Residents in Christchurch were shaken awake by a magnitude 5 earthquake in the middle of the night.
The quake struck at 2.47am this morning, 10km east of Christchurch and 9km deep, GNS science says.
It was followed by a 3.1 shortly after 4am, a 3.7 shortly after 5am and a 3.3 shortly after 7am.
Police say there have been no reports of further damage.
NZN