Earthquake Notification Service. Sign up here to customize your own notification service of earthquakes occurring anywhere in the world.
ShakeMap, a USGS product to provide near real-time maps of ground motion and shaking intensity following significant earthquakes.
PAGER, another USGS product providing near real-time estimates of population and cities exposed to severe shaking following significant earthquakes.
Earthquake Engineering Research Institute - Includes an earthquake clearinghouse of reports, lessons learned, and research on key large earthquakes occurring in the U.S. and around the world.
NOAA's National Geophysical Data Center - earthquake and tsunami information, including tsunami inundation digital elevation models, and a lot of data sets.