The GeoNet New Zealand published that the activity at the volcano continues at reduced levels.
Passive emissions of steam and ash continue at the active vent area, but at lesser intensity since 7 September.
The local observatory cited in their latest bulletin: Observations of ash has been intermittent, and the amount of ash carried in the plume is small. When we have observed ash in the plume, these periods were not accompanied by impulsive or explosive seismic or acoustic signals, hence showing no evidence of eruption.
In the case of prevailing northern winds, fresh ash deposits may occur along the Bay of Plenty coastline.
The seismic activity is characterized by a continuous low-level volcanic tremor accompanied by occasional quakes.
Satellite based ground deformation measurements continue to show a broad region of subsidence around the active vents. This may be attributed to the release of pressurized gas at depth that has fed the recently observed plumes.
Volcanic Alert Level remains at level 2 and the Aviation Colour Code remains at Yellow.
Source: GeoNet New Zealand volcano activity update 15 September 2021