Maintenance workers inspect the damage to one of the spires on Benedictine Hall at St. Gregory's University following an earthquake in Shawnee, Okla, Nov. 6, 2011. (AP/Sue Ogrocki)

Fracking Has Made Oklahoma As Earthquake-Prone As San Francisco

According to a new USGS earthquake risk map, Oklahoma is now one of the most earthquake-prone places in the U.S. – all thanks to oil and gas extraction in the state.