© OKGEOSURVEY
Here the anomaly can be seen at station SC14, boxed in red. It repeated once in this instance, as it usually does (June 26, 2019). (Each horizontal line represents an hour.)
"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.'
Curious about what we were seeing, and what our sensors were hearing, we attempted to locate a potential source for individual pulses from the pattern.
This produced nothing but garbage location potentials with errors so high it was useless. We also attempted locating a source using the first arrival time of the pattern at various stations where it was clearly discernible.
This yielded a more interesting result. It still failed to yield a location, however, by plotting out the first arrival times on a map,
the anomaly arrived in a 'ping pong' like pattern back and forth across the state, mainly in a swath from Tulsa, across OKC and toward Lawton.
Comment: Update: Reliefweb on the 5th of August reports: