The Canterbury HealthInfo web site has earthquake related health information of a practical nature. The website is here.
Two health issues of wide interest are covered:
Information about getting to the hospital: Parking, Shuttles, and Inter-hospital Transport is here.
There is a request on the page to not use the hospital one way system because congestion is interfering with ambulances trying to enter and leave the hospital. Note that parking close by is unlikely and that up to 30 minutes walk can be expected to get from the car to the hospital. Check the page for the latest situation.