Report on Nishinoshima (Japan) — 5 April-11 April 2023
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 5 April-11 April 2023
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2023. Report on Nishinoshima (Japan) (Sennert, S, ed.). Weekly Volcanic Activity Report, 5 April-11 April 2023. Smithsonian Institution and US Geological Survey.
27.247°N, 140.874°E; summit elev. 100 m
All times are local (unless otherwise noted)
JMA reported that at 1050 and 1420 on 11 April ash plumes from Nishinoshima rose 1.9 km above the crater rim and drifted NW and W.
Geological Summary. 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 ocean surface 9 km SSE.