area is to the epicenter, the shorter the warning time. In general, near the epicenter, the time to provide warning is almost zero, indicating the existence of a warning blind spot.

What magnitude of earthquake in the Beijing area will trigger earthquake warnings? The Beijing Earthquake Observatory previously introduced that if an earthquake of magnitude 4 or intensity 5 or above occurs in Beijing, earthquake warning information will be issued. After receiving it, the general public must remain calm and composed, correctly identify the earthquake warning information through pictures, light alarms, sound alarms, voice prompts, etc., and take corresponding risk avoidance measures in combination with the environment.

Red warning, there is a destructive earthquake occurring, and the estimated intensity of the warning terminal location reaches 7 degrees or above, requiring emergency evacuation measures. Orange warning, the estimated intensity of the location of the warning terminal is 5 or 6 degrees, which may cause strong tremors and require appropriate shock absorption. Please take appropriate risk avoidance measures based on your environment and remember the correct shock absorption posture: lying on the ground, covering, and holding firmly. Once an earthquake occurs, do not panic and immediately seek refuge nearby.

The Beijing Municipal Seismological Bureau also issued a reminder this morning. After preliminary analysis and judgment, this earthquake will not have a significant impact on short-term seismic activity in the Beijing area, and there have been no obvious short-term earthquake anomalies in the Beijing area recently.

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How do mobile phones receive earthquake warnings?

At 2:33 am on August 6th, a 5.5 magnitude earthquake occurred in Pingyuan County, Dezhou City, Shandong Province, and many netizens reported receiving earthquake warnings.

The earthquake warning function is very important. In emergency situations, this one minute early warning provides us with valuable time for emergency evacuation. So, how do I set earthquake warnings on my phone? For different phone models, you can refer to the following methods to prevent accidents in just ten seconds. Please turn on the earthquake warning function! Hope everyone is safe!

On the 6th, the topic # Apple earthquake warning # made it to the hot search on Weibo. A netizen found that "Apple, a big mobile phone company, surprisingly does not have such an important earthquake warning function.".

A netizen who took a screenshot and didn't receive an earthquake warning joked, "My phone sleeps even worse than me.".

Screenshots and netizens shared how Apple users set earthquake warnings.

What model is your phone in the screenshot? Have you received the earthquake warning?