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Temperatures at Mt Ruapehu's Crater Lake are on the rise, with vulcanologists issuing an alert for pilots flying over the mountain.
GNS Science said today that high water temperatures, currently about 38 - 39C, were being experienced in the lake.
GeoNet duty vulcanologist Agnes Mazot said changes had also recently occurred in volcanic gas output, seismic activity and Crater Lake water chemistry.
"These changes show that Ruapehu is experiencing signs of elevated unrest above known background levels," she said.
Despite the changes, Mazot said there were currently no indications an eruption was imminent.
Spectacular eruptions occurred during 1995 and 1996. Ruapehu had been showing signs of increased activity since late November 1994, with elevated crater lake temperatures and a series of eruptions that increased in intensity over about nine months.
Mazot said there were currently no indications an eruption was imminent.