So, people are asking around the world why God would do such a horrible thing.
Use Occam’s Razor. God had nothing to do with it. That dispenses with all of the conflicting opinions and theories. Sometimes earthquakes happen. When they happen in the ocean, Tsunamis result. It’s happened before, and will happen again. Get over it, and quit trying to assign meaning to something when there is none. Okay, I’m done ranting.