The U.S. Energy Information Administration has produced this 21 second film to show the location of natural gas wells drilled in Pennsylvania between 2005 and 2012. Black dots represent vertical wells, while red dots represent horizontal wells and are used mostly in Marcellus, Utica, and Geneseo/Burket shale formations located in the northeast and southwest portions of Pennsylvania.
There is no sound to the video.
The geographic areas where drilling is shown (especially the horizontal wells) correspond with increased economic activity and real estate prices with stronger support.
Compare Powerlineblog's assessment of corresponding areas of New York, where Marcellus Shale drilling has been restricted.