http://www.care2.com/causes/fracking-may-have-caused-50-earthquakes-in-oklahoma.html

News is spreading that the United States Geological Survey has released a report that links a series of earthquakes in Oklahoma last January to a fracking operation underway there.

See also Fracking Caused Earthquakes in England about similar events near Blackpool.

http://www.treehugger.com/energy-disasters/fracking-caused-earthquakes-england.html