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Report on Nishinoshima (Japan) — 12 August-18 August 2020


Nishinoshima

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 12 August-18 August 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, 12 August-18 August 2020. Smithsonian Institution and US Geological Survey.

Weekly Report (12 August-18 August 2020)

Nishinoshima

Japan

27.247°N, 140.874°E; summit elev. 100 m

All times are local (unless otherwise noted)


Based on satellite data, the Tokyo VAAC reported that during 12-18 August ash plumes from Nishinoshima rose to 2.4-5.5 km (8,000-18,000 ft) a.s.l. and drifted NE, NW, W, and SW.

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.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)