In my experience - what kids need most is people around them who love them and are there for them. As a parent dealing with a 12 year old struggling with the transition to a new country and new school system - I'd vote for focusing on what you can do to make the new normal as liveable as possible. When I worked on traumatic incident response for schools and ECE the key focus was to help kids get back into a pattern of normality as that helps them cope. Maybe for some families that will mean moving but for many others being in an environment where the experience is in someway shared will make it easier in the long term.
My 71 year old mother rather gently commented at the end of her update email this afternoon that she'd rather be in Christchurch than somewhere else when the aftershocks happened (she was in Wellington for the one at Queens Birthday). Even though she had said in the same email "there wasn't so much mess to clean up this time - most of it has already been broken". But it can be very hard for those of us watching and caring from afar who, seeing we can't make it stop at times, just want to have those we care for somewhere safe.