Niijima, a submarine volcano in the south of the Ogasawara Islands in Tokyo, which generated a large amount of pumice stones. It was shaved by the waves and the surrounding area was dyed in emerald color = 0:33 pm on the 25th (from Kyodo News)

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Niijima, a submarine volcano in the south of the Ogasawara Islands in Tokyo, which generated a large amount of pumice stones. It was shaved by the waves and the surrounding area was dyed in emerald color = 0:33 pm on the 25th (from Kyodo News)

Niijima, a submarine volcano, Fukutoku-Okanoba, scraped by waves = 0:39 pm on the 25th, Tokyo, Ogasawara Islands (from Kyodo News)

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Niijima, a submarine volcano, Fukutoku-Okanoba, scraped by waves = 0:39 pm on the 25th, Tokyo, Ogasawara Islands (from Kyodo News)

Niijima (bottom) of Fukutoku-Okanoba, a submarine volcano that is shaved by waves. In the back is South Iwo Jima = 0:36 pm on the 25th, Tokyo / Ogasawara Islands (from Kyodo News)

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Niijima (bottom) of Fukutoku-Okanoba, a submarine volcano that is shaved by waves. In the back is South Iwo Jima = 0:36 pm on the 25th, Tokyo / Ogasawara Islands (from Kyodo News)

On the 25th, a reporter interviewed Fukutoku-Okanoba, a submarine volcano to the south of the Ogasawara Islands, and a large amount of pumice stones were released. I confirmed that. Teruki Oikawa, a senior researcher at the National Institute of Advanced Industrial Science and Technology (volcanic geology), said that the remaining Niijima would sink in about a month, saying that “a large amount of pumice stones will not be newly generated for the time being.”

The area around Niijima floating in the blue sea was dyed in emerald color. It seems to be the effect of volcanic gas emitted from the seabed. Volcanic ash and earth and sand gray that flowed from the edge of the island that was shaved by the waves are also mixed. A small amount of pumice stones were also seen floating in a row nearby.