New maps released by the US Geological Survey this week reveal that seven million people are now living in areas at high risk for earthquakes. Not naturally occurring earthquakes but man-made - induced by oil and gas operations that pump wastewater deep underneath the ground. At highest risk? Parts of Oklahoma, Texas and even Colorado. Last year Oklahoma had more than 900 quakes, up from 3 in 2007.

For Inside Energy, Larry Buhl looks into the challenge facing homeowners there who claim their property is damaged by these quakes.