GeoNet said on Friday, webcams at Whakatāne and Te Kaha continued to record steam and gas plumes with a "minor but variable presence of volcanic ash" over the past couple of weeks.
On occasions, small amounts of volcanic ash has been detected in the plume by satellite imagery.
"Friday's observation flight has also recorded minor changes in the active vent area, this has enlarged slightly," GeoNet said.
"We also observed impact craters, suggesting that some occasional, more explosive activity has recently occurred, ejecting ballistic blocks up to about 600m from the active vent, on the crater floor.
"The exact timing and number of these more explosive events is unknown, but this type of activity is not uncommon for Whakaari as active vents grow. The impact of these events remained confined to the Main Crater floor."
However, the Volcanic Alert Level remains at 2 and the Aviation Colour Code remains at Orange, according to GeoNet.
Whakaari/White Island is an active volcano located off the Bay of Plenty coast. In 2019, it erupted, killing 22 people.
