Japan Trench re-locks, accumulating stress for potential megaquake and tsunami

The Japan Trench, source of the 2011 M9.0 Tohoku earthquake, has re-locked and is accumulating seismic tension, according to a translated report. The claim is based on scientific monitoring but lacks specific data or a timeline, so the imminence of a rupture is uncertain. This matters because a future megaquake there could generate a historic tsunami threatening northeastern Japan.

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