An eruption may occur at any level, and levels may not move in sequence as activity can change rapidly.
All volcanoesEruption hazards depend on the volcano and eruption style, and may include explosions, ballistics (flying rocks), pyroclastic density currents (fast moving hot ash clouds), lava flows, lava domes, landslides, ash, volcanic gases, lightning, lahars (mudflows), tsunami, and/or earthquakes.
Volcanic unrest hazards occur on and near the volcano, and may include steam eruptions, volcanic gases, earthquakes, landslides, uplift, subsidence, changes to hot springs, and/or lahars (mudflows).
Volcanic environment hazards may include hydrothermal activity, earthquakes, landslides, volcanic gases, and/or lahars (mudflows).
Since the last Volcanic Activity Bulletin on 3 August, volcanic tremor at Mt Ruapehu has decreased from moderate to weak levels. There has been minimal change in measured gas emissions as well as the temperature of Te Wai ā-moe (Ruapehu Crater Lake). Volcanic activity remains within the range typical for minor unrest. The Volcanic Alert Level therefore remains at Level 1.
During the last two weeks, volcanic tremor at Mt Ruapehu has gradually increased from weak to moderate levels. There has been minimal change in temperatures of Te Wai ā-moe (Ruapehu Crater Lake). Volcanic gas emissions continue in low-to-moderate amounts. Volcanic activity remains within the range typical for minor unrest. The Volcanic Alert Level remains at Level 1; the Aviation Colour Code remains Green.
Since the last update in late April, Mt Ruapehu has continued to show low-level unrest, characterised by persistent small earthquakes beneath the summit area, minor fluctuations in Te Wai ā-moe (Ruapehu Crater Lake) temperature, and variable but generally low-to-moderate gas emissions. Volcanic activity remains within the range typical for minor unrest. The Volcanic Alert Level therefore remains at Level 1.
Since the last Ruapehu update in February, lake temperatures and gas emissions have remained stable. We have observed a small increase in seismic activity under the summit from mid-March to early-April. No noticeable change has been observed in Crater Lake composition. The Volcanic Alert Level at Ruapehu remains at Level 1 and the Aviation Colour Code at Green.
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