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Quakes decline since injection well closures

By The Associated Press

This article was published March 14, 2011 at 2:56 p.m.

The number and magnitude of earthquakes in central Arkansas has noticeably decreased since the shutdown of two injection wells in the area.

The Center for Earthquake Research and Information recorded around 100 earthquakes in the seven days preceding the shutdown on March 4, and there have been around 60 quakes recorded since then.

The two wells, one owned by Chesapeake Energy and another by Clarita Operating of Little Rock, agreed to temporarily cease injection operations at the request of the Oil and Gas Commission. The commission said preliminary studies showed evidence potentially linking injection activities with a swarm of nearly 1,000 small quakes over the past 6 months.

State geologist Scott Ausbrooks said it’s too soon to tell if the decline is directly related to the well closures.

Comments on: Quakes decline since injection well closures

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Displaying 1 - 4 of 4 total comments

charlie3704 says... March 14, 2011 at 4:30 p.m.

What will you come up with when the quakes go up again? This is way too soon to pass judgement. I have worked on drilling rigs for 37 years and I guess Arkansas is special, because no where else in the world has had this problem.
Arkansas is shooting them selves in the foot, this brings in jobs.

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LevitiCuss says... March 14, 2011 at 5:37 p.m.

Far too little of the value they're extracting from the ground in Arkansas stays there. Jobs are good but the shine wears thin when you have to start buying the water you drink because they fouled your groundwater.

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Morgancub says... March 14, 2011 at 6:40 p.m.

Levi, it is believed that it is the injection of waste materials into the ground that is causing the quakes.. Not the extraction of gas..
And this is too short a period of time to determine anything ...

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NickieD says... March 14, 2011 at 7:35 p.m.

charlie: Jobs? Let's see, there was another guy who employed many people to run his gas chambers and crematoriums, another fella employed thousands in his Gulags.... the point is, 'jobs' are never a logical excuse for stupid or destructive behavior, especially when it can be avoided by thoughtful investment in the future, rather than continuing to slog through the past by hunting and capturing petroleum products.
Also, your belief that drilling has had no deleterious effect on the environment is unfounded and totally incorrect.
See the movie "Gasland" to see what 'fracking' really accomplishes for regular, unsuspecting folk. Even if this result is rare, which is doubtful, why should anyone have to tolerate it in the name of 'jobs'?

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