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New Concern Over Quakes in Oklahoma Near a Hub of US Oil
http://www.nytimes.com/2015/10/15/us/new-concern-over-quakes-in-oklahoma-near-a-hub-of-us-oil.html?emc=edit_th_20151015&nl=todaysheadlines&nlid=16092731&_r=0

By MICHAEL WINES NY Times today
An earthquake in central Oklahoma last weekend has raised fresh concern about the security of a vast crude-oil-storage complex that sits at the crossroads of the nation's oil-pipeline network.

The Cushing quake is among the largest of thousands of temblors that have rocked central and northern Oklahoma in the past five years, largely set off by the injection of oil and gas industry wastes deep into the earth. The watery wastes effectively lubricate cracks, allowing rocks under intense pressure to slip past one another, causing quakes.