The GeoNet observatory undertook visual, gas and temperature measurement flights last week as published in the latest bulletin.
Gas measurements confirmed an elevation of volcanic gases since 14 October. Sulfur dioxide (SO2) emissions increased from 267 to 681 tonnes/day. Carbon dioxide (CO2) emissions increased from 757 to 2712 tonnes/day as well as hydrogen sulfide (H2S) emission from 10 to 38 tonnes/day.
The summit vent area temperature was measured in the range between 252 °C to 202 °C during Sep-Oct while in Jul-Aug were temperatures about 500 °C-600 °C.
The crater lake level is higher than in late October due to torrential rainfall.
Small ash emissions were observed, but the recent minor ash deposits are still occurring in the area of active vents.
The low-level seismic activity continues associated with low-frequency quakes.
Volcanic Alert Level remains at level 2 and the Aviation Colour Code remains at Yellow.
Source: GeoNet New Zealand volcano activity update 8 November 2021