A powerful 7.8-magnitude earthquake killed two people and caused "utter devastation" in New Zealand today, with wild weather hampering rescue efforts as darkness fell.
The tremor, one of the most powerful ever recorded in the quake-prone South Pacific nation, hit just after midnight near the South Island seaside tourist town of Kaikoura.
It triggered a tsunami alert that sent thousands of coastal residents fleeing for higher ground across much of the country.
Kaikoura, a town of about 2,000 people popular with international backpackers, was completely isolated, with telecommunications down and huge landslides cutting all access roads.
Civil Defence Minister Gerry Brownlee said rescuers had to travel in by helicopter to slowly build up a clear picture of the damage.
"I think had there been serious injury or suspected further loss of life, then we would have heard about it by now," he told Radio New Zealand.
He added: "It looks as though it's the infrastructure that's the biggest problem, although I don't want to take away from the suffering... And terrible fright so many people have had."
Brownlee and Prime Minister John Key flew over the affected area in a military helicopter.
"It's just utter devastation... Months of (repair) work," Key remarked as he surveyed the landslips that dumped hundreds of tonnes of rocky debris on the main highway.
Aerial footage outside Kaikoura showed railway tracks ripped up and tossed 10 metres by the force of the quake, while locals posted pictures of themselves near huge fissures that opened up in roads.
One person was believed to have died at a historic homestead that collapsed at the town, while police were trying to reach the scene of a fatality at a remote property north of Christchurch.
As hundreds of people prepared to spend the night in evacuation centres, rescue workers were facing deteriorating weather conditions.
Heavy rain increased the risk of more landslides and strong winds made clean-up work hazardous.
The treacherous conditions temporarily blocked the Clarence River with debris, which then shifted to release a "wall of water" downstream and force more evacuations.
The earthquake struck at 12:02am today (local time) and was 23 kilometres deep, the US Geological Survey said.
It was felt across most of the country, causing severe shaking in the capital Wellington, about 250 kilometres away.
The quake ignited painful memories for residents in nearby Christchurch, which was devastated five years ago by a 6.3 tremor that killed 185 people.
Key said he was well aware its impact could have been much worse.
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