Tungurahua: Difference between revisions
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More quantitative data (a proper retrieval) will follow. | More quantitative data (a proper retrieval) will follow. | ||
[[File:Plot flag v3 2012121614.jpg|frame|center|IASI SO<sub>2</sub> flag over Ecuador for the orbit of 16th Dec. 2012 14 UTC. <br> | [[File:Plot flag v3 2012121614.jpg|frame|width 100px| center|IASI SO<sub>2</sub> flag over Ecuador for the orbit of 16th Dec. 2012 14 UTC. <br> | ||
The fist plot show the 'plume' pixels only = where the SO2 signal overpass a statistical threshold (of 1/10^5 false detection).<br> | The fist plot show the 'plume' pixels only = where the SO2 signal overpass a statistical threshold (of 1/10^5 false detection).<br> | ||
The second plot show the SO2 flag for all the pixels (to have an idea of where the pixels/orbit were). | The second plot show the SO2 flag for all the pixels (to have an idea of where the pixels/orbit were). | ||
Revision as of 17:26, 20 December 2012
| Tungurahua | |
|---|---|
| Elevation | 5,023 m |
| Latitude | 1° 28′ 1″ S |
| Longitude | 78° 26′ 30″ W |
Tungurahua is an active volcano in Ecuador.
Eruptions
16 December 2012
On 16 December the ash plume, generated by a large explosion, rose to a maximum height of 7 km and contained lightning. Other explosions generated ash plumes up to 2 km high. Satellite imagery showed ash plumes drifting 140 km NW, and 110 km NE at an altitude of 7.9 km a.s.l. The larger explosions during the morning were followed by pyroclastic flows that descended the SW and NW flanks.
On 17 December satellite images showed ash plumes drifting 50-130 km NE, and a dense ash plume drifting over 200 km NE at an altitude of 7 km a.s.l. IG noted that explosions continued to generate ash plumes, but with progressively decreasing ash content. Ash plumes drifted NNE and NE, causing ashfall in communities downwind.
On 17 Dec. people living on the slopes of the Tungurahua volcano were evacuated.
Here a fast look at IASI data, with ours SO2 detection flag (= a fast linear retrieval with a lot of assumptions, like the standard atmospheric profiles etc...) [1] [2]. More quantitative data (a proper retrieval) will follow.
The fist plot show the 'plume' pixels only = where the SO2 signal overpass a statistical threshold (of 1/10^5 false detection).
The second plot show the SO2 flag for all the pixels (to have an idea of where the pixels/orbit were). Credit: Dr Elisa Carboni
Sources:
Smithsonian/USGS Volcanic Activity Report
[3]
[4],
Instituto Geofísico-Escuela Politécnica Nacional (IG)
[5],
Washington Volcanic Ash Advisory Center (VAAC)
[6],
ABC News
[7]
BBC news
[8]
References
- ↑ Walker, J.C., E. Carboni, A. Dudhia, R.G. Grainger: Improved Detection of Sulphur Dioxide in Volcanic Plumes using Satellite-based Hyperspectral Infra-red Measurements: Application to the Eyjafjallaj?okull 2010 Eruption, J. Geophys. Res., 117, doi:10.1029/2011JD016810, 2012.
- ↑ Walker, J. C., Dudhia, A., & Carboni, E. (2011). An effective method for the detection of trace species demonstrated using the MetOp Infrared Atmospheric Sounding Interferometer. ATMOS MEAS TECH, 4(8), 1567-1580. doi:10.5194/amt-4-1567-2011
- ↑ http://www.volcano.si.edu/reports/usgs/
- ↑ http://www.volcano.si.edu/world/volcano.cfm?vnum=1502-08=&volpage=weekly
- ↑ http://www.igepn.edu.ec/
- ↑ http://www.ssd.noaa.gov/VAAC/messages.html
- ↑ http://abcnews.go.com/International/wireStory/ecuadors-tungurahua-volcano-prompts-evacuations-17999286#.UNM8ctHCaHc
- ↑ http://www.bbc.co.uk/news/world-latin-america-20765920