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Ruapehu volcano (North Island, New Zealand) - Smithsonian / USGS Weekly Volcanic Activity Report for 26 February-3 March 2020 (Continuing Activity)

Wed, 26 Feb 2020, 06:00
06:00 AM | BY: VN
GeoNet reported that a period of increased seismicity was detected at Ruapehu during 22-23 February. The series of volcanic earthquakes began with the largest event, a M 1.3, which was followed by smaller events. The data showed that the seismicity originated from a source 3 km below the summit.
The amplitude of the volcanic tremor declined during 24-28 February and then again increased around 29 February-1 March.



In response to the 22-23 February sequence, volcanologists collected lake water samples and measured gas emissions the week after. The temperature of the lake water suggested slow heating from 24 to 30 degrees Celsius. They observed upwelling of gray sediment and sulfur slicks on the surface of the water.
Carbon dioxide and sulfur gas emissions had increased since last measured on 7 February. GeoNet noted that gas-flux and the increased seismicity remained within the normal ranges for Ruapehu; the Volcanic Alert Level remained at 1 (minor volcanic unrest) and the Aviation Color Code remained at Green.

Source: GeoNet
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From: Global Volcanism Program, 2020. Report on Ruapehu. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 26 February-3 March 2020. Smithsonian Institution and US Geological Survey.

Previous news

Mon, 24 Feb 2020, 07:27

Ruapehu volcano (North Island, New Zealand) activity update: seismic unrest recorded since the last update

Ruapehu volcano today (image: Geonet)
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. ... Read all
Wed, 15 Jan 2020, 09:30

Ruapehu volcano (North Island, New Zealand) activity update: new seismic unrest recorded

Ruapehu volcano today (image: Geonet)
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. ... Read all
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Ruapehu volcano sat by (c) Google Earth View
Ruapehu volcano sat by (c) Google Earth View
Ruapehu volcano
Stratovolcano 2797 m / 9,176 ft
North Island (New Zealand), -39.28°S / 175.57°E
Current status: normal or dormant (1 out of 5) Ruapehu volcano eruptions:

Typical eruption style
Mildly explosive, formation of lahars
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