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116:. 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.
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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
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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
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When there is a civil emergency such as a ballistic missile heading towards Japan, a special air raid siren sounds across loudspeakers and on TV and radio.
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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
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72:. J-Alert was launched in February 2007. The system is designed to quickly inform the public of threats and emergencies such as
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Guide on disaster prevention and mitigation effort during earthquakes and tsunamis
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404:"J-Alert: disaster warning technology in Japan – Centre for Public Impact"
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based system that allows authorities to quickly broadcast alerts to local
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580:"Japan stands by cancelled missile alert sent to millions of residents"
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Emergency warning of volcanic eruption and the possibility of eruption
549:"J-alert to serve as early warning system during weather emergencies"
488:"Disaster agency urges municipalities to upgrade J-Alert receivers"
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Earthquake prediction advisory information of the Tōkai earthquakes
345:, and the yearly maintenance is estimated to be around 10 million
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639:北朝鮮から発射された弾道ミサイルが日本に飛来する可能性がある場合における全国瞬時警報システム（Ｊアラート）による情報伝達について
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By May 2013, 99.6% of municipalities nationwide were covered.
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Warning of volcanic eruption and the possibility of eruption
520:[Tokyo Metropolitan Area Disaster Prevention Plan]
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Earthquake prediction information of the Tōkai earthquakes
432:"Japan Launches Alert System For Tsunamis And Missiles"
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Emergency warnings for heavy rain, heavy snow, gale,
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Protecting guide against Armed
Attacks or Terrorism
119:J-Alert broadcasts via both ground systems and the
64:, 'National Early Warning System') is the
325:Other information for civil and national defense
650:Ministry of Internal Affairs and Communications
634:Ministry of Internal Affairs and Communications
615:Ministry of Internal Affairs and Communications
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526:東京都防災 (Tokyo Disaster Prevention Information)
8:
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681:全国瞬時警報システム 実際の放送例 (J-Alert Demonstration)
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373:fired a new type of ballistic missile.
185:Earthquake prediction warning for the
179:of various areas, and the presence of
140:North Korean missile launch over Japan
138:Alert messages sent on 29 August 2017
798:Public Warning And Information System
252:Warnings for heavy rain, heavy snow,
164:, and precautions of possible tsunami
130:Information transmission capabilities
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887:Emergency population warning systems
666:Cabinet Secretariat Civil Protection
642:Cabinet Secretariat Civil Protection
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96:directly via a system of nationwide
630:Fire and Disaster Management Agency
611:Fire and Disaster Management Agency
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677:, warning of an imminent tsunami
829:Emergency Cell Broadcast System
547:Torres, Ida (31 October 2013).
494:. 7 August 2017. Archived from
61:Zenkoku Shunji Keihō Shisutemu
16:Japanese disaster alert system
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882:Emergency management in Japan
25:Diagram of the J-Alert system
892:2007 establishments in Japan
720:Emergency population warning
578:Kelly, Tim (13 April 2023).
528:(in Japanese). 17 April 2021
384:Emergency population warning
658:Japan Meteorological Agency
319:Information of large-scale
270:Information of the risk of
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792:Korean Public Alert System
293:Special emergency threats
860:UK Emergency Alert System
854:Wireless Emergency Alerts
736:National Messaging System
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408:CentreForPublicImpact.org
276:Advisory information for
123:communication satellite.
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37:
625:1 September 2017 at the
233:Volcanic crater forecast
152:Earthquake Early Warning
748:Alberta Emergency Alert
722:systems facilitated by
816:Emergency Alert System
810:Emergency Mobile Alert
675:2011 Tōhoku earthquake
647:全国瞬時警報システム（J-ALERT）の整備
492:The Japan Times Online
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848:Public Warning System
835:Public Warning System
553:The Japan Daily Press
336:Many prefectures and
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779:Emergency Alert Mail
468:on 18 September 2017
361:On 13 April 2023, a
66:early warning system
673:relayed during the
897:2007 introductions
298:ballistic missiles
284:violent heavy rain
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27:
869:
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750:(Alberta, Canada)
559:on 29 August 2017
498:on 30 August 2017
356:Notable instances
264:, and storm surge
249:, and storm surge
187:Tōkai earthquakes
156:Quick updates on
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862:(United Kingdom)
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773:National Message
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555:. Archived from
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267:Weather advisory
223:Volcano eruption
216:Tsunami advisory
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38:J－ALERT/Jアラート
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587:. Retrieved
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561:. Retrieved
557:the original
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530:. Retrieved
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363:North Korean
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121:Superbird-B3
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98:loudspeakers
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52:; full name
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838: [
819: [
800:(Lithuania)
782: [
763: [
742:Alert Ready
738:(Australia)
518:"東京都地域防災計画"
338:urban areas
177:intensities
74:earthquakes
876:Categories
456:"Ｊアラートの概要"
390:References
304:airstrikes
272:landslides
169:hypocenter
158:hypocenter
147:Earthquake
102:television
55:全国瞬時警報システム
754:LAT-Alert
563:29 August
502:29 August
472:29 August
437:29 August
413:29 August
371:Pyongyang
321:terrorism
310:guerrilla
258:snowstorm
243:snowstorm
173:magnitude
162:magnitude
86:satellite
43:romanized
844:(Taiwan)
825:(Norway)
804:NL-Alert
775:(Israel)
769:(France)
760:FR-Alert
744:(Canada)
623:Archived
532:17 April
378:See also
367:Hokkaido
341:million
94:citizens
68:used in
34:Japanese
794:(Korea)
788:(Japan)
756:(Chile)
726:service
684:YouTube
589:11 July
584:Reuters
316:attacks
278:tornado
200:Tsunami
181:tsunami
92:and to
49:J Arāto
45::
30:J-Alert
204:Major
112:, and
80:System
850:(UAE)
842:]
823:]
786:]
767:]
522:(PDF)
466:(PDF)
459:(PDF)
262:waves
247:waves
110:email
106:radio
90:media
70:Japan
856:(US)
591:2023
565:2017
534:2021
504:2017
474:2017
439:2017
415:2017
312:and
254:gale
347:yen
343:yen
878::
840:zh
821:no
784:ja
765:fr
632:,
613:,
582:.
551:.
524:.
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447:^
423:^
406:.
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58:,
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36::
712:e
705:t
698:v
593:.
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32:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
