A 4.2-magnitude Michigan earthquake: How did that happen? (+video) - dofaq.co
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A 4.2-magnitude Michigan earthquake: How did that happen? (+video)

Christian Science Monitor - 02 May 2015
But the lack of seismic activity, combined with the fact that the faults lie so deep beneath the surface, has meant that that such faults have been difficult to find or study. The 30 recorded Michigan quakes that have been related to fault movement had ...

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