The people tagging this story with "correlation is not causation" are a perfect example of what Slate is talking about this week on how silly this meme has become. Ok, so are you saying that the frakking does not cause the earthquakes? What, is it the other way around? No, I'm guessing it's a mythical third factor causing both. Some mystery force is causing both the frakking and the earthquakes. Maybe birds. Who knows? But nothing something correlated!
People, the correlation thing is nice and all, but can we please not forget Occam's rasor? The frakking causing the earthquakes really is the simplest explanation, digging out the correlation argument is just as logical as closing your eyes and singing la-la-la. Proving correlation does not prove causation, but it is a necessary step in doing so, not a logical no-no. Even the scientist quoted in the article is aware of the distinction. There is no "gotcha!" here.
Thank you, Slate. I really had not realized how silly this had become.