GNS says there's a 50-percent chance of another eruption in the next 24 hours.

It says there's an equal chance of a smaller eruption - or no eruption.

A larger eruption is the least likely scenario - and an extremely low likelihood of ash affecting the mainland.

Senior lecturer in disaster risk and resilience Dr Tom Wilson told Simon and Phil there is a vulnerability in that volcanic system, and the risk to any recovery teams is very real. 

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