An Acoustic Anomaly

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Mysterious happenings here – something to do with fracking perhaps?

OK Geological Survey Field Blog

by Andrew Thiel, OGS Research Scientist

“What is that?” asked Dr. Walter, pointing to the seismograms displayed on a flat screen TV hanging on the wall of the OGS seismic lab. There were a series of red marks that indicate automatic picks by the computer as potential earthquakes. However, these marks were spaced very regularly, so regularly that at first glance they looked like some sort of mechanical noise. The problem with that assumption was that they were showing up on stations all across the state, all at the same time. Anything that widespread is usually associated with a correspondingly large scale event, like an earthquake. This pattern we were seeing looked nothing like an earthquake, or even a series of earthquakes. Other potential causes we guessed at were military aircraft, meteor shower, or something related to gas pipelines. We dubbed this acoustic pattern ‘The Anomaly.’ 

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