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==Eruptions==
==Eruptions==
===6 August 2012 11:52 NZST===
===6 August 2012 23:52 NZST (6 August 2012 10:52 GMT)===
After a couple of weeks of increased earthquake activity and changes in gas emission, Mount Tongariro had a phreatic (gas and steam driven) eruption on Monday 6 August 2012 at 11.52 pm NZST. The eruption lasted only a couple of minutes and occurred partly from existing vents at the Upper Te Maari Crater.<ref>http://www.gns.cri.nz/Home/Learning/Science-Topics/Volcanoes/New-Zealand-Volcanoes/Tongariro/Eruption-6-August-2012</ref>
After a couple of weeks of increased earthquake activity and changes in gas emission, Mount Tongariro had a phreatic (gas and steam driven) eruption on Monday 6 August 2012 at 11.52 pm NZST. The eruption lasted only a couple of minutes and occurred partly from existing vents at the Upper Te Maari Crater.<ref>http://www.gns.cri.nz/Home/Learning/Science-Topics/Volcanoes/New-Zealand-Volcanoes/Tongariro/Eruption-6-August-2012</ref>


===21 November 2012 1:24:50 NZST===
===21 November 2012 13:24:50 NZDT (21 November 2012 00:24:50 GMT)===
On the 21 November 2012 an eruption of the Upper Te Maari crater ejected ash to a height of 3-4 km.  the eruption lasted approx 5 min.<ref>http://www.gns.cri.nz/Home/Learning/Science-Topics/Volcanoes/New-Zealand-Volcanoes/Tongariro/Tongariro-latest</ref> A nearby walking party took a video of the eruption showing the rapid ascent of the ash plume.<ref>http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=10849136</ref><ref group="F">The Herald article gives the time of eruption as "just before 1.30pm" failing to observe that that GNS reports time in NZST.</ref> The eruption was measured by GNS who produced a Tongariro eruption time series.
At 1:24 pm NZDT on the 21 November 2012 an eruption of the Upper Te Maari crater ejected ash to a height of 3-4 km.  the eruption lasted approx 5 min.<ref>http://www.gns.cri.nz/Home/Learning/Science-Topics/Volcanoes/New-Zealand-Volcanoes/Tongariro/Tongariro-latest</ref> A nearby walking party took a video of the eruption showing the rapid ascent of the ash plume.<ref>http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=10849136</ref> The eruption was measured by GNS who produced a Tongariro eruption time series.


[[File:Prova newzeal-2012112209.jpg|frame|center|IASI SO<sub>2</sub> anomaly flag for X November 2012at XX.XX GMT. ''Credit: Dr Elisa Carboni'']]
[[File:Prova newzeal-2012112209.jpg|frame|center|IASI SO<sub>2</sub> anomaly flag for 22 November 2012 at 9 GMT. ''Credit: Dr Elisa Carboni'']]


The SO<sub>2</sub> anomaly flag <ref>Carboni, E., R.G. Grainger, J.C. Walker, A. Dudhia and R. Siddans, A new scheme for sulphur dioxide retrieval from IASI measurements: application to the Eyjafjallajökull eruption of April and May 2010, Atmospheric Chemistry and Physics, 12, 11417—11434, 2012.</ref> for [[IASI]] overpass at X.X on the X November shows four anomalous pixels surrounding the location of Mt Tongariro.  The SO<sub>2</sub> had passed below the dectable limit by the time of the next overpass at Y.Y.
The SO<sub>2</sub> anomaly flag  
 
<ref>Carboni, E., R.G. Grainger, J.C. Walker, A. Dudhia and R. Siddans, A new scheme for sulphur dioxide retrieval from IASI measurements: application to the Eyjafjallajökull eruption of April and May 2010, Atmospheric Chemistry and Physics, 12, 11417—11434, 2012.</ref>  
==Footnotes [F]==
for [[IASI]] overpass at 9 UTC on the 22 November shows four anomalous pixels surrounding the location of Mt Tongariro.   
{{reflist|group=F}}
The SO<sub>2</sub> had passed below the dectable limit by the time of the next overpass at 20 UTC.


==References==
==References==

Latest revision as of 23:59, 14 December 2012

Tongariro
Elevation 1978 m
Latitude 39° 08′ 00″ S
Longitude 175° 38′ 30″ E

Tongariro is a compound volcano in the Taupo Volcanic Zone of the North Island of New Zealand.

Eruptions

6 August 2012 23:52 NZST (6 August 2012 10:52 GMT)

After a couple of weeks of increased earthquake activity and changes in gas emission, Mount Tongariro had a phreatic (gas and steam driven) eruption on Monday 6 August 2012 at 11.52 pm NZST. The eruption lasted only a couple of minutes and occurred partly from existing vents at the Upper Te Maari Crater.[1]

21 November 2012 13:24:50 NZDT (21 November 2012 00:24:50 GMT)

At 1:24 pm NZDT on the 21 November 2012 an eruption of the Upper Te Maari crater ejected ash to a height of 3-4 km. the eruption lasted approx 5 min.[2] A nearby walking party took a video of the eruption showing the rapid ascent of the ash plume.[3] The eruption was measured by GNS who produced a Tongariro eruption time series.

IASI SO2 anomaly flag for 22 November 2012 at 9 GMT. Credit: Dr Elisa Carboni

The SO2 anomaly flag [4] for IASI overpass at 9 UTC on the 22 November shows four anomalous pixels surrounding the location of Mt Tongariro. The SO2 had passed below the dectable limit by the time of the next overpass at 20 UTC.

References

  1. ↑ http://www.gns.cri.nz/Home/Learning/Science-Topics/Volcanoes/New-Zealand-Volcanoes/Tongariro/Eruption-6-August-2012
  2. ↑ http://www.gns.cri.nz/Home/Learning/Science-Topics/Volcanoes/New-Zealand-Volcanoes/Tongariro/Tongariro-latest
  3. ↑ http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=10849136
  4. ↑ Carboni, E., R.G. Grainger, J.C. Walker, A. Dudhia and R. Siddans, A new scheme for sulphur dioxide retrieval from IASI measurements: application to the Eyjafjallajökull eruption of April and May 2010, Atmospheric Chemistry and Physics, 12, 11417—11434, 2012.
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