Oklahoma regulators are reviewing the operations of eight Oklahoma disposal wells following a magnitude 4.2 quake near the oil hub of Cushing on Friday morning.
A 4.2 magnitude quake hit Stroud, Oklahoma on Friday morning, sending aftershocks rumbling throughout the region.
A 3.8-magnitude quake followed, and there was a third that has not yet been assigned a magnitude.
Another 3.8 magnitude quake was recorded at 9:04 a.m.in the same area.More news: 80 percent of Windows phones just lost support
Preliminary data from the United States Geological Survey (USGS) shows 6 events in the area, beginning at 8:47 a.m.
Early reports indicate the natural disaster had an epicenter in Oklahoma.
It was unclear if the temblors were linked to wastewater injection, but an oil and gas inspector was investigating, the OCC said. The area is within the main natural disaster Area of Interest (AOI) where oil and gas wastewater disposal into the Arbuckle formation has been sharply reduced.
So far, oil companies operating the tanks and pipelines around the Cushing hub have reported no damage.