NASAのインスタグラム(nasa) - 4月5日 00時19分

A new Pacific island grows 600 miles south of Tokyo! In November 2013, a seafloor volcano in the western Pacific Ocean spewed enough material to rise above the water line. The new island, or Niijima, sprouted just 500 meters from Nishino-shima, another volcanic island that had last erupted and expanded in 1973-74. Four months later, the new and the old are now one island, and the volcanic eruption shows no sign of abating.

On March 30, 2014, the Operational Land Imager on the Landsat 8 satellite captured this image of Nishino-shima. The Niijima portion of the island is now larger than the original Nishino-shima, and the merged island is slightly more than 1,000 meters across. Two cones have formed around the main vents and stand more than 60 meters above sea level, triple the highest point of the island in December. Volcanic lava flows are reported to be most active now on the south end of the island. A plume of volcanic gas, steam, and ash rises from the island. Tiny particles in the plume are seeding the formation of fluffy cumulus clouds. The intermittent, pulsing shape of the cloud stream might be a reflection of the volcanic eruption itself.
Image Credit: NASA

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