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Wikipedia / J-Alert

J-Alert (; full name ) is the early warning system used in Japan. J-Alert had first launched in Japan in February 2007.

The system is designed to quickly inform the public of threats and emergencies such as earthquakes, severe weather, and other dangers. The system was developed in the hope that early warnings would speed up evacuation times and help coordinate emergency response.

System

J-Alert is a satellite based system that allows authorities to quickly broadcast alerts to local media and to citizens directly via a system of nationwide loudspeakers, television, radio, email, and cell broadcastss. According to Japanese officials, it takes about one second to inform local officials, and between four and twenty seconds to relay the message to citizens. An enhanced version of the J-Alert receivers were installed by the end of March 2019. The new models can automatically process the information within two seconds, compared to the older models that can take up to twenty seconds.

J-Alert broadcasts via both ground systems and the Superbird-B3 communication satellite.

When there is a civil emergency such as a ballistic missile heading towards Japan, a siren called Civil Protection Siren sounds across loudspeakers.

Information transmission capabilities

Earthquake

Tsunami

Volcano eruption

  • Emergency warning of volcanic eruption and the possibility of eruption

  • Warning of volcanic eruption and the possibility of eruption

  • Volcanic crater forecast

Severe weather

Special emergency threats

Adoption rate

Many prefectures and urban areas were slow in adopting the system. Upon its introduction, the Japanese government hoped to have 80% of the country equipped with the J-Alert system by 2009. However, by 2011, only 36% of the nation had been covered. Cost had been a major factor; the initial installation is estimated to be around 430 million yen, and the yearly maintenance is estimated to be around 10 million yen.

By May 2013, 99.6% of municipalities nationwide were covered.

Notable instances

  • On 13 April 2023, a North Korean missile launch warning led residents to take cover from debris that most likely fell into the sea hundreds of miles away. The alert, just before 8 a.m., triggered sirens on Hokkaido and sent automated messages to mobile phones in J-Alert urging the northern island's more than five million residents to seek immediate shelter, after Pyongyang fired a new type of ballistic missile.

See also

References