There is a 32 percent chance of another earthquake with a magnitude of more than seven within the next month, GNS says.
New Zealand Crown Research Institute for geophysics and nuclear science, GNS Science said there had been more than 800 aftershocks since the 7.5 magnitude earthquake rocked the country yesterday.
Most have been centred 10km to 20km east of the Marlborough town of Seddon, but several strong aftershocks have struck close to the centre of Kaikoura.
GNS duty seismologist Natalie Balfour told Morning Report three 'severe' category quakes struck last night, measuring as high as 5.8.
"We've had about 832 was our last update of aftershocks since the main event," she said.
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What was becoming obvious was New Zealand was moving into a period of more earthquakes, he said.
"There's been periods in history - and most of us grew up in the period of 50 years or so when there was hardly any large earthquakes - our parents grew up when there was a lot of large earthquakes in through the '20s and '40s."
