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Between 1957 and 1982, water flooding was conducted to improve petroleum production in the Cogdell oil field north of Snyder, TX, and a contemporary analysis concluded this induced earthquakes that occurred between 1975 and 1982. No further activity was detected between 1983 and 2005, but between 2006 and 2011 18 earthquakes having magnitudes 3 and greater were detected. Since 2004 significant volumes of gases including supercritical CO2 have been injected into the Cogdell field. The timing of gas injection suggests it may have contributed to triggering the recent seismic activity. [Source: Proceedings of the National Academy of Sciences of the United States of America]
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