GeoNet said analysis of webcam images and satellite imagery from MetService suggested the likelihood of significant volcanic ash in the plume was minor.
After about 30 minutes, the plume returned to a more typical altitude of about 1km or less.
“While the plume was highly visible from afar, this does not reflect a significant change of activity at the volcano,” Jarvis said.
“The height that a volcanic plume can reach is determined by a combination of the volcanic activity and atmospheric conditions.”
Bay of Plenty currently has a severe thunderstorm watch, which affects how easily volcanic plumes rise through the atmosphere.
“Given the current atmospheric conditions and the volcanic activity level over recent weeks, it is possible further visibly impressive plumes may be observed,” Jarvis said.
If wind blows the plume towards the Bay of Plenty coast, residents may smell sulphur odours.
“However, at the current level of activity, there is a very low likelihood of ash falling to the ground at the coast,” Jarvis said. “The level of volcanic activity would have to escalate significantly for this likelihood to increase.”
GeoNet monitors the island by remote cameras, satellite imagery and periodic observation, and gas flights.
– RNZ
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