, Volume 67, Issue 3, pp 203-204
Date: 12 Feb 2005

Special issue: The 2000 eruption of Miyakejima volcano, Japan

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Two major eruptions occurred in the Japan island arc in 2000. Usu volcano, Hokkaido, erupted at the end of March (Yamaoka 2002) and Miyakejima Island near Tokyo at the end of June. Both volcanoes had exhibited eruptive activity regularly every 20–30 years for 300 years. However, the 2000 eruption at Miyakejima was very different from others experienced by its people over the last 300 years. It was scientifically significant in several respects. First, lateral migration of magma under the sea occurred up to ∼30 km from the volcanic center, resulting in the formation of a summit caldera. Second, large quantities of sulfur dioxide (>100 kg/s) were continuously emitted for more than 4 years. Third, the magma migration and caldera formation were continuously monitored in detail using a range of modern techniques. This issue contains six papers on geophysical, geochemical and geological aspects of the 2000 eruption at Miyakejima.

Submarine eruption offshore of the volcanic island occurred on