Report on Nishinoshima (Japan) — 25 December-31 December 2013
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 25 December-31 December 2013
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2013. Report on Nishinoshima (Japan). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 25 December-31 December 2013. Smithsonian Institution and US Geological Survey.
27.247°N, 140.874°E; summit elev. 25 m
All times are local (unless otherwise noted)
According to a news article, since mid-December lava flows from the newly formed Niijima island expanded NE towards Nishino-shima, and on 24 December the two islands joined. The Niijima area was about 500 m long and 450 m wide.
Geologic Background. The small island of Nishinoshima was enlarged when several new islands coalesced during an eruption in 1973-74. Another eruption that began offshore in 2013 completely covered the previous exposed surface and enlarged the island again. Water discoloration has been observed on several occasions since. The island is the summit of a massive submarine volcano that has prominent satellitic peaks to the S, W, and NE. The summit of the southern cone rises to within 214 m of the sea surface 9 km SSE.
Source: The Japan News