Earthquake Increase May Be Tied to Wastewater

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April 19 (Bloomberg) -- U.S. government scientists are focusing on the disposal of wastewater from natural gas drilling as a possible cause for the increase in the number of earthquakes that have shaken the central part of the U.S. since 2000. The number of earthquakes in the central part of the U.S. rose to 134 in 2011, up from 50 in 2009. Megan Hughes reports on Bloomberg Television's "Bottom Line." (Source: Bloomberg)