Oklahoma has never been known as earthquake country, with a yearly average of about 50, most minor. But in the past three years, the state has had thousands of quakes. Continued: Experts Eye Oil and Gas Industry as Quakes Shake Oklahoma ; ;Related ArticlesDot Earth Blog: Lake Effect on Display: Cold Winds Over (Relatively) Warm WatersNewly Discovered Greenhouse Gas ’7,000 Times More Powerful Than CO2′Energy Department to Give $226 Million to Support Nuclear Reactor Design ;

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Experts Eye Oil and Gas Industry as Quakes Shake Oklahoma