As far as first aid goes, I would think that you'd mostly encounter a lot of lacerations, bruises, abrasions, and fractures among survivors. That tsunami is going to pick up people and debris and just turn into a giant meat grinder, smashing everything together before finally receding. Maybe major blunt force trauma to the head, but that's not something you can do much about in the field.

It's possible you may encounter quite a few injured, so you should gird yourself for the possibility of doing some triage and having to decide whom to treat first. Not that I've ever had to do that, but that could be pretty tough to do. I've had a bit of triage training, but really, could I pass up a kid? That's a tough one.