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Ngauruhoe volcanoNgauruhoe (pronouned "Nauruhó"), a steep 600 m tall stratovolcano 17 km NNE of Ruhapehu volcano, is the main vent of Tongariro volcano and one of New Zealand's most active volcanoes. Its last eruptive phase in 1975-77 produced violent ash explosions, lava fountains and pyroclastic flows. In its recent past, Ngauruhoe has been erupting around every 10 years and the time lapsed since then makes this the longest repose interval known in its recorded history.
Background:Ngauruhoe is the youngest and most active cone of the large Tongariro volcanic complex, and forms today its highest peak. Ngauruhoe started to grow about 2500 years ago and has been frequently active in historic times.
1975 eruption of Ngauruhoe
The eruption in February 1975 was the strongest since the lava flows from 1975. It produced violent explosions with ash plumes up to 11k m height and pyroclastic flows. ...more
2006 earthquake swarm
In June 2006, earthquakes under the volcano increased in number to about 50 per day and were located only 1 km beneath the summit. Ngauruhoe was raised to alert level 1, because the earthakes likely indicated an intrusion of new magma at shallow depth, which could have resulted in a possible eruption in the near future. However, no eruption followed and seismicity returned to its normal level.