Maps

Maps of earthquake data from the Los Angeles region.
(Level: student and teacher)
http://coke.physics.ucla.edu/laptag/earthquake/
http://www.geocities.com/~naldecon/earthquake.htm Movements of the ground

A map of current world seismic activity.
(Level: student and teacher)
http://wwwneic.cr.usgs.gov/neis/current/world.html Richter scale

This page becomes fairly heavy, but has an interesting table of the effects of different strengths of earthquake and some data on past earthquakes.
(Level: student and teacher)
http://quake.seismo.unr.edu/ftp/pub/louie/class/100/magnitude.html Fault lines

A nice page with interesting graphics and satellite pictures which show earthquake regions and how plate movements can explain them.
(Level: student and teacher)
http://quake.seismo.unr.edu/ftp/pub/louie/class/100/plate-tectonics.html Seismograms

Using and interpreting a seismogram.
(Level: student and teacher)
http://vflylab.calstatela.edu/edesktop/VirtApps/VirtualEarthQuake/VQuakeExecute.html Body waves

Broad description of the types of wave, their properties and how they can be used to locate the epicentre of a quake. Good diagrams.
(Level: student and teacher)
http://quake.seismo.unr.edu/ftp/pub/louie/class/100/seismic-waves.html Probing inside the Earth

Using earthquake waves to determine the structure of the Earth.
(Level: student and teacher)
http://tiger.chm.bris.ac.uk/cm1/JohnH/Welcome.htm Change in speed

A graphic showing speeds of seismic waves and how they vary with depth.
(Level: student and teacher)
http://www.dc.peachnet.edu/~janderso/images/seisvel.jpg Refraction

Detailed discussion of seismic waves, their refraction and patterns of standing waves.
(Level: teacher)
http://sunquakes.geol.binghamton.edu/class/geo205/notes/GE205-3.html Mantle

This page includes a wonderful cutaway diagram of the Earth.
(Level: student and teacher)
http://www.geosci.unc.edu/classes/Geo15/G15.html Preparation for an earthquake

How to prepare for an earthquake.
(Level: student and teacher)
http://www.lafd.org/eqhomepl.htm