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Ruapehu volcano (North Island, New Zealand) - Smithsonian / USGS Weekly Volcanic Activity Report for 7 November-13 November 2012 (Continuing Activity)

Wed, 7 Nov 2012, 06:00
06:00 AM | BY: VN
On 5 November, GeoNet reported that Ruapehu's summit Crater Lake was hot during field visits in December 2011 and January 2012, exhibiting temperatures over 35 degrees Celsius. The lake cooled afterwards, reaching 16 degrees in May and fluctuating between 18-24 degrees during June-October. Scientists visited the lake in late October and reported that the water temperature was 19.5 degrees.
During that visit they observed weak convection near the center of the blue-green lake.

GeoNet noted that Ruapehu is often seismically active; during the last month weak volcanic tremor was recorded and more recently several small earthquakes under the volcano had been detected. The largest earthquake was an M 2.

An overflight on 26 October to measure gas flux revealed that sulfur dioxide was 63 tonnes per day and carbon dioxide was 908 tonnes per day. The Aviation Colour Code remained at Green and the Volcanic Alert Level remained at 1 (signs of volcano unrest).

Source: GeoNet
From: Global Volcanism Program, 2012. Report on Ruapehu. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 7 November-13 November 2012. Smithsonian Institution and US Geological Survey.

Previous news

Wed, 27 Apr 2011, 06:00
On 2 May, GeoNet reported that the temperature of Ruapehu's summit Crater Lake continued to slowly cool and was about 30 degrees Celsius, down from a peak of 41 degrees in March. The lake level remained below the overflow level and no earthquakes had been located within 10 km of the Crater Lake for two weeks. The Aviation Colour Code was lowered to Green and the Volcanic Alert Level remained at 1 (signs of volcano unrest). ... Read all
Wed, 20 Apr 2011, 06:00
On 18 April, GeoNet reported that the temperature of Ruapehu's summit Crater Lake was slowly cooling and decreased to 33-34 degrees Celsius from a peak of 41 degrees in March. A general decline of activity had been noted since 4 April, including lower carbon dioxide gas flux, less seismicity, modest change in the Crater Lake water chemistry, and cessation of lake overflow accompanying the start of the cooling trend. The Aviation Colour Code remained at Yellow and the Volcanic Alert Level remained at 1 (signs of volcano unrest). ... Read all
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