This kind of question is always a paradox or dilemma. Fate is set (but Fate is on the side of Ignorance). If it is within one to die a particular way, can he|she avoid that fate? If there is pre-knowledge ("Get away from the shores.") will that person be able to do so? Will that person believe the warning? Will something stop the person's effort to leave? (if Nature wants you gone, you're gone). One seeing this--does one still bother to warn? What if it would indeed matter?

Those who are supposed to heed warnings...will (but that is within their nature, and within Nature).

It boggles the mind, doesn't it?

I think the May 2013 quakes will hit more than one city (and kill people), and that a tsunami is highly likely, and that the Pacific rim area is also highly likely, and that it could just as well be attendant by a volcanic eruption. In that view, the majority of the population of the world will not be affected, but will take note. Regarding tsunami, elevation will be important. The shores, probably not a good place. At the beach on the west coast of America or South America or Canada or Alaska, and hear of a major earthquake in the relative area (even if not where you are), it's definitely a good idea to leave the beach.

Most people will be fine, where they are.

Perhaps the real answer is: be where you think you should be; do what you think you should do. Keep your eyes open, be practical, get prepared (if that's your thing). Relax, and do not worry or panic.