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Forensic seismologists: Utah mine collapse source of quake

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Uploaded on Jul 8, 2008

It is a chicken-or-egg question: On Aug. 6, 2007, Utah's Crandall Canyon coal mine collapsed, killing six miners. At about the same time, seismic stations in Utah recorded a seismic event of magnitude 3.9. The question is which came first: Did a minor earthquake cause the mine to collapse? Or was the collapse itself the seismic event?

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