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Oklahoma earthquake likely caused by wastewater injection, seismologist says | |
(35 minutes later) | |
A moderate, magnitude-4.4 earthquake has shaken northern Oklahoma. | |
It was one of the stronger temblors the earthquake-prone state has had this year. | |
There were no initial reports of damage or injuries from Saturday morning’s earthquake, which was 18 miles southwest of Medford and four miles deep. | |
US Geological Survey seismologist George Choy said it had all the hallmarks of an induced quake, meaning it was triggered by the injection of drilling wastewater underground. | |
Choy said this seems to be part of an ongoing swarm of induced quakes in the area. Oklahoma Geological Survey records show there have been nearly 700 earthquakes of magnitude 3 or larger in Oklahoma this year. That’s up from 20 in all of 2009. This is the seventh magnitude-3.0 or larger quake this week. | |
Related: Earthquake spike pushes Oklahoma to consider tighter fracking regulations | Related: Earthquake spike pushes Oklahoma to consider tighter fracking regulations |
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