When I first heard about the catastrophe I wondered if it could have been caused by an asteroid hitting the ocean. It turned out to be an undersea earthquake but the effects of an impact would have been similar.
Now there is talk of setting up a Tsunami early warning system. I just hope it includes sky watching. Right now the Southern Hemisphere is almost blind to NEO's. I did a search to find out if anyone else was thinking along the same lines.
Comment on the SE Asian tsunami disaster, 26 Dec 04. This page is mainly concerned with prevention of future tsunami disasters.
Tsunami from Asteroid/Comet Impacts.
Right now we can't clearly see the shooting gallery we are standing in. As for deflecting or destroying the bullets headed our way, just forget about it. We have nothing built that could reach an asteroid or comet early enough in its journey to nudge it away. We are blind and naked.