Pay attention to the trees when he's shooting at the end. They 'move' when there is an explosion nearby (like in Crysis 1. Funny thing that this feature is not in Crysis 2, right?
). Although I fear the earthquake was just a scripted event and we won't get these physics in real-time situations (and Crysis 2 has amazing scripted events but the real-time physics were... meh)