Link to the latest report by the National Academy of Sciences on the research associated with the linkage between earthquakes and fracking. The report said the increased earthquake risk probably comes from a related activity - - injecting large amounts of drilling waste underground for disposal.
The Barnett Shale, which stretches from Dallas County to the west past Fort Worth, has nearly 20,000 natural gas production wells. Almost all were drilled in the past five years . But the region has only 100 waste injection wells . Scientists have tied the timing and locations of earthquakes to the injection wells.
http://www.nap.edu/catalog.php?record_id=13355
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