Report on Nishinoshima (Japan) — 22 January-28 January 2020
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 22 January-28 January 2020
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2020. Report on Nishinoshima (Japan) (Sennert, S, ed.). Weekly Volcanic Activity Report, 22 January-28 January 2020. Smithsonian Institution and US Geological Survey.
27.247°N, 140.874°E; summit elev. 100 m
All times are local (unless otherwise noted)
Based on satellite images, the Tokyo VAAC reported that during 25-26 January ash plumes from Nishinoshima rose 1.5 km (5,000 ft) a.s.l. and drifted SW, W, and NW.
Geological Summary. The small island of Nishinoshima was enlarged when several new islands coalesced during an eruption in 1973-74. Multiple eruptions that began in 2013 completely covered the previous exposed surface and continued to enlarge the island. The island is the summit of a massive submarine volcano that has prominent 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.