Tongariro is a complex of multiple volcanic cones constructed over a period of 275,000 years. The active vents include Te Māri, Emerald Lakes, North Crater and Red Crater. There have been five reported eruptions from the Te Māri craters between 1855 and 1897 but they have been dormant until 2012.
Most Recent Eruption
Tongariro erupted twice in 2012 (6 August and 21 November) at Te Māri.
- Where: Te Māri
- When: 1869, 1892, 1896 and 1897
- Effects: In 1869 a large eruption (accompanied by an earthquake) formed the upper Te Māri Crater during an explosive eruption. Māori descriptions talk of "bright red flame through the smoke that would burst and fall like snow". In November 1892 Te Māri again belched forth an immense quantity of steam, mud and boulders; the ejected material rose 2,000 - 3,000 feet (600 - 900 m) before rushing down the mountain side. The last eruption began in November 1896 and activity lasted until October 1897.
Last Volcanic Alert Bulletins
Blog: Volcanic unrest at Mt Tongariro is over - Volcanic Alert Level lowered to Level 0
Aug 19, 2015
Blog: Volcanic Alert Bulletin TON-2013/05 - Tongariro Volcano
Dec 23, 2013
Blog: Volcanic Alert Bulletin TON-2013/04 - Tongariro Volcano
Aug 06, 2013
What does GeoNet do?
- Visual Observations: 2 web cameras facing the northern flank of Tongariro and Te Māri Crater.
- Seismic Monitoring: 5 seismographs and 3 microphones to detect volcanic explosions.
- Chemical Analysis: Water and gas chemistry, and both airborne and vehicle-based gas measurements.
- Ground Deformation: 5 continuous GPS (cGPS) stations.