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Texas Earthquakes Tied to Extraction in Fracking

A recent wave of small earthquakes in and around the Eagle Ford formation in Texas was probably the result of extracting oil and in some cases water used for hydraulic fracturing, according to a study.

Clusters of small-magnitude seismic events between November 2009 and September 2011 were “often associated with fluid extraction,” according to the study scheduled to appear this week in the online edition of the journal Earth and Planetary Science Letters. The study follows previous research that links earthquakes to the disposal of drilling wastewater by injecting it underground.