Tsunami Warning (Japan)

Japan has a nationwide Tsunami Warning system (Japanese: 大津波警報・津波警報・津波注意報). The system usually issues warnings a few minutes after an Earthquake Early Warning (EEW) is issued, should waves be expected,^[1]^[2] usually when a combination of high magnitude, seaward epicenter and vertical focal mechanism is observed. The tsunami warning was issued within 3 minutes with the most serious rating on its warning scale during the 2011 Tōhoku earthquake and tsunami; it was rated as a "major tsunami", being at least 3 m (9.8 ft) high.^[2]^[3] An improved system was unveiled on March 7, 2013, following the 2011 disaster to better assess imminent tsunamis.^[4]^[5]

^ "Japan Meteorological Agency｜Flow of issuance of information about tsunami and earthquake". Retrieved 15 April 2016.
^ ^a ^b "80 Seconds of Warning for Tokyo". MIT Technology Review. Retrieved 15 April 2016.
^ "Emergency Warning System Starting Shortly" (PDF). Archived from the original (PDF) on 13 August 2013. Retrieved 15 April 2016.
^ "Leaflet "Start of New Tsunami Warning System Operation"" (PDF). Archived from the original (PDF) on 21 July 2014. Retrieved 15 April 2016.
^ "Tsunami two years on: Japan finally gets warning system that would have saved hundreds of lives". 9 March 2013. Retrieved 15 April 2016.

[1] "Japan Meteorological Agency｜Flow of issuance of information about tsunami and earthquake". Retrieved 15 April 2016.

[2011warning-2] "80 Seconds of Warning for Tokyo". MIT Technology Review. Retrieved 15 April 2016.

[3] "Emergency Warning System Starting Shortly" (PDF). Archived from the original (PDF) on 13 August 2013. Retrieved 15 April 2016.

[4] "Leaflet "Start of New Tsunami Warning System Operation"" (PDF). Archived from the original (PDF) on 21 July 2014. Retrieved 15 April 2016.

[5] "Tsunami two years on: Japan finally gets warning system that would have saved hundreds of lives". 9 March 2013. Retrieved 15 April 2016.

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