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Oklahoma City, Oklahoma – Two small earthquakes struck northwest of the Oklahoma City metro late Friday night, marking back-to-back tremors within about 90 minutes in central Oklahoma.
According to the U.S. Geological Survey and the Oklahoma Geological Survey, the first quake measured magnitude 2.5 and occurred about 9 kilometers east-northeast of Calumet at 5:52 p.m. local time. The tremor originated about 2.7 kilometers below the surface, placing it within the shallow crust where most Oklahoma earthquakes occur…