also: ジェイアラート
J-Alert; satellite-based early warning system
Japan's nationwide satellite-based system that instantly disseminates emergency information such as earthquakes, tsunamis, and missile threats to local authorities and the public.
See also: 全国瞬時警報システム
If the J-Alert sounds, please evacuate to a safe place immediately.
The government transmits emergency information via the J-Alert system.