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'Monster earthquake' to batter New Zealand within 50 years

A new study suggests New Zealand's massive alpine fault is due for a monster earthquake within the next 50 years.

Victoria University of Wellington modelling suggests a 75 per cent chance of an earthquake of the South Island fault line in the next 50 years - most likely of magnitude 8 or higher.

The Alpine Fault runs along the South Island at the intersect of the Australian and Pacific tectonic plates, producing the mighty Southern Alps.

VUW senior lecturer Jamie Howarth has studied the past 20 Alpine Fault earthquakes by researching sediments in lakes and swamps, and says the chance of a major earthquake is much higher than previously thought.

Experts predict New Zealand's Southern Alps (pictured, behind Queenstown) region will suffer a huge earthquake within the next few decades

'From the record of past earthquakes, we can determine that the probability of a magnitude 7 or higher event is about 75 percent in the next 50 years,' he said.

'So we now know the chances of seeing a large Alpine Fault earthquake in our lifetime are better than a coin toss.

'We are therefore expecting the next earthquake to be similar to the last one in 1717, an estimated magnitude 8.1, which ruptured about 380 kilometres of the fault.'

The modelling shows the chance of the next earthquake being a magnitude 8 or higher is 82 per cent.

An Alpine Fault earthquake has preoccupied many in New Zealand, leading to a major collaborative planning group known as 'Project AF8', which aims to ready Kiwis for the aftermath of the next monster quake.

The Alpine Fault line created the Southern Alps (pictured) and is due for a major earthquake, likely magnitude 8 or higher

'We can say the next earthquake will likely happen in most of our lifetimes,' Dr Howarth said.

'We need to move beyond planning the immediate response to the next event, which has been done well through the AF8 programme, to thinking about how we make decisions about future investment to improve our infrastructure and community preparedness.'

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