Effect of (earthquake/land?) depth:
http://www.usc.edu/CSSF/History/2012/Projects/J0118.pdf
The shallower the slower the wave will move.
(However I also read something shortly about as wave reaches shallow water
it becomes higher).
This new quake seems to be in somewhat less depth 10km instead of 30km then
1960.
Not sure how that will make a difference.
Bye,
Skybuck.