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Nishino-Shima volcano (Izu Islands, Japan): ash plumes from explosive activity

So, 26. Jan 2014, 11:52
11:52 AM | VON: T
The former new island off Nishino-Shima seen on 20 Jan 2014(Japan Coast guard)
The former new island off Nishino-Shima seen on 20 Jan 2014(Japan Coast guard)
Map showing the evolution of the new island between 21 Nov (shortly after its birth), 26 Dec (touching the main island) and 20 Jan 2014
Map showing the evolution of the new island between 21 Nov (shortly after its birth), 26 Dec (touching the main island) and 20 Jan 2014
The 2 active vents of Niishima (the left one showing spattering of liquid lava) and an active flow
The 2 active vents of Niishima (the left one showing spattering of liquid lava) and an active flow
The volcano continues to enlarge the island with lava flows, but seems to have increasingly explosive activity as well. Ash plumes to altitudes of 4,000 ft (1.2 km) were reported during the past days. These could have originated from more violent water-magma interaction (phreatomagmatic activity) or simply stronger strombolian explosions.
As recent imagery by the Japanese Coast guard shows, new lava flows continued to effuse at low rate and slowly increase the size of what started as a new island, now merged and surpassed in size the older Nishino-Shima island. On the new land, 2 vents remain active, one of which was observed to produce mild strombolian explosions and spattering of liquid lava.

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Mi, 22. Jan 2014, 06:00
A photo and video posted by the Japan Coast Guard showed that on 20 January the Niijima portion of Nishino-shima was larger than the original island; the two islands had merged on 24 December 2013. White and brown plumes rose from Niijima and the water to the SW was discolored. ... Read all
Mi, 15. Jan 2014, 15:01
The new part of Nishino-Shima island with its eruptive vents and the still active lava flows towards the bay on the eastern shore
The Japanese Coast Guard made an overflight yesterday and published the attached picture of the (former new) island. It seems that while it is still might be effusing some lava that form flows reaching the eastern shore in the bay near the vents, the rate of lava effusion/growth has slowed down. No large changes of the island appear visible when compared to the images a week ago. ... Read all
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