Volcanic Alert Bulletins

Volcano Alert Bulletins (VABs) are New Zealand's official source of volcano status information including the current Volcanic Alert Level (VAL). They are issued on an as needed basis summarising the volcano status and recent events. They can indicate if activity is increasing, decreasing, or in a steady state. They may contain forecasts, highlight developing, or expected problems.
If you’d like to be notified as soon as we issue a new bulletin, our social media channels and the GeoNet app will keep you up-to-date.



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Mt Ruapehu crater lake (Te Wai ā-moe) is in a new heating cycle

The temperature of Mt Ruapehu’s summit lake Te Wai ā-moe is slowly rising, but no other changes in monitored parameters have been observed.

3 months ago

Te Wai ā-moe, Mt Ruapehu crater lake is starting to cool and seismic activity decreases.

The period of high lake temperatures at Te Wai ā-moe (Crater Lake), Mt Ruapehu along with moderate levels of volcanic tremor has now passed. We are now moving away from a range of higher probability of eruption in this heating phase. The Volcanic Alert Level remains at 1.

7 months ago

Te Wai ā-moe, Mt Ruapehu: Increases in lake temperature and seismic activity

We are recording another phase of high lake temperatures at Te Wai ā-moe (Crater Lake), Mt Ruapehu along with moderate levels of volcanic tremor. The Volcanic Alert Level remains at 1.

7 months ago

A new heating cycle begins at Mt Ruapehu

Te Wai ā-moe (Crater Lake) temperature at Mt Ruapehu is rising along with an increase in volcanic tremor. This is consistent with minor volcanic unrest behaviour. The Volcanic Alert Level remains at 1.

Last year

Minor seismic sequence over at Mt Ruapehu

The episode of volcanic earthquakes beneath Mt Ruapehu has ended, and observations and models indicate the heating phase of the Crater Lake (Te Wai ā-moe) has likewise ended.

Last year

Slight increase in seismic activity at Mt Ruapehu

An episode of volcanic earthquakes is occurring beneath Mt Ruapehu since 15 March. This is a common observation during a heating phase of the crater lake (Te Wai ā-moe).

Last year

Gas emission at Mt Ruapehu returns to normal

Carbon Dioxide (CO2) gas emission rates at Mt Ruapehu have returned to a more normal level. The period of slightly higher volcanic unrest appears to have ended. The Volcanic Alert Level remains at 1.

Last year

Slight changes in water and gas composition of the Crater Lake (Te Wai Ā-Moe) at Mt Ruapehu

Measured changes in Crater Lake water and gas composition confirm the slightly elevated level of activity at Mt Ruapehu. The lake temperature (37ºC) and the level of seismic tremor remain unchanged. The Volcanic Alert Level remains at 1.

2 years ago

High volcanic gas emission and Crater Lake (Te Wai Ā-Moe) temperature at Mt Ruapehu

An increase in volcanic gas emissions and sustained high lake temperature suggest a slightly higher level of activity at Mt Ruapehu. The Volcanic Alert Level remains at 1.

2 years ago

Mt Ruapehu: Seismic activity increases after lake temperature peaks.

Since early September, Mt Ruapehu’s Crater Lake had been heating at a rate of around 1°C per day, reaching a maximum of 40ºC on October 4. The lake temperature has cooled slightly since then and is now hovering around 37°C. After October 18, the level of volcanic tremor under Mt Ruapehu increased in strength. Volcanic tremor is always present at Mt Ruapehu, however the level can vary.

3 years ago