I'm under the opinion that God may have created the earth, and he may have created all of us, but he has very little to do with what happens to us from there. Sometimes God can come into someones life to build a foundation for something great, but after you have been started along your path to happiness or whatever it may be that you seek, God leaves you alone to achieve this goal yourself.
This is why I do not necesarily blame God or question if God had a hand in certain horrible things that happen on this earth. This tsunami is ultimately just a biproduct of our earth existing. It sometimes can just be the price we pay for living on this planet.
The earth is still forming and changing beneath us, and because of seismic plates and whatnot, these things happen often. Tsunami's have probably been crashing into beaches for millions of years, it just happened to be that there were people there this time, hundereds of thousands of them.
