The now-5.8-magnitude temblor is the largest recorded earthquake in Oklahoma, USGS said. Federal scientists also revised upward the magnitude of Oklahoma's 2011 earthquake near Prague. The ...

But Oklahoma County, which includes the more ... In fact, the second-largest earthquake in the state's history may have been caused by human activity, according to a study by the USGS.

Two earthquakes rattled Edmond, Oklahoma Friday morning, measuring 2.9 and 2.8 magnitude and hitting minutes apart just after 4 a.m. This comes just more than a year after several earthquake ...

HELENA, Okla. – The US Geological Survey reports a 4.0 magnitude earthquake stuck northwestern Oklahoma early Friday. The USGS says the quake was recorded at 12:27 a.m., 12 miles northeast of ...