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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. [4] J-Alert broadcasts via both ground systems and the Superbird-B3 communication satellite. [5] [better source needed]
The JMA announced the Earthquake Early Warning hit (accuracy) rate for the 2011 fiscal year on 31 May 2012. The hit rate is the percentage of warnings issued immediately on the detection of P-waves with a Japan Meteorological Agency seismic intensity scale (震度, shindo) number (0 to 7) within one shindo number of the measured earthquake.
An animation detailing how earthquake warning systems work: When P waves are detected, the readings are analyzed immediately, and, if needed, the warning information is distributed to advanced users and cell phones, radio, television, sirens, and PA systems/fire alarm systems before the arrival of S waves.
Some of these launches, including a missile that flew over Japan's southern islands on Aug. 24, have triggered Japan's J-Alert system which allows authorities to instantly send warnings via ...
Just 15 minutes to go until the alert goes off. Millions of people around the country can expect their phones to go off at 3pm. And as a reminder - it’s a test of the emergency alert system so ...
Japan said over its J-Alert broadcasting system that North Korea appeared to have fired a missile, sending out the warning to residents in the southern p North Korea launches suspected spy ...
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