Unlike the last eruption on August 6, the first since 1896, which rained a deadly mix of car-sized boulders and white-hot lava on to the surrounding countryside, the 1,968-metre Mount Tongariro sent just a plume of ash and steam 3 to 4 kilometres in the air.
"It was a pretty non-threatening eruption," volcanologist Tony Hurst told Radio New Zealand after about 70 hikers and tourists had left the 19.4-kilometre Tongariro Alpine Crossing, a popular trail used by thousands of walkers every year.
"There was no panic," said an eyewitness.
Police said there were no reports of injury or damage.//DPA