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Wastewater well depths linked to Oklahoma quakes

Adapted from Hincks et al., 2018, “Oklahoma’s induced seismicity strongly linked to wastewater injection depth”; Map: Lazaro Gamio / Axios

Scientists know that wastewater injection related to fracking for oil and gas can induce earthquakes. A new study published in Science Thursday found that the deeper these injections go towards a layer of rock called the crystalline basement, the more likely they are to cause earthquakes.

Why it matters: Oklahoma never used to experience many earthquakes, but since 2009, a number of damaging temblors have shaken the area. "State regulators could cut about in half the number of man-made quakes by restricting deep injections in the ground," study author Thea Hinck told the Associated Press.