Explanation of seismic waves Primer on seismology. http://www.geo.mtu.edu/UPSeis/waves.html (Added: Fri Feb 14 2003)
Seismic Waves Tutorial on seismology and seismic phenomena. http://lasker.princeton.edu/ScienceProjects/curr/waves/seismic_waves.htm (Added: Fri Feb 14 2003)