![Photo of Storm clouds hover over a field in Oklahoma. Geologist there have been chasing down unusual signal in their seismic data that grew in frequency and spread as the summer wore on.](https://www.boisestate.edu/wp-content/uploads/sites/153/2019/09/Storm-Clouds-300x239.png)
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.