The 7.4 magnitude earthquake that hit northeastern Japan late Wednesday shook a region that’s still recovering from the devastation of the Great East Japan Earthquake and the ensuing tsunami and nuclear disaster.

But were the two quakes related? And if not, was this temblor a foreshock that could portend an even larger earthquake in the near future, as was the case when a 7.2 magnitude quake struck the Tohoku region two days ahead of the mega-quake on March 11, 2011?

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