Report on Kuchinoerabujima (Japan) — 22 October-28 October 2008
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 22 October-28 October 2008
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2008. Report on Kuchinoerabujima (Japan). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 22 October-28 October 2008. Smithsonian Institution and US Geological Survey.
30.443°N, 130.217°E; summit elev. 657 m
All times are local (unless otherwise noted)
On 27 October, JMA raised the Alert Level for Kuchinoerabu-jima from 2 to 3 (on a scale of 1-5). GPS measurements indicated that inflation just below the summit crater, which had started in September, was continuing. Fumarolic activity near summit had also increased. On 4 September, JMA had raised the Alert Level for from 1 to 2 because of the increased seismicity.
Geologic Background. A group of young stratovolcanoes forms the eastern end of the irregularly shaped island of Kuchinoerabujima in the northern Ryukyu Islands, 15 km W of Yakushima. The Furudake, Shindake, and Noikeyama cones were erupted from south to north, respectively, forming a composite cone with multiple craters. The youngest cone, centrally-located Shindake, formed after the NW side of Furudake was breached by an explosion. All historical eruptions have occurred from Shindake, although a lava flow from the S flank of Furudake that reached the coast has a very fresh morphology. Frequent explosive eruptions have taken place from Shindake since 1840; the largest of these was in December 1933. Several villages on the 4 x 12 km island are located within a few kilometers of the active crater and have suffered damage from eruptions.