How did Japan react to the false quake alarm?

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SUMMARY

The false earthquake alarm in Japan, described as “probably the biggest” misreading since the system's inception in October 2007, was attributed to electrical noise on the ocean floor, according to Toshio Kusano from the Office of Earthquake and Tsunami Disaster Prevention. The incident sparked widespread rumors on social media regarding its causes, including theories involving lightning, Godzilla, and congestion from the Pokémon Go game. Despite the chaos, no physical damage occurred, confirming the data was clearly false.

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False quake alarm: How Japan reacted to the ‘Big One’ that never was
The mistake was “probably the biggest” misreading since the system started in October 2007, said Toshio Kusano, a spokesman for the Office of Earthquake and Tsunami Disaster Prevention at the agency.

The glitch was caused by electrical noise on the ocean floor, he said.
...
Rumors circulated on social media about the possible causes, which included a lightning bolt, Godzilla and “Pokemon Go” congestion.
http://www.japantimes.co.jp/news/2016/08/01/national/false-quake-alarm-how-japan-reacted-to-the-big-one-that-never-was/#.V5_v0nUrIW1

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Clearly false data since nothing fell down anywhere.
I heard that some people are attributing the false data to internet lag arising from the new pokemon game.