Report on Kuchinoerabujima (Japan) — 1 April-7 April 2015
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 1 April-7 April 2015
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2015. Report on Kuchinoerabujima (Japan). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 1 April-7 April 2015. Smithsonian Institution and US Geological Survey.
30.443°N, 130.217°E; summit elev. 657 m
All times are local (unless otherwise noted)
JMA reported that no eruptions occurred from Kuchinoerabujima during 30 March-3 April, although the level of activity remained elevated. White plumes rose 1 km above Shindake Crater, and incandescence from the crater was observed at night. Volcanic earthquakes were detected; tremor was absent. Fumarolic activity in a crack in W part of the crater was observed during a field survey on 30 March. In addition the temperature of a thermal anomaly in the W part continued to rise. The Alert Level remained at 3 (on a scale of 1-5).
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.