The earthquake in Luding County, Ganzi Prefecture, Sichuan Province touched people's hearts. Many media reported that before the earthquake, residents of Sichuan and Chongqing shared earthquake warnings on their mobile phones. The warning screenshot of one of the Chongqing netizens shows that "In 64 seconds, the earthquake horizontal wave arrived at Jiangbei District, Chongqing City, and the epicenter was Luding, Sichuan. The warning magnitude 26.9 is magnitude hiccup, and the tremor is strong." Many netizens are curious: Can earthquakes still be warned? Is the warning information accurate?
Shanghai Rumor Refuting Platform has been verified and screenshots of earthquake warning information on the Internet are from a mobile software called "Earthquake Warning". The developer is "Institute of Care-Life". The software shows that the APP's early warning capability is provided by Chengdu Hi-Tech Disaster Reduction Research Institute , supporting national earthquake warning for .
The software introduces that it will issue a countdown warning alert a few seconds to dozens of seconds before the earthquake causes damage, reminding users to avoid danger in time. When the earthquake wave reaches the local area, the phone will emit a whimpering alarm, prompting the user to avoid danger in a safe place.
In addition to the application software, many mobile phone brands also expressed their support for earthquake warning function. However, the reporter found that the earthquake warning areas provided by some mobile phone brands in are only limited to in Sichuan Province. For example, Huawei mobile shows the supported Sichuan area area for the pilot launch, and says that more warning areas will be gradually activated in the future.
So, is the earthquake warning information provided by these mobile phones and software accurate? What is their functional principle?
In the final analysis, earthquake warning is monitoring the earthquake wavelength , and then sending out early warning information.
According to China Earthquake Network , when an earthquake occurs, two body waves are generated inside the earth. One is P wave (compressed wave, particle vibration and propagation direction are the same), commonly known as earthquake longitudinal wave, people's feeling is close to up and down shaking when it arrives; the other is S wave (shear wave, particle vibration direction and propagation direction are vertical), commonly known as earthquake transverse wave, people's feeling is close to horizontal shaking when it arrives. The P wave runs fast, propagating about 6 kilometers per second, while the S wave runs slowly, propagating about 3.5 kilometers per second. S wave vibration carries several times to dozens of times the energy of P wave, and its horizontal shearing effect is an important factor in causing structural damage.
If the earthquake can inform the possible magnitude or potential damage of the earthquake in the form of an alarm before the S wave carrying more energy arrives, or even a few seconds before the P wave arrives, the public can obtain emergency escape and risk avoidance time, while high-speed rail, hazardous chemical companies, hospital operating rooms, etc. can take earthquake emergency response measures in advance, thereby reducing casualties and social property losses. The earthquake warning software and the earthquake warning function of the mobile phone are to inform users of the changes in the official seismic transverse waves and even longitudinal waves. Although the warning time will not be particularly long, these few dozen seconds ahead can also provide valuable time for emergency risk avoidance.
Shanghai Rumor Refuting Platform has also measured the earthquake warning activation methods of some brand mobile phones. The specific settings are as follows:
Huawei mobile phone: settings-safety-emergency warning notice-earthquake warning
Xiaomi mobile phone : mobile phone housekeeper-family care-earthquake warning
OPPO mobile phone : settings-safety-SOS emergency contact- natural disaster alarm - Earthquake Alarm
VIVO Mobile: Weather App-Settings-Earthquake Warning-Enable Earthquake Warning Service
Realme: Settings-Safety-SOS Emergency Contact-Natural Disaster Alarm-Earthquake Alarm
For mobile phones of Apple , Samsung and other brands, it is recommended that users download the "earthquake warning" software in the application market.
WeChat editor: Dengdeng
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