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Fracking Blamed for Record Oklahoma Tremors in 2014 April 11, 2014
Quake Map of
The number of injection wells with suspected connections to earthquakes is a small fraction of total wells, according to the industry group America’s Natural Gas Alliance.
The at least 110 earthquakes of magnitude 3 or higher that have shaken Oklahoma so far this year total more than during all of 2013.

They come in the wake of the state’s explosive growth in fracking, or underground hydrological fracturing, used in the extraction of natural gas and oil.

Pumping fracking wastewater underground has been linked to a sixfold jump in quakes in the central U.S. from 2000 to 2011, according to the U.S. Geological Survey.

Before tracking became common, Oklahoma used to experience fewer than six earthquakes per year.