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Arkansas has had several quakes over the past several months. Haydar Al-Shukri, director of the Arkansas Earthquake Center at the University of Arkansas at Little Rock believes they are caused by drilling in the area because the quakes are infrequent. He says earthquakes caused by a fault would cause more “constant activity.” He said drilling and injecting the holes with fluid create pressure underground and cause shifting of tectonic plates.
Dale Henry, Petroleum Engineer for over 50 years, said the same thing and drew these diagrams to show how it works. click for a larger view