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  1. #1
    Senior Member JohnDoe2's Avatar
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    Oklahoma rattled by an uptick in earthquakes

    Oklahoma rattled by an uptick in earthquakes

    Laura Petrecca, USA TODAY7:36 p.m. EDT April 12, 2014


    (Photo: Justin Juozapavicius, AP)

    Oklahoma, a state more known for tornadoes than seismic shifts, is becoming all too familiar with earthquakes of late.

    In the past seven days, 48 quakes larger than the magnitude of 2.5 have struck,
    says Paul Caruso, a geophysicist with the U.S.

    Geological Survey. In the past 30 days, there have been 157 quakes larger than magnitude 2.5.


    "We've never seen anything like this in Oklahoma," he says.

    The numbers back him up.

    "Since 2009, the earthquake activity in Oklahoma has been approximately 40 times higher than in the previous 30 years," says a February report from the Oklahoma Geological Survey, a group that first began monitoring earthquakes 40 years ago.


    About two to six earthquakes a year in Oklahoma were recorded by the USGS National Earthquake Information Center from 1972 to 2008.


    In 2009, about 50 earthquakes were recorded, and the numbers have continued to climb.


    In 2011, the state had magnitude 4.7 and 5.6 earthquakes in November, with the 5.6 magnitude event "the largest quake to hit Oklahoma in modern times," says the USGS. At least two people were injured, 14 homes were destroyed and many were damaged, says the USGS.


    All the recent shaking has rattled residents' nerves — and has led to speculation, and debates, about what's behind the tremors. Some have taken to social media and other public forums contending that hydraulic fracturing — or fracking — and the deep-injection wells used for disposal of fracking wastewater could be causing the uptick.


    The February OGS report says it "has not ruled out that some earthquakes may have a relationship to oil and gas activities such as water disposal/injection, and examining these issues remains a major focus of ongoing research."


    Yet the report added that "the majority, but not all, of the recent earthquakes appear to be the result of natural stresses, since they are consistent with the regional Oklahoma natural stress field."


    An October statement from the U.S. Geological Survey, made in partnership with the OGS, said "a contributing factor to the increase in earthquakes triggers may be from activities such as wastewater disposal — a phenomenon known as injection-induced seismicity."


    But at this point, "there is nothing conclusive," regarding the cause of increased earthquake activity, says Priyank Jaiswal, an assistant professor at Oklahoma State University's Boone Pickens School of Geology.


    While studies on possible causes are being conducted, he advocates for more general education for the public to understand the basics of oil and gas drilling, fracking and deep-injection wells.


    Whether these quakes are natural or human-induced, residents need to understand the potential causes, and that that there could be more quakes to come, he says.


    "When our homes shake, we are concerned," he says.


    http://www.usatoday.com/story/news/n...ahoma/7649531/

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    Senior Member JohnDoe2's Avatar
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    Oklahoma Shaken by Seven Earthquakes since Friday Night
    KTUL - ‎6 hours ago‎

    Overnight Earthquakes Rattle Near Perry, Guthrie
    News On 6 - ‎10 hours ago‎

    Oklahoma Had Nearly 150 Earthquakes in One Month
    WFJA Classic Hits and Oldies 105.5 FM - ‎Apr 11, 2014‎


    4 tips for surviving Oklahoma earthquakes
    NewsOK.com - ‎Apr 11, 2014‎


    In Depth

    Earthquakes shake central Oklahoma Wednesday and Thursday
    NewsOK.com - ‎Apr 10, 2014‎

    A 4.1 magnitude earthquake was reported in central Oklahoma. The quake happened early Thursday and was one of several in the area. FROM STAFF REPORTS • Modified: April 10, 2014 at 5:42 pm • Published: April 10, 2014...
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    Senior Member JohnDoe2's Avatar
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    Senior Member JohnDoe2's Avatar
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    Oklahoma breaks record with hundreds of earthquakes after fracking intensifies

    http://rt.com/usa/oklahoma-earthquak...-fracking-961/
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