When one thinks of earthquakes, the Mississippi river valley (MRV), does not frequently come to mind. One usually thinks of one of California's numerous faults or somewhere in Alaska. However, little known to the general public, there were two massive earthquakes in the MRV, which rank among the top three in the contiguous United States and in the top ten for the entire United States (http://wwwneic. cr.usgs.gov/neis/eqlists/bigten.lis). Starting …
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