A series of short-lived, low-energy steam explosions have occurred on Whakaari/White Island today.
The explosions took place over about 100 minutes following a small increase in volcanic tremor levels, GNS Science said in a statement.
The Volcanic Alert Level remains at 1.
GNS Science volcanologist Brad Scott said the small events did not appear to have produced any traces of ash locally and, since the event, activity had returned to a low level.
"Starting at around 2.20am today our seismic and acoustic [air pressure] sensors at Whakaari/White Island detected a series of small steam explosions.