Japan warns of slightly increased risk of mega-quake after a 7.7-magnitude one

A 7.7-magnitude earthquake off northern Japan prompted a tsunami alert and a 1% risk advisory for a mega-quake in the next week. The Japan Meteorological Agency and Cabinet Office urged residents to prepare, while Prime Minister Sanae Takaichi emphasized emergency readiness. The quake, near the Chishima and Japan trenches, caused minor tsunamis but no major damage, echoing concerns from the 2011 disaster.