The ground has been shaking in Kansas. What"s causing these earthquakes?

Some of Oklahoma’s most-powerful earthquakes in the past year gave Kansans a shake in the past week, and a research geophysicist says it is safe to assume these quakes were due to wastewater injections in Kansas and Oklahoma. “This is not particularly surprising — we’re not surprised by this,” said Justin Rubinstein, who is also the deputy chief of the United States Geological Survey's Induced Seismicity Project. While the cause of these quakes has not been confirmed, Kansas Geological Survey senior scientist Rick Miller agreed that they were likely “human-induced earthquakes.”