earthquakes videos

http://video.nationalgeographic.com/video/environment/environment-natural-disasters/earthquakes/earthquake-101/
http://www.youtube.com/watch?v=CtBXTvtFaCU
http://www.youtube.com/watch?v=sZPNjLj8hR8
http://www.youtube.com/watch?v=gl4FvHKzAlU&feature=related