At Fukutoku-Okanoba, a submarine volcano in the Ogasawara Islands, where the eruption was confirmed for the first time in 11 years last month, one of the two newly created islands could hardly be confirmed, according to an analysis by the Geospatial Information Authority of Japan. ..
No eruptions have been confirmed since mid-last month, and the Japan Meteorological Agency says the island is unlikely to survive due to waves.
Fukutoku-Okanoba, a submarine volcano south of Iwo Jima in the Ogasawara Islands, was confirmed to erupt on the 13th of last month for the first time in 11 years. It was confirmed that Volcanic activity continues, including eruptions, but no large-scale eruptions have been confirmed since the 16th of last month.
As a result of analyzing the satellite image taken by the Geographical Survey Institute on the 5th of this month, it was found that the island on the east side can hardly be confirmed. It seems that it was scraped by the waves. Although the land area of the western island is slightly smaller, it can be clearly seen in the image.
In addition, some of the pumice stones from the eruption collected by the Japan Meteorological Agency's observation ship around the sea area were released to the press on the 7th. Pumice stones are white or gray and have innumerable bubbles of different sizes on the surface. Larger ones are about 40 cm in diameter, which is about twice as large as a bowling sphere, but weigh only about 5 kg.
As a result of analysis by the National Institute of Advanced Industrial Science and Technology, it was also confirmed that the components such as silicon dioxide contained in pumice stones are very similar to the ejecta of the 1986 eruption 35 years ago. For this reason, it is analyzed that it is due to a series of volcanic activities with the same magma as at that time.
In Fukutoku-Okanoba, an island was formed by a large amount of ejecta associated with the eruption, and after that, the activity of disappearing by waves was repeated. In the eruption 35 years ago, the island disappeared after about two months due to wave erosion.
The Japan Meteorological Agency considers that the island is unlikely to survive in the future, and will continue observations and surveys with related organizations.
In addition, the Japan Meteorological Agency will continue the eruption warning announced in the surrounding sea area, and a mixture of volcanic gas and volcanic ash called "base surge" including large volcanic blocks that scatter in a trajectory on ships and aircraft navigating in the vicinity will be high speed. We are calling for caution against the phenomenon that spreads in.