Oklahoma Geological Survey seismologist, Austin Holland, installs a seismometer in southwest Oklahoma City, Okla., on January 26, 2015. (Linda Davidso...

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A magnitude-3.0 earthquake is small, but most people can feel it. Historically, Oklahoma got less than two of those a year, but in 2013 it became two a week. It's only gotten more active since then — last year, the state had three times as many earthquakes as in the entire seismically active state of California. Austin Holland, research seismologist at the Oklahoma Geological Survey, gestures to a chart of Oklahoma earthquakes in June 2014 as he talks about recent earthquake activity at…

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Oklahoma geologic survey provides a Google Earth .kml file listing all the 2014 earthquakes (past 4 months up to April 10, 2014) — literally over 500 events on the map

Preliminary reports showed a 5.6-magnitude quake centered about 45 miles northeast of Oklahoma City at 10:53 p.m...Geological Survey, the ...

Oklahoma Geological Survey. 4/21/2015 - The OGS considers it very likely that the majority of recent earthquakes, particularly those in central and north-central Oklahoma, are triggered by the injection of produced water in disposal wells.

AUGUST 19, 2014 OKLAHOMA CITY — An earthquake rattled central Oklahoma at 7:41 am Tuesday morning. Emily Sutton and Lacey Lett were on the air on KAUT broadcasting when the quake hit. According to the US Geological Survey the quake measured 4.2. The Oklahoma Geological Survey is calling the quake a 4.3. The epicenter of this quake SSW of Guthrie, in the Liberty Lake area of southern Logan County.

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