Nishino-Shima volcano (Izu Islands, Japan): ash plumes from explosive activity
Sun, 26 Jan 2014, 11:5211:52 AM | BY: T
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
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.
The 2 active vents of Niishima (the left one showing spattering of liquid lava) and an active flow
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.
Links / Sources:
Links / Sources:
Wed, 15 Jan 2014, 15:01
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
Mon, 6 Jan 2014, 13:37
The new island that had "touched" Nishino-Shima has continued to grow and the two islands form now a coherent single one, with a interesting "butterfly" shape. This might of course change quickly again as well. There are now no traces left of the beach and the little colored lake that existed a week ago when the two islands started to merge. ... Read all