Re: Low casualties ....
Next time, don't bother trying to get to the doorway: it's a myth:
http://www.conservation.ca.gov/index/Earthquakes/Pages/qh_earthquakes_myths.aspx
(How do I know that, here in the UK, and you don't know it in NZ?)
Drop, get under cover, hold on. If you're in bed you're probably as safe there as anywhere (unless you are foolish enough to have nearby furniture taht could topple onto you, shelves with lots of heavy ornaments, 10 foot wide framed painting over the headboard, etc.)