News and activity reports about Ruapehu volcano:
Ruapehu volcano (North Island, New Zealand): lake temperature is cooling again
Monday May 04, 2020 06:53 AM | BY: MARTIN
GeoNet reported that during February-April, Crater Lake (Te Wai ā-moe) heated slowly to a peak temperature of 42ºC. Due to a heating-cooling cycle, there is a period of slow change before a cooling trend is clearly shown in the data. That trend is now confirmed with current temperatures close to 35ºC, with further slow cooling expected. Colour temperature is grey with a few surface slicks and no obvious upwelling. At that time the water level had dropped to about 30 cm below overflow but following this weekend’s rain the lake is again overflowing into the upper Whangaehu River.
Crater Lake at Ruapehu volcano (image: @geonet/twitter)
The volcanic tremor intensity is weak, as it has been during the past month. After a peak of moderate strength in early March, the tremor declined slowly, almost in parallel to the lake’s cooling trend.
The volcano is still a very active volcano with the potential of little or no warning.
Both the Volcanic Alert Level (level 1) and Aviation Code (Green) remain unchanged.
Source: GeoNet New Zealand volcano activity update 4 May 2020
Friday, Mar 20, 2020
GNS Science Volcanologists have collected water samples from Crater Lake (Te Wai ā-moe) and the temperature of the lake is now 40°C. GeoNet believe the heating of the lake is the response to an input of hot gases and hydrothermal fluids in the wake of volcanic earthquakes beneath Mt Ruapehu in February. Prior to the earthquakes, the lake measured 24ºC. ... [more]
Tuesday, Mar 03, 2020
GeoNet volcanologists have collected water samples from Crater Lake and measured volcanic gases in the plume last week. Seismic data have been analysed in detail. ... [more]
Ruapehu volcano (North Island, New Zealand) activity update: seismic unrest recorded since the last update
Monday, Feb 24, 2020
GeoNet reported that seismographs detected a sequence of seismic events beneath Mt Ruapehu during 22-23 February. GNS Science volcanologists have categorised them as volcanic earthquakes. The larger events at the start of the episode are approximately magnitude 1.5 and later, smaller events are too small to be located by GeoNet’s earthquake detection-location system. ... [more]
Wednesday, Jan 15, 2020
GeoNet reported that the activity of volcanic tremor continues at low levels. Measurements of the volcano’s Crater Lake (Te Wai ā-moe) temperature, and chemistry remained consistent in combination with seismic unrest. ... [more]
Wednesday, Apr 17, 2019
Another phase of increased crater lake temperatures has been recorded at the Te Wai ā-moe (Crater Lake) Mt Ruapehu in combination with moderate levels of volcanic tremor. ... [more]