Whakaari ash plume prompts volcanic alert increase; coastal haze possible

Bay of Plenty residents might notice subtle changes in the air quality in the coming days, as scientists monitoring Whakaari/White Island have observed a gradual increase in volcanic activity. This shift has prompted GNS Science to raise the Volcanic Alert Level to 3, though the Aviation Colour Code remains at Orange for now.

Over the past few months, satellites and distant webcams have increasingly captured traces of volcanic ash mingling within the usual steam and gas plume emanating from the island.

Officials at New Zealand MetService have also detected these fine particles drifting in the upper atmosphere. From the coastline, particularly during northerly winds, this may manifest as a slight haze in the sky, accompanied by the distinct odour of sulfur carried on the breeze.


While these observations indicate a heightened state of activity beneath Whakaari, with evidence of intermittent, minor explosive events within the crater itself, experts emphasize that significant ashfall along the Bay of Plenty coastline is not currently anticipated.

Duty volcanologist Geoff Kilgour assures residents that the ash emissions remain relatively low.

The increase in ash and sulfur dioxide detected through remote monitoring – including satellite imagery and occasional gas flights – suggests a subtle but persistent build-up of pressure within the volcano.

This can lead to these small bursts of activity, a common occurrence in active volcanic systems like Whakaari.

Due to the lack of on-site monitoring equipment since the tragic events of 2019, scientists are relying heavily on these remote tools to track the volcano's behaviour.

The current Volcanic Alert Level reflects both the observed increase in activity and the inherent uncertainty that comes with this remote monitoring approach.

The GNS Science Volcano Monitoring Group and the National Geohazards Monitoring Centre will continue their diligent watch over Whakaari/White Island, analyzing every wisp of steam and trace of gas.

Residents are advised to stay informed through official channels, as further updates will be provided as new information becomes available. For now, be aware of potential hazy skies and sulfurous smells.