Earthquakes, Volcanoes, Tectonics
Earthquakes
- Earthquakes Hazards Program: Good Introductory information on seismology
- Recent Earthquakes (Maps) : Last week's earthquakes
- Virtual Seismogram: Print a seismogram for a particular day and time.
- IRIS: Incorporated Research
Institutions for Seismology
- Southern California Earthquake Data Center: Seismological reports and teaching ideas
- USGS Southern Califorrnia Earthquake site
- Recent Earthquakes in California: USGS
Tectonics
- This Dynamic Earth: USGS online book on tectonics
- Global Change Research Program: Terrestrial and marine processes and global change
Volcanoes
- Volcano World: Useful information and links about volcanology
- Cascades Volcano Observatory: Volcanoes in the cascades plus links elsewhere