Quake-related information—maps, reports, advice—for the Eastern United States.
Eastern U.S.: Seismic Hazard Map—From the Global Seismic Hazard Assessment Program.
Central U.S.: Earthquakes 1699-2002—The U.S. Geological Survey summarizes three centuries of activity in the central Mississippi Valley.
Eastern U.S.: US Earthquake Information by State—A handy linklist from the National Earthquake Information Center.
Northeastern U.S.: Lamont-Doherty Seismographic Network—Columbia University has data and links for a large area centered on New York City.
[link url=http://quake.wr.usgs.gov/prepare/factsheets/NewMadrid/]Mississippi Valley Earthquakes
Mississippi Valley: New Madrid Seismic Zone—"On Shaky Ground" is a long series from the St. Louis Riverfront Times on the hazard in this area where the great earthquakes of 1811–12 affected every state near the confluence of the Mississippi and Missouri rivers.
New York State Earthquakes—There have been some pretty big ones, according to the National Center for Earthquake Engineering Research in Buffalo.
Ohio Earthquakes—A page of resources from the Ohio Geological Survey.
Puerto Rico and Virgin Islands: Earthquake Information—A handy linklist from the National Earthquake Information Center.
Texas Quakes—An earthquake FAQ from the University of Texas.
Virginia Earthquakes—A good set of resources from the Virginia Tech Seismological Observatory.
