Computer graphics (CGI) were used in the film but not as much as you would think. Instead, the director used a 1/3 scale model of the resort to depict the tsunami's destruction in the film, along...
I was curious and - after a quick Google search - learned that the eagle chicks survived the attack, and have been feasting on the remains of the hawk that had hoped to feast on them.
The Impossible seems just that
The Devil's Kettle conundrum
Intense video of hawk attacking bald eagle nest
It's Pi Day - again!