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"I don't think it's realistic that this treasure will be sitting underneath us and we won't use it, " Armbruster said.
CNN: Debate over fracking, quakes gets louder
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Depending on its location, "any disposal well that's been pumping stuff into the ground for months can cause earthquakes, " said Armbruster, who's studied earthquakes and drilling for 40 years.
CNN: Debate over fracking, quakes gets louder
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L-3 Communications Holdings ( LLL - news - people ) also falls into this hybrid category, Armbruster says, because it's trading at 10 times earnings, but it is also anticipating 4% top-line growth.
FORBES: Intelligent Investing Panel
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John Armbruster of Lamont-Doherty Earth Observatory, Columbia University, who's been studying seismic events and fracking in the Youngstown area for months, said Friday that it's "virtually certain" that an injection of fracking wastewater caused the New Year's Eve tremor.
CNN: Debate over fracking, quakes gets louder
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"That's too weak, " Armbruster said.
CNN: Debate over fracking, quakes gets louder