http://tlc.discovery.com/convergence/quakes/articles/tremortech.html
http://www.ideers.bris.ac.uk/resistant/resist_home.html
http://mceer.buffalo.edu/connected_teaching/lessons/aboutEQengineering.pdf
http://www.exploratorium.edu/faultline/damage/building.html
http://www.exploratorium.edu/faultline/damage/retro.html
http://www.imaginationstationtoledo.org/content/2011/03/can-you-build-an-earthquake-proof-building