Ogasawara Islands Nishinoshima Active fumarolic activity and discoloration of the surrounding seawater continue.

On Nishinoshima Island in the Ogasawara Islands, active fumaromaric activity and discoloration of the surrounding seawater continued, as confirmed by images taken from the air taken from NHK. The expert who accompanied me pointed out that "depending on the conditions of underground magma, a large amount of lava may be released again, and it is necessary to continue observations in the medium to long term."

Nishinoshima in the Ogasawara Islands, about 1000,2013 kilometers south of the city center, resumed its eruption in 40 for the first time in about 2019 years, and especially from 1 to the following year, the Earthquake Research Institute of the University of Tokyo estimates that at least 2019 million cubic meters of volcanic ash and lava were ejected.

Since it is difficult to install surveillance cameras and it is not possible to observe volcanic activity at all times, the Japan Coast Guard continues to observe volcanic activity on a regular basis.

Late last month, NHK filmed Nishinoshima from the sky with Associate Professor Fukashi Maeno of the University of Tokyo, who specializes in volcanology.

On the coast, seawater near the coast mixed with released volcanic gases turned orange and flowed for at least several kilometers in a northwesterly direction.

Fumaroles were still active, and in addition to the crater in the center of the island, they were seen rising from several places, including the slopes of mountains and the ground at the foothills.

Associate Professor Maeno points out that this is due to the continued active release of volcanic gases, and that "magma that rose due to eruptive activity in 2020-1 may still be stagnant in shallow underground areas."

In addition, according to Associate Professor Maeno, in January last year, it was confirmed that the southern side of the island, where the layer of volcanic ash was thin, was also deposited thickly this time, indicating that active eruptive activity is likely to continue.

The situation in which seawater turns dark and fumarolic activity continues for a long time has not been confirmed since the 1973 eruption, when observations by the Japan Coast Guard began, and Associate Professor Maeno said, "Changes in volcanic activity after a large-scale eruption also lead to an understanding of the movement of magma underground. I'm talking.