Ruapehu volcano (North Island, New Zealand) - Smithsonian / USGS Weekly Volcanic Activity Report for 23 December-29 December 2020 (New Activity / Unrest)
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.
Wed, 23 Dec 2020, 06:0006:00 AM | BY: VN
The Volcanic Alert Level remained at 2 and the Aviation Color Code remained at Yellow.
From: Global Volcanism Program, 2020. Report on Ruapehu. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 23 December-29 December 2020. Smithsonian Institution and US Geological Survey.
Tue, 22 Dec 2020, 11:26
Ruapehu volcano (North Island, New Zealand): Volcanic Alert Level raised to Level 2; crater lake heating to over 40°C
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
Wed, 16 Dec 2020, 06:00
Ruapehu volcano (North Island, New Zealand) - Smithsonian / USGS Weekly Volcanic Activity Report for 16 December-22 December 2020 (New Activity / Unrest)
GeoNet reported a warming trend of the crater lake water at Ruapehu, with a high temperature of 43 degrees Celsius. During an overflight to measure gas emissions the previous week, scientists observed that the lake was a uniform gray color (suggesting it is well mixed) and some water overflow at the lake's outlet. Gas output had increased in response to the heating cycle; the amounts of carbon dioxide (CO2) and sulfur gases (SO2 and H2S) in the plume were the largest measured in the past two decades. ... Read all