Actuly you kind of get used to it after a while, we have had at least 3 aftershocks over 4 in the last 3 days since the events listed below, I only felt 2 of them, even the cat seems to freak out less nowdays;

http://en.wikipedia.org/wiki/2010_Canterbury_earthquake

http://en.wikipedia.org/wiki/February_2011_Christchurch_earthquake

 

I did a quick search but wasnt able to find an accurate answer but the last numbers I saw from memory indicated there had been over 6ooo siesmic events in the region since the 7.1 in September.

I hope your recent quake is an isolated event, they are not a pleasent thing to live with.

grief my spelling! lol