Increased volcanic unrest on Mount Ruapehu has entered its fifth week.
Scientists have reported strong tremors, gas outputs and heat flow into the crater lake.
The Lake Ruapehu crater lake temperatures are about 37C.
GNS Science said while the tremor level had varied during the past week, it remained high overall and continued to be the longest and strongest period of tremors recorded over the past 20 years.
It said the most likely outcome continued to be that no eruption would occur.
The volcanic alert remains at level two and the aviation colour code remains at yellow. Yellow means the volcano is experiencing signs of elevated unrest above known background levels.