Both before and after the recent tsunami disaster, I happened to be watching the series Savage Earth that I picked up on DVD here in China (it's usually touted as the "Discovery" series by the locals, but in reality it's just a collection of various science, history & nature programs from a few years back).
Airing in 1998, the series explains the science behind tsunamis and earthquakes (with detailed comparisons between the 1994 Northridge quake and that in Kobe)
The series may air again, given its applicability, but the show website is here for those interested:
http://www.pbs.org/wnet/savageearth/