Dr. Todd Halihan, OSU Professor of Hydrogeology of Fractured Aquifers and Hydrophysics, states Oklahoma is now more seismically active than the state of California. He also explains fracking, wastewater injection and earthquakes.

“In Oklahoma, we’re really, really statistically unlikely. We’re playing Blackjack and winning lots of hands — way more than we statistically should,” Halihan said. “Statistically, it’s weird that a lot of them happen at the same time and there was a lot of injection going on, but you don’t have a tie that says, I feel that pressure right by where that happened and it went way up."

From January to May of 2014, seismic risk went up another factor in Oklahoma. “It’s not a slight statistic change,” Halihan said. “We haven’t gotten slightly more shaky. We’ve gotten way, way more shaky. Statistically, it’s really bizarre.”

Halihan referenced an updated report released by the U.S. Geological Survey which indicated that Oklahoma was likely to have a larger magnitude earthquake than it has experienced before, without indicating cause.
[link to bakken.com]