Ruapehu volcano (North Island, New Zealand): crater lake temperature has decreased

Mon, 28 Dec 2020, 08:27
08:27 AM | BY: MARTIN
Satellite imagery of Ruapehu volcano (image: Sentinel 2)
Satellite imagery of Ruapehu volcano (image: Sentinel 2)
Ruapehu volcano today (image: GeoNet)
Ruapehu volcano today (image: GeoNet)
GeoNet reported that the crater lake temperature has decreased since the last update. On 21 December the temperature reached a maximum of 43 °C that subsequently declined to approx. 41 °C. A lake temperature peak of approximately 40-46 °C is common during the heating-cooling cycles. The lake temperature exceeded 40 °C on at least 7 occasions since 2007. According to lake temperature decrease, estimated energy into the crater lake has decreased from 400 MW to 200 MW.
The elevated tremor continues accompanied with volcano-tectonic earthquakes. The largest earthquake with magnitude M 2.2 located under the volcano occurred on 26 December. Volcanic earthquakes of this size are uncommon and the combination with elevated tremor and still high lake temperature indicate moderate to heightened volcanic unrest.
The Volcanic Alert Level remains at Level 2.
Source: GeoNet New Zealand volcano activity update 28 December 2020

Previous news

Wed, 23 Dec 2020, 06:00
On 28 December GeoNet reported that during the previous week the temperature of Ruapehu's crater lake water slightly decreased from 43 to 41 degrees Celsius. Moderate-to-strong levels of volcanic tremor were recorded along with a small number of shallow volcanic earthquakes. The largest volcanic earthquake was an M 2.2 (on 26 December) which was uncommonly large, and combined with elevated tremor indicated ongoing unrest. ... Read all
Tue, 22 Dec 2020, 11:26
Aerial view of Crater Lake at Ruapehu volcano (image: GeoNet)
GeoNet reported that Crater Lake (Te Wai ā-moe) temperature has been rising and is now 43ºC. During a gas flight last week, the lake was observed to be a uniform grey colour which shows it is well-mixed. The gas output through the crater lake has also increased markedly in response to this heating cycle. The amounts of carbon dioxide (CO2) and sulphur gases (SO2 and H2S) in the plume are the largest measured in the past two decades. The continued flow of gases and hydrothermal fluids though the lake shows that the underlying vent area is open. ... Read all
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