Oklahoma's earthquake rate now an issue of national security

A 4.5-magnitude earthquake rocked Cushing on Oct. 10. It could be felt as far away as Oklahoma City, some 75 miles to the south. Viewer after viewer called the KOCO newsroom to report that they, too, felt the shaking. At least one building had the bricks ripped right off its side, photos would later reveal. No injuries were reported. That was just the latest in what's been a record year of seismic activity in the state.

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