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Tongariro volcano (North Island, New Zealand) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 November-27 November 2012 (New Activity / Unrest)

Wed, 21 Nov 2012, 06:00
06:00 AM | BY: VN
A small eruption at Tongariro's Te Maari Craters occurred at 1325 on 21 November, without precursory events, prompting GeoNet to raise the Volcanic Alert Level to 2 and the Aviation Colour Code to Red. A report at 1730 noted that the eruption appeared to be over; the Aviation Colour Code was lowered to Orange.

The eruption occurred in the same area as the previous eruption on 6 August and lasted less than five minutes, although local seismic activity lasted about 15 minutes. GNS staff and hikers saw the eruption. An ash plume rose 3-4 km above the Upper Te Maari crater and produced ashfall across part of State Highway 46 and NE towards Turangi (21 km NE).
Two small pyroclastic density currents were produced at the base of the column, to the W and N of the crater, and traveled a limited distance of a few hundred meters downslope. Later that afternoon gas-and-steam plumes drifted SE. On 22 November a sulfur gas odor was reported in Manawatu (S) and Hawke's Bay (115 km ESE), downwind of Tongariro.
A substantial amount of gas was emitted during 22-23 November. The Aviation Colour Code was lowered to Yellow on 23 November due to the absence of emitted ash. On 26 November GeoNet noted that no further volcanic activity had occurred since the eruption, gas flux had decreased, and seismic activity remained low.

Source: GeoNet
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From: Global Volcanism Program, 2012. Report on Tongariro. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 November-27 November 2012. Smithsonian Institution and US Geological Survey.

Previous news

Thu, 15 Nov 2012, 06:52

Tongariro volcano (New Zealand): field report from 5 Nov and measurements - elevated degassing

On 5 November, GeoNet reported that several teams of scientists had been visiting Tongariro's Te Mari Craters to service portable seismometers (complementing four permanent installations), sample gas vents, and collect samples of ejecta. Read all
Sat, 10 Nov 2012, 08:58

Tongariro volcano (North Island, New Zealand) activity update

Current seismic signal from West Tongariro station (GeoNet)
Compared to most previous weeks and months, seismic activity at the volcano has been calm the past days. ... Read all
Show more
Tongariro volcano
complex volcano 1978 m / 6,490 ft
North Island, New Zealand, -39.12°S / 175.65°E
Current status: normal or dormant (1 out of 5) Tongariro volcano eruptions:
Eruptions outside Ngauruhoe, mainly on SSE flank (Red Crater): 6 Aug 2012, 1927 (?), 1926, 1896, 1890 (?), 1886, 1885±1, 1869, 1859, 1855, 1500 ± 50, 550 BC ± 200 years, 9350 BC (?), 9450 BC (?), 9650 BC (?), 9850 BC (?)
Eruptions from Ngauruhoe vent: 1975-77, 1972, 1968-69, 1962, 1958-59, 1956, 1948-54, 1939-40, 1937, 1934, 1931, 1924-28, 1917, 1913-14, 1909-10, 1904-07, 1897-98, 1892, 1883, 1881, 1878, 1875, 1869-70, 1862-64, 1857, 1844, 1841, 1839, 550 BC ± 200
Typical eruption style
explosive
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