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Wastewater injection may be cause of Oklahoma 'earthquake swarm,' USGS study suggests

Ana Komnenic | October 24, 2013 | 10:21 pm Energy Europe 

Between 1975 and 2008, Central Oklahoma experienced about one to three manginute 3.0 earthquakes per year. Since 2009, that figure has jumped to around 40 per year. In an effort to explain these tremors, the US Geological Survey (USGS) and...

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