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 Nishimo-shima volcano (西之島, literally: Western Island, also: Rosario Island) is the tiny submerged part of a caldera in the northern Volcano Islands of Japan. The small 700 m wide island was significantly enlarged during the last eruption in 1974, which joined several new islands that formed then.
Water discoloration due to possible minor eruptions and / or shallow submarine hydrothermal activity in the area is a frequent sight.
The mostly submerged volcano is a massive seamount with prominent flank cones on the south, west and NE flanks. The southern cone rises to a depth of 214 m below the sea surface, 9 km SSE of Nishino-shima.
caldera, submarine volcano approx 70 m / 215 ft (currently growing) Volcano Islands, Japan, 27.27°N / 140.88°E Current status: dormant (1 out of 5) Nishino-shima webcams / live data | ReportsNishino-shima volcano booksNishino-shima volcano eruptions:2017, 2013-15, 1985(?), 1982(?), 1980(?), 1978(?), 1975(?), 1973-74 Typical eruption style:explosive Last earthquakes nearby
Latest satellite images  Nishino-shima volcano news & activity updates:Nishino-Shima volcano (Izu Islands, Japan): new lava flows enlarge islandMonday Dec 16, 2013 22:11 PM | BY: T 
The new island at Nishino-Shima with the first cone (21-25 Nov, yellow), and the two lava deltas that formed in late Nov-10 Dec (right) and the second delta (l) that formed during 10-13 Dec  Images of the new island (Japan Coast Guard) Activity continues at the new island and has apparently picked up in strength again. Lava flows have created a significant new delta of new land during the past 3 days, enlarging the island to a current width measuring approx. 400 (E-W) by 300 (N-S) meters.
The Japanese Coast Guard posted an interesting video and report that also shows that sporadic strombolian explosions from the active vent continue along with lava effusion:
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Links / Sources: Previous news
Thursday, Dec 12, 2013 Activity has decreased significantly over the past days. A video from 10 December shows no more strombolian explosions, only degassing and no significant changes to the size of the island compared to a week ago. It is possible that there is still weak effusion of lava, but it appears that the eruption could have come to an end. ... [more] Monday, Dec 09, 2013
The new island continues to grow slowly, increasing its surface by lava flows in all directions. Its diameter is now approx 300 meters. ... [more]Tuesday, Dec 03, 2013 The new island continues to erupt and grow, increasing its chances of long-time survival by the day. The active vent on the islet continues to be in strombolian eruption and has by now built a new cone that is higher than the main island itself (which is 38 m). ... [more]
Thursday, Nov 28, 2013 The youngest island of the world continues to grow as the eruption continues. Recent footage shows (from 24 Nov) shows strombolian activity and a lava flow on the southeast flank of the small new cone. ... [more] Saturday, Nov 23, 2013
The eruption in Japan's remote Izu island chain that created a new island the day before yesterday continues. It has already built a small cone with its crater isolated from sea-water access. ... [more]More on VolcanoDiscovery: Mayon volcano photos: Mayon on Luzon Island, towering above Legazpi city is famous for being one of the most perfectly symmetrical stratovolcanoes in the world. It is also one of the most active and most dangerous volcanoes (not only) in the Philippines.  Volcano & eruption special tours: Tours dedicated to usually a single volcano currently in eruption. These trip, sometimes offered only last-minute through our newsletter, are among the most adventurous and most popular in our program.  Divergent plate boundaries in oceans: Two ocean plates move apart from each other. Hot upwelling mantle material forms magmas that continuously produce new oceanic crust. An ocean widens.  Tours to erupting volcanoes: From time to time, we organize special tours to see volcanoes in eruption. These are often announced only few days or weeks in advance. Find out more!
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