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Tungurahua volcano (Ecuador) - Smithsonian / USGS Weekly Volcanic Activity Report for 30 October-5 November 2013 (New Activity / Unrest)

Wed, 30 Oct 2013, 06:00
06:00 AM | BY: VN
IG reported that, during the last week of October and the first days of November, moderate activity continued at Tungurahua; there were ~10 explosive emissions recorded. Plumes reached 800-2,000 m above the crater and drifted E and SE; ashfall was not reported from nearby communities. Seismicity included explosions, long-period earthquakes, volcano-tectonic earthquakes, and tremor (often associated with emissions).
SO2 flux measured during this time period reached a maximum of 725 tons per day. Inflation and deflation trends continued to be detected by the tiltmeter network. Since August 2012 there have been six periods of general deflation each separated by 2-3 month intervals of relative stability.

Ongoing emissions were reported by the Washington VAAC on 30 October, primarily due to elevated seismicity. On 3 November, a pilot observed an ash plume at 8.5 km a.s.l. (28,000 ft); later in the day, ash was detected by the GOES-13 weather satellite as well as the local weather observatory and pilots.
The ash plume reached 6.7 km a.s.l. (22,000 ft) and extended ~28 km SE.

During the evening of 4 November, IG observed an ash plume rising from the crater up to ~1 km a.s.l. and drifting SE. Cloudy conditions restricted observations on 5 November.

Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG), Washington Volcanic Ash Advisory Center (VAAC)
From: Global Volcanism Program, 2013. Report on Tungurahua. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 30 October-5 November 2013. Smithsonian Institution and US Geological Survey.

Previous news

Wed, 23 Oct 2013, 06:00
IG reported that activity at Tungurahua remained high during 23-27 October. Although cloud cover sometimes prevented visual observations of the crater, ash plumes were observed almost daily. During 23-24 October continuous ash emissions produced plumes that rose 3-4 km above the crater and drifted NNE and SW. ... Read all
Sat, 19 Oct 2013, 06:51
Small pyroclastic flow on the upper slope on 15 Oct (image: Pat. Mothes, IGPEN)
The eruptive phase that had started on 6 Oct, after a quiet interval of 3 months, continues to increase. The volcano observatory reports ash columns rising up to 3 km above the crater and the first occurrence (so far) small pyroclastic flows. ... Read all
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