Advance tsunami warning system

They want to build an early warning system of some sort or something to pick up tsunamis/tidal waves to alert people. A weak excuse really. General knowledge would tell you that when an underwater earthquake occurs, the shift and displacement of the teutonic plates would displace an enormous amount of water, which moves and forms the tsunami.

Hence, people with enough knowledge in these matters would be able to tell that a tsunami would occur. And in fact it was; a warning was issued to Pacific nations within minutes by the NOAA, but not beyond that as 'it was not in the area of responsability'. Another version alleges 'that people in the know had wanted to warn countries around the Indian ocean but did not know who to inform.'

Well, no warning? I think its more of a lack of communication and responsability.