Because of fears of a large earthquake hitting the Tokyo region, the metropolitan government’s disaster vulnerability survey released Monday may warrant a close look.

More than seven decades have passed since the 1923 Great Kanto Earthquake struck, and concerns persist about when the next Big One will hit. The metro survey rated areas in Tokyo according to the risk of damage in the event of a large quake. It considered five key factors: ground conditions; durability of structures; risk of postquake fires; risks to residents such as from falling objects and collapsing buildings; and evacuation routes and shelter areas.

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