Or, the Jolly Green Giant flushed his toilet.
Or, Teddy Kennedy did a cannonball from an Alaskan Cliff.
If they could confirm what caused it, would it make any difference? Then or in the future?
Well, their problem was that they couldn't figure out how a 7.2 earthquake could have created such large tsunamis... so they invented this HUGH undersea avalanche to explain it. Now they are back to square one... no avalanche.
Since they thought that a large avalanche caused the tsunamis, they have been looking for areas that might have other large avalanches and some of their warning system for tsunamis is based on what may be a flawed theory. That is series.
However, with our modern system of seismagraphs, satellite observations, and other cool stuff, we could still warn any places due to be struck by a tsunami early enough to get the people out and give them time to say good-bye to their houses...
But then we didn't get the word out fast enough in Sumatra and Thailand...