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　　What is earthquake warning?

　　Earthquake warning is a time difference. When an earthquake occurs, it will produce longitudinal waves and shear waves, which are fast and have little destructive power. The shear wave is slow and destructive. When the seismic station captures the longitudinal wave signal, it will transmit the information such as the epicenter location and magnitude to the early warning terminal through the faster electromagnetic wave, so that it can win the emergency hedging time of several seconds to dozens of seconds for the surrounding cities before the arrival of the shear wave.

　　How to set up the national earthquake early warning applet

　　Is early warning useful?

　　Useful! According to the research, warning 3 seconds in advance can reduce casualties by 14%, while warning 20 seconds in advance can reduce casualties by 63%. (Data source: Research Report of Journal of Northwest Seismology in 2002) In just a few seconds to tens of seconds, chemical factories and nuclear power plants can turn off electromagnetic valves or shut down reactors, running high-speed trains and trains can brake urgently, residents on low floors can evacuate to the outside of the building, and residents on high floors can avoid to solid objects.

　　When will I receive the earthquake warning information?

　　During the public test, the release strategy is to release the early warning magnitude M≥4.0 in key areas of the country.

　　In terms of response strategy, when the estimated intensity of concern is less than 2 degrees, the early warning information is only displayed on the homepage of the applet, and the user is not reminded.

　　When the predicted intensity of the user’s concern is more than or equal to 2 degrees, receive the real-time warning information reminder through "service notification".

　　When the estimated intensity of the concerned area is ≥5 degrees, even if the mobile phone is in the off-screen state, it will still force an alarm sound. (The strong earthquake warning reminder received by Android system is shown in the figure below)

　　-Tuyuan China Seismological Network Center