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Originally Posted by ZenGum
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To make this clear, it isn't the fracking itself that causes an increase in pore pressure (the mechanism that can increase the probability of a quake) but the injection of fracking wastewater back into the Earth. Any seismic activity due to the actual hyraulic fracturing is minimal in comparison. This is not strong evidence against fracking but does hint that we need to be more wary of this particular method of wastewater disposal.
On a side note, this mechanism is actually well known within the geotech community and is a big problem for deep geothermal energy and CO2 sequestration since both involve raising the pore pressure at depth, possibly along fault lines.