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Did Fracking Cause Recent Oklahoma Earthquakes?
Hugh Pickens writes writes "Oklahoma is typically seismically stable, with about 50 small quakes a year — but in 2009, that number jumped up to more than 1,000 and on November 5 a 5.6-magnitude tremor rattled Oklahoma — one of the strongest to ever hit the state — leading scientists to wonder if the increasingly common use of fracking, the controversial practice of blasting underground rock formations with high-pressure water, sand, and chemicals to extract natural gas, may have put stress on fault lines. Human intervention has caused earthquakes before with one 'textbook case' occurring in 1967 in India, says Peter Fairley at IEEE Spectrum, when the reservoir behind the hydroelectric Koyna Dam was filled up. The added water 'unleashed a magnitude 6.3 quake' by placing stress 'on a previously unknown fault, killing 180 people and leaving thousands homeless.' Last week's earthquakes and aftershocks are centered in rural Lincoln County, in an area about 30 miles east of Oklahoma City and there are 181 injection wells In Lincoln County. But a recent study by Austin Holland, a seismologist with the Oklahoma Geological Survey, says that it's possible that hydraulic fracking caused a series of small earthquakes, peaking at 2.8, in an area south of Oklahoma City but doesn't believe fracking caused the big Nov. 5, 6 and 8 earthquakes comparing a man-made earthquake to a mosquito bite. 'It's really quite inconsequential,' says Holland."
While we're at it, let's have more data about which chemicals are being injected. They will eventually turn up in the water table through Murphy's law.
Beta is broken and the link to classic doesn't work. Stop wasting our time or there won't be anybody left here.
It seems a lot of people aren't RTF(ull)A...
The only scientist to say what the summary indicates has said that Frakking wasn't the cause of the *Big earthquake they had. He even admits it was possibly at fault for the many small earthquakes that have plagued the area in the past couple years. Also: most of the scientists who are investigating the big earthquake (as well as the small ones) are pointing more to the high pressure injection well process that is used to dispose of the waste fluids from frakking than the frakking itself. They have seen this process be responsible for large tremors in the past and so are investigating the possibility here. Note: They have not claimed fault yet. They are in the middle of what could be a very long (years) investigation as to the true cause of the tremors. They have only mentioned that the severe increase in small tremors and this extremely rare large tremor may be the result of the recent increase/presence of frakking and injection well activity near the faults.
There is also scientific evidence that the fracking itself causes earthquakes, but nothing of the size of what happened in Oklahoma last weekend. A recent study by seismologist Austin Holland, a seismologist with the Oklahoma Geological Survey, said that it’s possible that hydraulic fracking caused a series of small earthquakes, peaking at 2.8, in an area south of Oklahoma City earlier this year. When lots of liquid is injected into the ground it changes the stress and pressure in a place that probably already was a fault, Holland said. It’s similar to injecting water between two adjacent bricks, it allows them to slide more easily and "the water under pressure is helping push the bricks apart ever so slightly," Holland said.
But Holland doesn’t believe fracking caused the big Nov. 5, 6 and 8 earthquakes. He compared a man-made earthquake to a mosquito bite.
Bad Summary on both the /. side and the original article. The real information is so much more interesting.