Mt Ruapehu has been showing signs of unrest with the crater lake heating up and an increase in volcanic tremors. 

But the mountain has been on the lowest alert level since last year and will continue to stay that way. 

Scientists say while the recent disruption appears to be part of the volcano's typical behaviour cycle and it does serve as a reminder that eruptions can happen without warning. 

The last eruption was in 2007.

LIKE