Mt Ruapehu has been kept at volcanic alert level 2 as temperatures at its crater lake continue to rise.
Over the past eight days, the temperature at Mt Ruapehu's Crater Lake Te Wai ā-moe has risen further from 32C to 36C. Last month, Mt Ruapehu was moved to volcanic alert level 2 following rising temperatures at its crater lake.
GeoNet says the modelling suggests that the temperature rise corresponds to about 460 MW of heat entering the lake.
While analysis of the lake water and gas samples do not indicate significant changes, the amount of gas being released has increased but remains within observed long term trends.
The colour of the crater lake has also changed to what GeoNet has called a "battleship grey" colour as upwelling waters have disturbed sediments on the lake floor.