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http://www.wired.com/2010/02/siusgs-weekly-volcano-report-23-92010-stymied-by-weather/
reports that the Tokyo VAAC reported explosions from Suwanose-jima during 5-6 and 9 February 2010
and also gives this nice geologic summary (below) that would be a good basis for a section of the article I guess.
I was a bit worried that there might be multiple islands with this name when I saw them mention the Ryukyu Islands - but this article states that Suwanosejima (諏訪之瀬島?), is one of the Tokara Islands which are in turn part of the Ryukyu Archipelago.
Geologic Summary. The 8-km-long, spindle-shaped island of Suwanose-jima in the northern Ryukyu Islands consists of an andesitic stratovolcano with two historically active summit craters. Only about 50 persons live on the sparsely populated island. The summit of the volcano is truncated by a large breached crater extending to the sea on the east flank that was formed by edifice collapse. Suwanose-jima, one of Japan’s most frequently active volcanoes, was in a state of intermittent Strombolian activity from On-take, the NE summit crater, that began in 1949 and lasted nearly a half century. The largest historical eruption took place in 1813-14, when thick scoria deposits blanketed residential areas, after which the island was uninhabited for about 70 years. The SW crater produced lava flows that reached the western coast in 1813, and lava flows reached the eastern coast of the island in 1884.