--- title: Oklahoma Earthquakes Raise Fracking Fears description: A normally calm state is hit by a wave of minor earthquakes—causing some to point the finger at fracking. But wastewater disposal wells likely play a bigger role canonical: https://time.com/8782/oklahoma-earthquakes-fracking-link/ author: Bryan Walsh article:opinion: false article:content_tier: free article:published_time: 2014-02-18T21:20:17.000Z article:modified_time: 2026-02-21T06:26:51.474Z article:section: Science og:title: Oklahoma Earthquakes Raise Fracking Fears og:description: A normally calm state is hit by a wave of minor earthquakes—causing some to point the finger at fracking. But wastewater disposal wells likely play a bigger role og:url: https://time.com/8782/oklahoma-earthquakes-fracking-link/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt16171413b390a495/698682e035ba6f50f2c00a83/140218-fracking-earthquake.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 1400 og:image:height: 788 og:image:alt: Earthquakes have been linked to oil and gas disposal wells in states like Kansas og:type: article twitter:card: summary_large_image twitter:title: Oklahoma Earthquakes Raise Fracking Fears twitter:description: A normally calm state is hit by a wave of minor earthquakes—causing some to point the finger at fracking. But wastewater disposal wells likely play a bigger role twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt16171413b390a495/698682e035ba6f50f2c00a83/140218-fracking-earthquake.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # Oklahoma Shakes—Is Fracking to Blame?  by [Bryan Walsh](https://time.com/author/bryan-walsh/)  ## Bryan Walsh Feb 18, 2014 9:20 PM UTC  Earthquakes have been linked to oil and gas disposal wells in states like Kansas. Earthquakes have been linked to oil and gas disposal wells in states like Kansas.Travis Heying—Wichita Eagle/MCT/Getty Images  by [Bryan Walsh](https://time.com/author/bryan-walsh/)  ## Bryan Walsh Feb 18, 2014 9:20 PM UTC It’s been a shaky week in Oklahoma. The Sooner State has experienced [more than 150 earthquakes](http://www.koco.com/news/oklahomanews/okc/ogs-150-quakes-in-one-week-in-oklahoma/24535916#mid=18402726) over the past week, far more than the Okies usually get. And while the vast majority of the quakes were fairly minor, one, on Feb. 16 measured 3.8 on the Richter scale, followed by a number of aftershocks. There’s been little damage reported, but the quakes jolted folks in a part of the country who aren’t accustomed to the Earth moving under their feet. “\[It\] felt like bombs going off,” central Oklahoma resident Nancy York [told](http://www.630wpro.com/common/more.php?m=58&ts=1392705303&article=EC05505897CF11E3B51EFEFDADE6840A&mode=2) ABC News affiliate KOCO-TV. “It’s just a huge noise and then it’s like a reverb from that boom that just shakes the entire house.” Something is clearly going on in Okalahoma—and has been for a while now. Residents have experienced more than 200 quakes with a magnitude of at least 3.0 since the beginning of 2009, and more than 2,600 tremors altogether during 2013\. (A 3.0 magnitude quake is considered the threshold at which most people can feel shaking.) According to a recent [analysis by EnergyWire](http://www.eenews.net/stories/1059991119), Oklahoma is now the second most seismically active state in the continental U.S., after California. So what’s happened? Suspicion has turned to the energy sector. Oklahoma is the center of the country’s hydrocarbon industry, with tens of thousands of oil and gas wells dotting the state. Some of those wells have been drilled with the use of hydrofracking, in which explosives are used to generate cracks in a layer of shale rock thousands of feet below the surface. Millions of gallons of fracking fluid—most of which is water—are then pumped underground to keep the cracks open, allowing oil and natural gas that had been trapped in the shale rock to flow back to the surface. Surely it’s not too difficult to think that a process meant to break up the ground could end up triggering an earthquake. **(MORE:** [**Your City Might Not Be Ready for the Next Big Quake**](http://science.time.com/2013/10/17/your-city-might-not-be-ready-for-the-next-big-quake/)**)** But while a few studies have [linked the act of fracking](http://www.newscientist.com/article/dn21120-how-fracking-caused-earthquakes-in-the-uk.html#.UwO5qkJdU4o) to minor earthquakes, there’s no definitive proof yet that fracking by itself can cause noticeable quakes. What’s more likely at fault are wastewater disposal wells. When an oil or gas well has been drilled, millions of gallons of wastewater—tainted with hydrocarbons and any number of other unhealthy contaminants—flow back up to the surface. That wastewater needs to be contained, so companies drill new wells, and inject the liquid underground at extremely high pressures. It’s [entirely possible](http://www2.seismosoc.org/FMPro?-db=Abstract%5FSubmission%5F12&-sortfield=PresDay&-sortorder=ascending&-sortfield=Special+Session+Name+Calc&-sortorder=ascending&-sortfield=PresTimeSort&-sortorder=ascending&-op=gt&PresStatus=0&-lop=and&-token.1=ShowSession&-token.2=ShowHeading&-recid=224&-format=%2Fmeetings%2F2012%2Fabstracts%2Fsessionabstractdetail.html&-lay=MtgList&-find) that the high water pressure used in these injection wells—and there are more than 10,000 of them in Oklahoma—may nudge previously dormant faults out of their locked position. A study published in _Science_ last year [linked](http://www.ldeo.columbia.edu/news-events/seismologists-link-ohio-earthquakes-waste-disposal-wells) unusual earthquakes in Ohio to the presence of nearby disposal wells, and other [research in Oklahoma](http://www.eenews.net/stories/1059967722) has raised similar concerns. It’s not yet clear exactly how disposal wells might be causing or contributing to these unusual “swarms” of earthquakes. It’s possible there’s something more natural at work. Austin Holland, Oklahoma’s state seismologist, has [raised the possibility](http://www.news9.com/story/23899666/latest-swarm-of-ok-earthquakes-could-be-tied-to-lake-acardia) that historically high water levels at Oklahoma’s Lake Arcadia may be playing a role, perhaps by placing additional stress on dormant faults. In any case, though, Oklahoma is not alone—other normally calm states like Kansas, Arkansas and Texas have experienced unusually heavy seismic activity in areas near oil and gas drilling and disposal wells. Kansas Governor Sam Brownback announced on Feb. 17 that he would [appoint a committee](http://www.kansas.com/2014/02/17/3294789/gov-sam-brownback-appoints-panel.html) to study what role oil and gas activity might be playing in a recent spate of minor quakes in the state. Given that oil and natural gas production is on the rise in the U.S.—and that there are more than 30,000 deep injection wells throughout the country—that’s a question that needs an answer. **(MORE:** [**How Earthquakes Heal Themselves — and Why That’s Important**](http://science.time.com/2013/06/30/how-earthquakes-heal-themselves-and-why-thats-important/)**)** ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/8782/oklahoma-earthquakes-fracking-link/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/8782/oklahoma-earthquakes-fracking-link/"},"headline":"Oklahoma Shakes—Is Fracking to Blame?","datePublished":"2014-02-18T21:20:17.000Z","dateModified":"2026-02-21T06:26:51.474Z","description":"A normally calm state is hit by a wave of minor earthquakes—causing some to point the finger at fracking. 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