Scientists say Midwest quakes poorly understood

(AP) -- Scientists say they know far too little about Midwestern seismic zones like the one that rumbled to life under southern Illinois Friday morning, but some of what they do know is unnerving.

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<p><a href="http://www.physorg.com/news127823426.html">Scientists say Midwest quakes poorly understood</a></p> <p>(AP) -- Scientists say they know far too little about Midwestern seismic zones like the one that rumbled to life under southern Illinois Friday morning, but some of what they do know is unnerving.</p>