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Oklahoma Temblors Outpace California as Fracking Booms

Squinting into a laptop perched on the back of his pickup, Austin Holland searches for a signal from a coffee-can-sized sensor buried under the grassy prairie.

Holland, Oklahoma’s seismology chief, is determined to find the cause of an unprecedented earthquake epidemic in the state. And he suspects pumping wastewater from oil and gas drilling back into the Earth has a lot to do with it.