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Hitzman said it's still too early to tell whether those recent quakes would have changed the report's conclusions. Another study - also too recent for the research council report - says a 4.7 magnitude quake in central Arkansas in 2011 was man-made and scientists are still looking at a 2011 quake in Oklahoma that measured 5.6 as a potential but not proven induced tremor, Ellsworth said. The man-made quakes that Ellsworth has been seeing are almost all related to wastewater injection, he said. Ellsworth said he agreed with the research council that "hydraulic fracturing does not seem to pose much risk for earthquake activity." If the country starts capturing the global warming gas carbon dioxide from coal power plants and injecting it underground, there is a potential for a larger quakes given the amount of the heat-trapping gas that would have to be buried, the council's report said. That's an issue that needs more study, it said. Congress and the Department of Energy requested the 240-page report. ___ Online: The National Research Council report:
http://www.nap.edu/catalog.php?record-id13355
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