Earthquake strength is measured by S and P waves.
http://aspire.cosmic-ray.org/Labs/SeismicWaves/
http://www.classzone.com/books/earth_science/terc/content/visualizations/es1002/es1002page01.cfm
A lab to do
http://www.sciencecourseware.com/virtualearthquake/vquakeexecute.html
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