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May 24, 2013 | 08:29 am
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Grand Canyon

Mike Sakal/Tribune | Posted: Thursday, April 19, 2012 4:18 pm

Most active earthquake fault line in the U.S.: Grand Canyon Field Institute instructor and guide Marjorie ÒSlimÓ Woodruff (right) looks over the Bright Angel Fault Line on a satellite picture of the Grand Canyon. The Bright Angel Fault is the most active euarthquake fault in the United States, according to Woodruff. Pictured on the left is Grand Canyon visitor Christine Epps of Alexandria, Va. [Mike Sakal/Tribune]

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