Rain and strong winds battered central New Zealand on Thursday, threatening further damage just days after a powerful earthquake killed two people and devastated parts of the country's South Island with huge landslides.

More than 1,000 tourists and residents have been evacuated from the small seaside town of Kaikoura by a fleet of helicopters and a New Zealand naval vessel since the 7.8 magnitude quake struck early on Monday.

Kaikoura, a fishing town and popular whale-watching base ringed by steep mountains, was completely cut off by landslides covering the coastal road and rail corridor.