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Volcanoes Today, 28 Nov 2015: Batu Tara volcano, Telica, Copahue

Saturday Nov 28, 2015 11:00 AM |
Ash emission from Telica this morning
Ash emission from Telica this morning
Eruption plume from Copahue volcano this morning
Eruption plume from Copahue volcano this morning
Batu Tara (Sunda Islands, Indonesia): We just returned from a 3-days expedition to the island during 23-26 Nov: the volcano's activity was overall at similar levels as during the previous visits between 2012-June this year, but highly variable from day to day:
Phases lasting several hours, or even few days, with mild, ash-rich strombolian eruptions at intervals between 10-30 minutes alternated / were interrupted by much more powerful vulcanian-type explosions that produced shock waves and ejected dense columns of tephra (ash, blocks and incandescent lava bombs) in a single, cannon-shot like explosion. They sent ballistics to several hundred meters of height all over the upper half of the volcano. During the first two observation days, these explosions occurred at intervals between 3-10 hours, but became the dominant type of activity during the last 24 hours of our stay, when they occurred at shorter intervals of 1-2 hours typically.
... [read more]

Telica (Nicaragua): After its powerful explosion on 22 Nov, the volcano has mainly been calm, but weaker, sporadic ash emissions resumed during the past days.
It is still thought that the recent activity is only caused by over-pressurized fluids in the upper conduit, and doesn't involve new magma, but comparing with the past episodes of explosive activity in May and September this year, it is almost likely that new, potentially strong and very dangerous explosions (in particular if you climb the volcano) could follow in the near future with no or little warning.

Copahue (Chile/Argentina): Small to moderately strong ash emissions and explosions have been near continuous during the past days, creating steam/ash plumes that rise up to approx. 1 km. Overall, the volcano's activity seems to be gradually increasing.
A larger landslide occurred yesterday from the eastern flank (see comparison image, observed and submitted by reader Lynne Gulley).
Tidigare Nyheter
Thermal anomaly on the eastern side of the New SE crater (INGV Monte Cagliato thermal webcam)
Wednesday, Nov 25, 2015
Etna (Sicily, Italy): Since this afternoon there is a change visible in Etna's activity. Weak strombolian activity has started from the New SE crater. The activity probably started earlier today, but due to bad weather it was not observed before. ... [mera]
Explosion from Nishinoshima's active main vent on 17 Nov (Japan Coast Guard)
Saturday, Nov 21, 2015
Karymsky (Kamchatka): (21 Nov) Ash plumes from the volcano drifting east at estimated 23,000 ft (7 km) altitude were reported by VAAC Tokyo yesterday. ... [mera]
Glow from Etna's Voragine during a small strombolian explosion
Wednesday, Nov 18, 2015
Etna (Sicily, Italy): Strombolian activity continues in the Voragine. Hot fumaroles are visible at the New SE crater. ... [mera]
Weak ash emisson from Etna's central crater (INGV webcam)
Tuesday, Nov 17, 2015
Etna (Sicily, Italy): No significant change in activity has occurred during the past days. Degassing from the New SE crater has decreased again, probably because the magma column has dropped again, and tremor is currently low. ... [mera]
Heat signal from Karangetang volcano (MIROVA)
Sunday, Nov 15, 2015
Karangetang (Siau Island, Sangihe Islands, Indonesia): (15 Nov) Activity at the volcano has decreased a bit, judging from the overall thermal signal, but continues with slow lava extrusion and small explosions at the summit crater, generating incandescent avalanches. ... [mera]

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