http://wwwneic.cr.usgs.gov/neis/bulletin/mag7.html#1999 Mag. 7 and greater for 1999 and 2000

http://wwwneic.cr.usgs.gov/neis/bulletin/99_EVENTS/1999_data.html all 1999 earthquakes

http://neic.usgs.gov/neis/eqlists/10maps_world.html 10 largest in century

http://zephyr.rice.edu/plateboundary/quakes.72.gif earthquakes 1990-1995

http://www.nmnh.si.edu/gvp/volcano/index.htm world map

http://zephyr.rice.edu/plateboundary/volcano.72.gif worldwide distribution of historically active volcanos

http://volcanoes.usgs.gov/ United States

http://volcano.und.nodak.edu/ volcano world

http://pubs.usgs.gov/publications/text/Vigil.html diagram of plate boundaries and volcanos

http://pubs.usgs.gov/pdf/planet.html

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