Japan issues its first 'megaquake' warning after powerful tremor

An earthquake off Kyushu led Japan to issue its first megaquake warning for the Nankai trough. Prime Minister Fumio Kishida canceled a trip, and precautionary measures included slowing bullet trains and closing factories and beaches. The Nankai trough quake risk surpasses the 2011 disaster. Authorities urged preparedness without immediate evacuation.
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