The Japan Meteorological Agency (JMA) reported that a submarine eruption occurred at Fukutoku-Okanoba volcano at 06:20 local time on August 13, 2021. The eruption is still ongoing…
Satellite images from Himawari confirmed a steam and gas plume drifting in a west-southwest direction.
As shown in the image below, the eruptive plume of white vapor is being hit by lightning bolts caused by the friction of the pyroclasts expelled at high speed.
The plume rose more than 16km in the sky. Many international flights between Japan and the Philippines were canceled due to possible ashfall on August 15, 2021.
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 of SO2).
Fukutoku-Okanoba is a submarine volcano 5 km NE of the small pyramidal island Minami-iwo-jima in the Japanese Volcano Island chain.
Its summit is just 14 meters (46 feet) below sea level. Its last major eruption was in early February 2010.
Roughly 5 kilometers (3 miles) northeast of the island of Minami-Iwo-jima and about 1,000 kilometers (600 miles) south of the main Japanese archipelago, Fukutoku-Okanoba occurs in an area where several short-lived volcanoes formed in the twentieth century.
Eruptions and submarine hydrothermal activity often cause water discoloration in the area, and during eruptions, the volcano has built several temporary new islands.
The first observation of a new island was in 1904-05 when it formed Shin-Iwo-jima (“New Sulfur Island”). Small new islands were also formed during the eruptions in 1914 and 1986. [Earth of Fire, Volcano discovery]
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