The Japan Meteorological Agency (JMA) has reported that an underwater eruption has occurred at the Fukutoku-Okanoba volcano. The eruption is still ongoing …
Satellite images of Himawari confirmed the presence of a steam-gas plume moving in a west-southwest direction.
As shown in the photo above, lightning, caused by the friction of pyroclasts erupting at high speed, gets into the eruptive plume of white steam.
The height of the plume is unknown and has not yet been reported, but, judging by the available images, it ranges from tens to hundreds of meters above sea level.
The Sentinel-5P / Tropomi satellite recorded a strong plume of sulfur dioxide 35 km from the volcano at an altitude of 3 km (18, 53 DU SO2).
Fukutoku-Okanoba is an underwater volcano 5 km northeast of the small pyramidal island of Minami-Iwo-jima in the Japanese volcanic island chain.
Its summit is just 14 meters (46 feet) below sea level. Its last major eruption occurred in early February 2010.
About 5 kilometers (3 miles) northeast of Minami-Iwo-jima Island and about 1000 kilometers (600 miles) south of Japan's main archipelago, Fukutoku-Okanoba, lies in an area where several short-lived volcanoes formed in the twentieth century.
Eruptions and underwater hydrothermal activity often cause water discoloration in the area, and during the eruptions the volcano has formed several temporary new islands.
The first observation of the new island was made in 1904-05, when Shin-Iwo-jima ("New sulfur island") was formed. Small new islands were also formed during the eruptions in 1914 and 1986.