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The New Yorker has a detailed, well-researched article on how the process used for the disposal of waste water from fracking operations in the Mid-West is likely causing a profusion of man-made earthquakes. Oklahoma, the main focus of the article, has gone from having less than a handful of noticeable tremors a year to having them on a daily basis. This has rocketed the state well past California in the number of quakes of magnitude 3.0 and above, in a year. While most are minor quakes, some are severe enough to destroy structures and do millions of dollars worth of damage. http://www.newyorker.com/magazine/2015/04/13/weather-underground