From an article in today’s Oklahoman:

On Saturday, a corporation commission spokesman said Oklahoma’s 3.0 magnitude and greater earthquake activity has dropped by more than 98 percent since 2017 since the commission initiated large-scale actions in 2015.

In a statement, the commission said:

"Our OCC Induced Seismicity Dept is researching these quakes. The quakes that occurred years ago (2014-2017) in the area were linked to oil and gas wastewater disposal wells that used the deep Arbuckle formation. They were shut down by the OCC years ago. Hydraulic fracturing has been linked to quakes in other areas, but there are no such activities in the Arcadia area."