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U.S. CRATON (FAULT LINE) QUAKES
#1 -- North American Craton Continental Crust
http://www.dutchsinse.com/blog/wp-content/uploads/2011/08/US_craton_quakes.jpg
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#2 -- Craton Rumbles from August 10 through the 24th.
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#3 -- Craton Rumbles from August 10 through the 24Th, with outline of the Craton Continental Crust.
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#4 -- Aug. 10 through the 24th, showing earth view of quakes, USGS, 3D view