Floating pumice blocks from remote eruption in August ports near Tokyo, Japan

Thu, 25 Nov 2021, 16:52
16:52 PM | BY: T
Pumice raft in a Japanese port in late Oct 2021 (image: @yasukonotes / twitter)
Pumice raft in a Japanese port in late Oct 2021 (image: @yasukonotes / twitter)
The mixed submarine-subaerial eruption of the volcano in last August, when a new island formed, still shows effects today: large amounts of floating pumice stones washed up on the shores of Greater Tokyo recently.
On other coasts in southwest Japan, pumice rafts from the volcano have been a burden for a month and often impaired fishing and seafaring.
Pumice forms as highly viscous magma erupts with myriads of small gas bubbles trapped within the sticky liquid, which freezes to volcanic glass. It could be described as frozen lava foam. Due to its bubbly structure, it is often lighter than water and thus floats. With time, water enters the cavities by diffusion and through tiny cracks in the glassy walls around the bubbles, but it can take months and even years until the pumice eventually will sink and form a deposit on the sea floor, if it isn't washed up on shores earlier.

Previous news

Fri, 27 Aug 2021, 23:06
Brown pumice continue to swirl to the W direction from Fukutoku-Okanoba volcano (image: JCG)
The Haneda Air Base (HAB) did a new flight observation at the volcano on 26 August. ... Read all
Tue, 17 Aug 2021, 05:59
Pumice swirling trail in the Pacific Ocean from the space (image: @planet/twitter)
A spectacular satellite image of the Planet satellite company from 15 August depicts pumice swirling trail in the Pacific Ocean. Pumice is currently meandering on the sea as the volcano started to produce Surtseyan eruption on 13 August and led to the birth of the new island. Pyroclastic material is flowing about 60 km to the northwest of the volcano. Read all
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