The Japan Coast Guard reported that during an overflight of Nishinoshima on 24 November scientists observed white fumarolic plumes rising from multiple locations on the inner crater wall and the rim. The inner crater wall continued to be hot. The ocean water was brown around the W, S, and E parts of the island.

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: Japan Coast Guard