NHK and other open television channels

The alerts issued on the different signals of the public broadcaster NHK[12]​ and other television channels,[13]​[14]​[15]​[16]​ consist of an information window that appears on the screen that shows the epicenter of the earthquake and the areas most vulnerable to the tremor. At the same time two sets of bells ring, followed by a voice announcing:

The alert also informs viewers whether or not there is a risk of landslides or tsunami caused by the earthquake in the affected area. If tsunami warnings are issued, the warning system interrupts all radio and television signals in the warning areas in tune with NHK at the time the system is activated, so the warnings are received correctly. All notices are issued in five languages: English, Mandarin, Korean and Portuguese (small populations in Japan speak these languages), as well as Japanese. These warnings were issued by NHK[17]​ and other Japanese television channels[18][19]​ during the earthquake and subsequent tsunami that affected the Japanese coast in 2011.

Mobile phone networks

Three major cellular telephone operators in Japan have developed simultaneous transmission systems based on cell broadcasting to receive and provide registered phones with a text message alerting them of an earthquake; this service has been provided since 2007.[20]​[21][22]​.

3G mobile telephony in Japan has been required to subscribe to the early warning system since 2007, however, overseas manufacturers (Nokia, Apple, HTC, LG, Samsung, etc.) are not compatible with the system. In August 2011, Apple announced that its iPhone iOS 5 platform will support early warning notification.[23]​.

radio receivers

Radio receivers transmit on FM frequencies, the same sound that alerts viewers, in case the station's signal is off the air, the system is automatically detected and the radio is turned on, this usually occurs during the nights in which a ring tone sounds and the message exhorting people to wake up and protect themselves from the earthquake, even under the bed. Seconds after the system is activated, it locates the epicenter and the areas in danger and transmits them automatically.[24][25]​.

The quality of the alert arrival may vary from one station to another.[26]​.

Cable TV

Some cable television stations offer early warning service, one of them is Japan Cablenet") (JCN), which rents a receiver that receives and alerts advanced users and notifies the user near the epicenter with a maximum of 5 seconds before the earthquake.[27]​[28]​ Other television stations transmit the alerts via television and FM radio frequency only in danger zones for free.

Internet

Weathernews Inc.), a weather information company, created a program that provides an advanced alert service to users who purchase The Last 10-Second" program for individuals and businesses on October 15, 2007.[29][30][31]​.

This service requires a computer with Windows 2000 or higher, and a permanent Internet connection. The program offers an affordable alternative to staying up to date with early warnings issued by the Japan Meteorological Agency. The application installed on the computer can be configured to receive information about all earthquakes with a magnitude of 3.5 Richter or higher, or with a seismic intensity of 3 or higher. New versions of the program allow the announcement of earthquakes of lower intensity. When a warning is issued, the program will announce the approximate location of the epicenter, the seismic intensity expected by the Meteorological Agency and a countdown of how long it will take until the main tremor reaches the user's location.

After the 2011 earthquake, Strategy Corporation (ストラテジー株式会社") created a similar freely available program called SignalNow Express.[32]​.