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While a 6.1 magnitude earthquake sounds almost as strong as a 7.0 earthquake, the difference of the destructive power between the two is greater than an order of magnitude. Unlike temperature scales, in which units of increase are constant, the method used to measure earthquake magnitudes is logarithmic. What this generally means is that the amount of shaking at ground level caused by a 5.0 earthquake is 10 times less than that caused by a 6.0 earthquake and 100 times less of that caused by a 7.0 earthquake.
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Comment: For more information about the issue of Hydraulic Drilling read the following article from an editor at SOTT: Water For Oil: The Devil's Bargain For Natural Gas