Active US nuclear plants, verified as active March 2011. Data compiled from a variety of sources and verified against the NRC (Nuclear Regulatory Commission) list of operational nuclear power reactors.

10 and 50 mile derived evacuation zones surrounding nuclear plants. 10 and 50 miles represent official evacuation distances used in the United States.

Earthquakes with magnitude 7 or greater since 1973. Data courtesy of Pacific Disaster Center.

Locations of faults and associated folds, in the United States, that are believed to be sources of significant earthquakes. Data courtesy of Quaternary Faults and Fold Database and USGS.

Global tectonic plate boundary data provided by USGS.