How does Japan's "Emergency Earthquake Rapid Reporting System" issue earthquake warning?

Emergency earthquake quick report is an alarm issued by Japan after an earthquake is detected, which is issued by the Japan Meteorological Agency as the center. The Japan Meteorological Agency publishes two types of quick reports: one for advanced users (called "forecast", but not earthquake prediction) and the other for the public (called "alarm").

How to release TV "Meteorological Law" stipulates that once the Meteorological Agency issues an earthquake warning, it must immediately notify NHK, and NHK must immediately broadcast the warning.

On June, 2007, NHK began to release emergency earthquake reports on TV, FM and AM bands. In the NHK TV channel, when the prompt tone (bell) rings, the hourly report will be superimposed on the TV screen, and then the voice of NHK announcer Masao Motoda will be played: "Emergency earthquake quick report, please pay attention to strong shaking." Then NHK will insert earthquake-related news. If the program being broadcast is a live program, the original content will be temporarily interrupted, and the host will remind the audience how to avoid risks and "please pay attention to the tsunami for safety" and other information. If the Meteorological Agency issues a tsunami warning, it will broadcast an emergency warning. In addition, the prompt tone of NHK emergency earthquake report is protected by copyright, and any unit or individual needs to be authorized to use it.

Other TV stations have similar alarms. Some TV stations use the prompt sound of NHK to report the emergency earthquake quickly.

The mobile phone networks of NTT DoCoMo, au and Softbank, the three major mobile phone operators in Japan, began to provide emergency earthquake quick report service in 2007. After 2007, Japanese manufacturers must support this function in 3G mobile phones on the market. However, since this news quick report function was first created in Japan (news is expanded from mobile phone broadcasting instead of ordinary SMS), the mobile phones sold and roamed by overseas manufacturers in Japan did not support it at first, so Apple added the emergency earthquake quick report function to the iOS 5.0 and above operating systems of the iPhone sold in Japan. In recent years, most Android smartphones sold by operators in Japan also have this function built in. Other smartphones can also add this feature by installing an App. This service is free. It is enabled by default in new mobile phones, and users cannot turn it off. And in order to avoid confusion, the alarm sound of the alarm is fixed, and users are not allowed to modify it themselves.

Cable TV Japan Cable TV provides EEW service at a reasonable price. For example, Japan Cable Television (JCN) rents a receiver that can receive EEW to advanced users, which can inform users of the intensity of the earthquake and the estimated arrival time. Some cable TV stations also broadcast EEW through FM radio and provide free equipment to local public organizations.