Although Oklahoma is experiencing an increase in earthquakes, some seismologists say the recent 5.6-magnitude quake likely is not a result of hydraulic fracturing, a process used to release natural gas. "If we were talking a magnitude 1 or 2 earthquake, that'd be different, but it's awfully hard to imagine a hydro-frack being involved with one of this size. We also have to determine if there were any frack jobs going on there right now, but ... it didn't happen in an area of particularly active oil and gas exploration," said Randy Keller, director of the Oklahoma Geological Survey.

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