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Jeffrey Johnson quoted in National Geographic article

Jeffrey Johnson, an associate professor of geosciences, was quoted in a recent National Geographic article titled, “Mysterious waves have been pulsing across Oklahoma.”

It begins: “IT ALL STARTED when a wave swept across Oklahoma on June 24, just before 11:11 a.m. local time. It buzzed one seismometer after another, seeming to ping-pong hundreds of miles across the state. This wave didn’t just breeze by—it pulsed like a geologic heartbeat for about 10 minutes.”

In the piece, Johnson posits that seismometers are picking up unidentified sound waves.