Over the last five years, Oklahoma has had thousands of earthquakes — an unprecedented increase that has made it the second-most seismically active state in the continental United States, behind California.

The state had 109 temblors measuring 3.0 or greater in 2013 — more than 5,000% above normal. There have already been more than 200 earthquakes this year.

Yikes!

Oklahoma has always had the potential for earthquakes; it has a complex underlying fault system. But until recently, the most powerful quake of the modern era was a 5.5-magnitude temblor in 1952 that left a 15-meter crack in the state Capitol.

Scientists say the more likely cause of the recent increase is underground injection wells drilled by the oil and gas industry. About 80% of the state is within nine miles of an injection well, according to the Oklahoma Geological Survey.

I can’t fathom how many wells that is?!?!?!?!?!

http://www.latimes.com/nation/la-na-oklahoma-earthquakes-20140618-story.html#page=1