Alsion Ballance revisits a story looking at the complexity of the 2016 Kaikōura earthquake.

After more than 12 years as host of Our Changing World, Alison Ballance is diving into the archives in search of some golden oldies.

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This week's theme is 'the big one'.

The magnitude 7.8 Kaikōura earthquake in 2016 had a big impact on the landscape and communities of North Canterbury and Marlborough.

It also shook up the science community, which responded quickly to study and understand what was described as a 'very complex earthquake.'

Check out the original story from May 2017, to see photos and read more about the earthquake.

Go to this episode on rnz.co.nz for more details