Oklahoma earthquake likely caused by wastewater injection, seismologist says
by Associated Press in Oklahoma City from on (#Q2S7)
Magnitude-4.4 temblor Saturday was among nearly 700 earthquakes of magnitude 3 or greater in state this year, compared to 20 throughout 2009
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.
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