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In some regions, the increase in earthquakes is even greater than six fold. For example, in Oklahoma over the past half-century, there were an average of 1.2 quakes of greater than 3.0 magnitude per year. Since 2009, there have been more than 25 per year. "A naturally-occurring rate change of this magnitude is unprecedented outside of volcanic settings or in the absence of a main shock, of which there were neither in this region," the scientists write. The conclusion that at least one environmental group has drawn from this data is that fracking, in one way or another, has caused these earthquakes. The Environmental Working Group notes that more than 400,000 wells were drilled between 2001 and 2010, a 65% increase over the previous ten-year period. They also note that the new extraction techniques require vast amounts of water to be injected into the ground: major producer Chesapeake estimates that it uses about 5 million gallons of water per well. Lots of wells plus lots of water injected underground could change the subterranean conditions and lead to more earthquakes.
The USGS scientists aren't willing to draw the causal connection between fracking and earthquakes. "While the seismicity rate changes described here are almost certainly manmade, it remains to be determined how they are related to either changes in extraction methodologies or the rate of oil and gas production," they conclude.
Originally posted by Feltrick
It does make sense that breaking up bedrock a mile or so below ground could cause earthquakes. They are making the ground unstable in order to reach a clean fuel source. It's time we started putting solar panels on homes. Check that, we should have done this years ago!
Originally posted by stanguilles7
reply to post by Hadrian
I'm pretty sure it's mostly ground water being pumped back into the ground. So while I'm sure it has consequences, its not like it water being taken from the air and injected into the ground.
Originally posted by noodlewrangler
If a fault is reactivated it won't slip, causing an earthquake, unless there is sufficient stress being carried across the fault. The midwest, which is the focus for many of these alleged "man made quakes" carries very little techtonic stress. That is the reason there are few large mountain ranges there.
Originally posted by noodlewrangler
The paper in question shows that earthquakes have increased ~25 fold in the last year which sounds staggering by itself. BUT, the timescales that are being talked about are very short. A century is less than the blink of an eye in geologic time. There are many other factors that could cause the quakes other than fracking. East west extension in the area could have increased, subsidence could be occoring due to depletion of the underlying aquifers.
Originally posted by noodlewrangler
Also, the water catching on fire has been reported since the 1800s in certain parts of the country. This shocking phenomenon is caused by natural seepage of gas from NATURAL fractures into the ground water. The fractures caused by fracking only propagate a few hundred feet out at most. Natural fractures can propagate miles up into the ground water.