National Earthquake Hazards Program
NOAA National Oceanic & Atmospheric Administration's Tsunami site
Here's a nice seismic site en Francais
Smithsonian Institute's Global Volcanism Program (Find out what's erupting right now!)
Volcanos Page at the Michigan Technological University
Cascades Volcano Observatory run by the U.S. Geological Survey
Hawaii Volcano Observatory, also, by the USGS
How volcanoes work at San Diego State University
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