The original quake, now upgraded to 7.8 magnitude, struck just after midnight about 90 kilometres north-east of Christchurch.
There are reports of more injuries, along with damaged roads and buildings.
Major aftershock rattles New Zealand's South Island
Các thùng hàng xô lệch nhau tại Centre Point ở Wellington Source: AAP
A strong, new 6.2-magnitude earthquake has shaken New Zealand's South Island, hours after a more powerful quake killed at least two people and sent thousands fleeing to higher ground.
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