Volcanic activity worldwide 25 Nov 2014: Bardarbunga volcano, Zhupanovsky, Fogo, Shiveluch, Dukono, Aso
mardi nov. 25, 2014 16:17 |
Earthquakes and subsidence of the Bardarbunga caldera since 12 Sep (Icelandic Met Office)
Lava flows at Fogo (credit: Landsat image on Google Earth / Peter Webley)
NASA satellite image of the ash plume from Shiveluch volcano on 23 Nov 2014 (NASA Earth Observatory)
Bardarbunga (Iceland): The eruption at Holuhraun continues strongly. The only apparent change is that during the past days, the intensity of lava output seems to be less stable and fluctuating.
Terra satellite image showing this morning's eruption at Zhupanovsky volcano
It is thought that most of the magma comes from decompressing mantle material at approx. 10 km depth, i.e. directly from the Icelandic hot spot. The observed fluctuations could (but not necessarily does) mean that the magma supply has starting to decrease overall and/or that the dyke started to close up.
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Fogo (Cape Verde): (24 Nov) The recent eruption of the Pico do Fogo continues to produce lava fountains from two vents on the volcano's flank. The erupted lava collects in rapidly growing flows that destroy roads and houses near the caldera, as shown in the new BBC footage below.
Fortunately, this new eruption has not yet made any casualties, but many locals are forced to abandon there homes and move to houses constructed for the refugees of the 1995 eruption or to newly constructed temporary shelter. A large ash plume can be seen from Praia, the capital of Cape Verde on one of the neighbouring islands. The eruption also caused the closure of the local airport.
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The eruption continues with little changes. Lava fountaining from the new vents feeds two main lava flows inside the Cha caldera, one to the south, the other to the north.
The attached LANDSAT-8 satellite image from yesterday used as overlay on google earth shows the location of active flows as of yesterday (source: Peter Webley's blog Volcanic Activity in the North Pacific and beyond).
Shiveluch (Kamchatka): A strong vulcanian explosion occurred on Sunday, sending an ash plume to an altitude of approx. 8 km above the volcano.
No pyroclastic flows seem to have been produced by the explosion. The plume spread eastwards and could be seen extending for more than 200 km distance.
Zhupanovsky (Kamchatka, Russia): A strong explosion occurred at 00:15 UTC at the volcano. A plume rose to approx. 27,000 ft (8 km) altitude.
A satellite image taken 10 minutes after the start of the eruption nicely shows the plume from above and its shadow on the ground.
Aso (Kyushu): A small explosion or ash emission was reported from the volcano at 03:00 UTC (noon local time in Japan) via VAAC Tokyo.
Cloud cover prevented visual observations on webcams.
Dukono (Halmahera): Significant ash emissions continue from the volcano.
VAAC Darwin reported an ash plume at estimated 8,000 ft (2.4 km) altitude extending 80 nautical miles to the NE from Dukono.
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