... the effect fracking has of causing earthquakes. It was quite astonishing to learn there is fracking going on in CaliforniaI was surprised to read on Wikipedia the theory that the 1906 earthquake may have been caused by human activity as well! (The weight of the sediment deposited in the bay from hydraulic mining shifted the forces around, causing an unusually large number of smaller earthquakes up to and including the big famous one). I don't really know how to evaluate how well accepted or controversial this theory is, and I can only get at the abstract of the cited article, but it's definitely an interesting idea.
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posted by supermedusa at 11:16 AM on March 19, 2012 [2 favorites]