“The natural gas boom that transformed the energy picture in the United States in the last decade is still in its infancy, says John Shaw, chair of Harvard’s Earth and Planetary Sciences Department. . .
Fracking is probably not a direct cause of associated earthquakes, Shaw said, noting that the pressure to fracture the rock is applied for only minutes and is followed by the gas flowing from the rock into the borehole, which actually lowers the pressure in the surrounding rock. Instead, Shaw said, it is the disposal, by injection into the earth, of the ample waste liquid the process generates that is largely responsible for generating quakes. Some firms are now looking at recycling wastewater as an alternative.”
There are those who see fracking as a threat to renewable energy sources where they are either financially or emotionally invested. In my opinion, that is behind many of the scare stories.
http://news.harvard.edu/gazette/story/2015/03/staying-power-for-shale-gas/
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