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A powerful earthquake rattled Oklahoma last night. Residents throughout a large part of the state reported the ground shaking at about 11:24 last night, The United States Geological Survey reported the preliminary 5.1 magnitude quake was centered about four miles northwest of Prague. Residents from Oklahoma City to Tulsa reported the ground shaking as the quake hit. There have since been at least 3 lesser quakes or aftershocks. There are so far no reports of major damage.