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: Activity and Crater Lake temperature update

After a recent heating cycle, we anticipated that Crater Lake (Te Wai ā-moe) would begin cooling to lower temperatures seen earlier this year. The lake reached a peak temperature of 42°C in early April and cooled to around 35°C shortly after. Recent monitoring indicates continuous gas flux which has kept the temperature around 35°C through May.

2 months ago

Mt Ruapehu: Crater Lake is now cooling again

An expected cooling trend for Crater Lake (Te Wai ā-moe) is now confirmed. The lake reached a peak temperature of 42°C in early April, and is currently at 35°C.

2 months ago

Mt Ruapehu: Crater Lake heated to 40°C

Crater Lake (Te Wai ā-moe) has been heating in response to an input of hot gases and hydrothermal fluids following volcanic earthquakes beneath Mt Ruapehu in February. The lake temperature is now 40°C. GNS Science volcanologists have collected further data to understand current activity.

4 months ago

Mt Ruapehu: Science update from seismic activity last week

Crater Lake (Te Wai ā-moe) has responded to volcanic earthquakes beneath Mt Ruapehu. GNS Science volcanologists have collected data this week to further understand current activity.

4 months ago

Mt Ruapehu: Minor seismic activity recorded

A short-lived episode of volcanic earthquakes occurred beneath Mt Ruapehu last Saturday 22 – Sunday 23 February. The earthquake episode has ended.

5 months ago

Mt Ruapehu: Continued background activity, minor volcanic unrest

Over the last 5-6 months measurements of Mt Ruapehu’s Crater Lake (Te Wai ā-moe) temperature, earthquake activity and chemistry have remained consistent with minor volcanic unrest.

6 months ago

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.

Last year

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.

Last year

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.

Last year

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.

2 years ago