CNN has a special feature dealing with major quakes in the past 20 yrs. It's only about 3-4 slides.
http://www.cnn.com/2010/WORLD/americas/03/09/charts.earthquakes/index.html?hpt=C2
http://www.cnn.com/2010/WORLD/americas/03/09/charts.earthquakes/index.html?hpt=C2