Seismic activity at Ngauruhoe remains elevated. Measurements of temperature and volcanic gas concentrations at the summit area remain normal. We have no evidence that an eruption is imminent, but will continue to monitor the volcano closely.

Alert Status

The Volcanic Alert Level remains at Level 1.

Since our last update (3 July) the number of volcanic earthquakes recorded near Ngauruhoe has varied between approximately 5 and 30 per day. This remains above that normally recorded at Ngauruhoe, but is down slightly from the previous update.

Measurements of volcanic gas concentrations and temperatures made at the summit are of Ngauruhoe on 25 July were both normal and shoe no changes from those made on 8 June, 26 June and in 2003. The maximum fumarole temperature near the summit was 85°C. Measurements of the warm ground on the north flank also show no changes.

We have recorded no other signs of unrest at Ngauruhoe. We have no evidence that an eruption of Ngauruhoe is imminent.

We will continue to operate an additional seismograph to help monitor the earthquakes and measure volcanic gas concentrations and fumarole temperatures as necessary. We are continuing to monitor Ngauruhoe closely and will release updated information as it is available.

Brad Scott
Volcano Surveillance Co-ordinator