Japan actually has an early earthquake warning system while the alerts only give a few seconds warning its enough to prepare you for it.
This afternoon at 4:56 Japan time there earthquake warning system goes into effect telling people to prepare for a large earthquake except:
Japan’s Meteorological Agency says it is investigating after it issued an alert for a very strong earthquake that turned out to be only a mild shake.
Loud alarms rang from cell phones and TVs just before 5 p.m. on Thursday, warning of an earthquake of magnitude 7.8, which could cause severe damage. It said residents throughout Japan should be prepared for a jolt.
A few minutes later the Meteorological Agency reported a magnitude 2.3 quake centered in Wakayama Prefecture, in western Japan. Under the Japanese system for measuring quakes, it barely registered.
Broadcaster NHK said the agency blamed electronic noise for triggering the apparently false alarm. The alert caused a brief halt of high-speed train services.
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