Eastern USA Earthquake Information
The latest map and report from the U.S. Geological Survey on the long history of activity in the central Mississippi Valley, issued in April 2004.
This handy linklist from the National Earthquake Information Center includes Puerto Rico and the Virgin Islands.
An online Fact Sheet about the soft, quaking underbelly of America from the U.S. Geological Survey.
"On Shaky Ground" is a long series from the St. Louis Riverfront Times on the earthquake hazard in this area where the greatest American earthquake in history occurred in 1811–12, affecting every state near the confluence of the Mississippi and Missouri rivers.
There have been some pretty big ones, according to the National Center for Earthquake Engineering Research in Buffalo.
A page of resources from the Ohio Geological Survey.
A FAQ from the University of Texas.
Thanks to the Virginia Tech Seismological Observatory.