J-Alert (全国瞬時警報システム, Zenkoku Shunji Keihō System?) is a nationwide warning system in Japan launched in February 2007. It is designed to quickly inform the public of various threats. The system was developed in the hope that early warnings would speed up evacuation times and help coordinate emergency response.
Read more about J-Alert: The System, Information Able To Be Transmitted By This System, Adoption Rate