Experts have lowered the aviation colour code to yellow, a week after the volcanic alert level was lowered to level two.
Following an eruption two weeks ago, Earth Sciences New Zealand Duty Volcanologist Paul Jarvis said no further ash has been detected.
An observatory flight on Saturday found there was a weak plume of steam rising above the island, but no further ash was observed.
"There was no evidence of any new ashfall on the island or ballistic blocks in the crater floor."
"Images captured using our thermal camera showed that maximum vent temperatures were about 100ºC," he said.
While the volcano is not actively erupting, he said volcanic activity could esculate with little to no warning.
"Future eruptions could affect the crater floor and immediate vicinity of the island, although ashfall affecting the
mainland remains unlikely."
Experts will continue to monitor the island for any changes in activity.
This follows a month of volcanic unrest, which has seen the alert level raised twice since the beginning of March.
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