Oklahoma quakes tied to how deep wastewater is injected
WASHINGTON (AP) " A new study finds that a major trigger of man-made earthquakes rattling Oklahoma is how deep " not just how much " fracking wastewater is injected into the ground.Scientists analyzed more than 10,000 wastewater injection wells where 96 billion gallons of fluid " leftover from hydraulic fracturing " are pumped yearly. The amount of wastewater injected and the depth are key to understanding the quake outbreak since 2009, they reported in Thursday's journal Science . [...]
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