Center for Earthquake Research and Information. University of Memphis. "Earthquake Fact and Follies." September 18, 2001. January 18, 2002.  <http://www.ceri.memphis.edu/public/follies.shtml>.

Center for Educational Technology. "Earth Floor-Plate Tectonics." September 14, 2001. February 24, 2002. <http://www.cotf.edu/ete/modules/msese/earthsysflr/plates2.html>.

Earthquake Facts and Follies. 28 May 2001 <http://www.ceri.memphis.edu/public/follies.shtml>

Rock Hounds. 28 Feb. 2002 <http://www.fi.edu/fellows/payton/rocks/index2.html>. 

U.S. Department of the Interior, U.S. Geological Survey. 22-Nov-1999. January 28, 2002. <http://www.usgs.gov/sci_challenge.html>.

U.S. Geological Survey. Cool Earthquake Facts. 26 May 2001<http://earthquake.usgs.gov/4kids/facts.html>.

Watson, John. How Earthquakes Happen. 27 May 2001 <http://pubs.usgs.gov/gip/earthq1/how.html>.