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USGS: Glut of quakes likely manmade, fracking possible cause

Last year saw a sharp rise in 3.0-magnitude quakes or stronger in the U.S. midcontinent, a continuing trend that prompted the U.S. Geological Survey -- the government's main source for Earth sciences -- to investigate the root cause.

Monday - 04/16/2012, 02:51pm EDT

Tags: USGS, fracking, earthquake, quake, Bill Ellsworth, David J. Hayes,

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