Several aftershocks rattled Christchurch on Saturday afternoon.
The first, a magnitude 4.8, struck at 4.17pm followed 10 minutes later by one measuring 3.6.
At 4.32pm a magnitude 3 quake struck 10km east of Lyttleton and a magnitude 4.1 hit at 4.48pm.
Geonet reports all four quakes were centred within 10km of Diamond Harbour, and were between 5 and 8km deep.
Two more tremors were recorded on Saturday evening in the same area, a magnitude 3.5 at 8.30pm and a 3.9 magnitude shake at 9.04pm.
