Tungurahua volcano news & eruption updates:
IG reported that during 21-28 November, emissions from Tungurahua produced ash and steam plumes that reached altitudes of 6-9 km (19,700-29,500 ft) a.s.l. and drifted predominantly NW and W. Ashfall about 1 mm thick was reported from areas 8 km WSW on 21 November and from areas 8 km W on 25 November.
During 26-27 November, Strombolian activity propelled incandescent material up to 600 m above the summit. Blocks rolled 2 km down the flanks. Lightning was visible in an ash plume that reached 7 km (23,000 ft) a.s.l. and ashfall was reported from areas 8 km WSW. On 27 November, an ash plume rose to 9 km (29,500 ft) a.s.l. and drifted W.
IG reported that lahars from Tungurahua traveled NW down the gorges of Vazcún and Mandur on 14 and 15 November, respectively. During 16-19 November, emissions produced gas plumes with minor ash content that reached altitudes of 5.2-5.5 km (17,100-18,000 ft) a.s.l. On 17 November, an ash plume reached an altitude greater than 10 km (32,800 ft) a.s.l. and drifted NW and NE....more
Tungurahua continues to be one of the most active volcanoes at the moment.
IG reported that during 7-12 November, emissions from Tungurahua produced ash plumes that reached altitudes of 6-9 km (19,700-29,500 ft) a.s.l. and drifted predominantly NE, NW, and W. On 7 November, a voluminous lahar traveled down gorges to the W and reached as far as the Chambo River, about 7 km from the summit. On 8 November, blocks expelled from the summit rolled down the flanks and ash fall was reported from areas including Casúa (7 km NW) and Baños (8 km NE). On 10, 11, and 13 November, ash fall was reported from areas including Penipe (8 km SW). During 12-13 November, lahars traveled down W and NW drainages and the Vazcún River swelled with muddy water.
Over the past weeks, weak to moderate activity continued at Tungurahua volcano. A number of smaller explosions produced plumes consisting of steam, gas, and moderate ash that reached altitudes of 1-3 km (3,300-9,800 ft) a.s.l. and drifted in multiple directions.
On 2 November incandescent blocks were expelled from the summit and rolled about 700 m down the W and E flanks. Nighttime incandescence was observed during 2-4 November.
On 6 November, ash plumes rose to 6 km (19,700 ft) a.s.l. and drifted NW. Ashfall was reported from several towns downwind of the plumes on 5 and 6 November, including Bilbao (8 km W), Cotaló (13 km NW), and Manzano (8 km SW).
Tungurahua had a series of strong eruptions on the afternoon and evening of 18 October 2006. Lava fountains up to 1000 m height were observed. An associated as plumes rose to 8-10 km, visible on satellite images, and ballistic bombs were ejected to distances of 800 m of the crater. Westerly winds caused strong ash fall in the sector of Puyo east of the volcano.
During the night of 18-19 Oct, activity decreased again, but as a precaution, 300 people from nearby villages are reported evacuated.
On the morning of 23 Sept, an ash plume emitted by a strong explosion of Tungurahua volcano reached an altitude of 9 km a.s.l. (VAAC Washington). The geophysical institute of Ecuador reports increased levels of tremor and sulphur dioxide emission.
During 19-25 July, smaller to medium-sized explosions continued at Tungurahua volcano. Small pyroclastic flows descended NW a maximum distance of 1 km on 21 and 23 July. Steam-and-ash plumes were observed during 19-22 and 24 July and reached maximum heights of 5 km above the summit (32,900 ft a.s.l.) on 21 July. According to the Washington VAAC, pilots reported on 19, 22, and 23 July that ash plumes reached altitudes of 10.7 km (35,000 ft) a.s.l. and drifted predominantly W. A hot spot was visible on satellite imagery from 19 to 22 July....more
Tungurahua remains highly active, with large strombolian-vulcanian explosions and pyroclastic flows. Ash clouds reach 6-10 km altitude....more
On July 14, Tunguragua volcano's activity increased dramatically and culminated in a powerful vulcanian-type explosion starting at 17h30 local time. It produced an visible eruption column of 6-15 km height, with an ash plume reaching 25 km altitude, ash and pumic falls in the surrounding areas as well as several pyroclastic flows. The activity is the most intense since the volcano started its present eruptive phase in 1999.
Tungurahua's increase in activity started on July 14, at 17h10 local time, when a number of loud detonations were heard up to several kilometers distance. A calm period of 20 minutes followed until the volcano suddenly entered its violent explosive phase at 17h30 that lasted until 00h30. This phase of the eruption eruption was characterized by intense strombolian activity ejecting large incandescent blocks to about 500 m above the crater, the generation of at least 4 or 5 pyroclastic flows that descended the Achupashal, Cusúa, la Hacienda and Juive Grande valleys on the W and NW slopes causing small bush fires, continuous ash explosions with a sustained eruption column of 6-15 km height. A part of the ash plume reached 25 km altitude as satellite observations indicate. Two ash clouds travelling at 7 and 25 km altitudes were moving E and SE and by the time of this report had already exited Ecuadorian territory.
Ash and pumice falls, with fragments of up to 1 cm in diameter, fell in areas W of the volcano, with maximum measured thickness of 15mm. Strong seismic activity was felt in areas up to 14 km north of the volcano.
The deposits of one of the pyroclastic flows were described as 8m thick and 20m wide and composed of dense rock fragments, thus suggesting their origin as from "boiling-over" of fresh lava from the crater rather than column collapse.
After 00h30 local time, the intensity of the eruption ceased and changed to intermittent, but still very powerful explosions, occurring at more or less regular intervals of 30-40 minutes.
Tungurahua volcano continues to be in strombolian eruption. The Istituto de Geofisica of Quito reports several hundreds of explosions per day producing ash plumes 500-1,500 m of height. At night, incandescent ejecta are seen above the crater and loud detonations rattle windows of houses in nearby villages.