Report on Kikai (Japan) — 30 September-6 October 2020
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
30 September-6 October 2020
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2020. Report on Kikai (Japan). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 30 September-6 October 2020. Smithsonian Institution and US Geological Survey.
30.793°N, 130.305°E; summit elev. 704 m
All times are local (unless otherwise noted)
JMA reported that at 0757 on 6 October an eruption at Satsuma Iwo-jima, a subaerial part of Kikai’s NW caldera rim, generated a volcanic plume that rose 200 m above the Iodake crater rim. The Alert Level remained at 2 (on a 5-level scale).
Geological Summary. Kikai is a mostly submerged, 19-km-wide caldera near the northern end of the Ryukyu Islands south of Kyushu. It was the source of one of the world's largest Holocene eruptions about 6,300 years ago when rhyolitic pyroclastic flows traveled across the sea for a total distance of 100 km to southern Kyushu, and ashfall reached the northern Japanese island of Hokkaido. The eruption devastated southern and central Kyushu, which remained uninhabited for several centuries. Post-caldera eruptions formed Iodake lava dome and Inamuradake scoria cone, as well as submarine lava domes. Historical eruptions have occurred at or near Satsuma-Iojima (also known as Tokara-Iojima), a small 3 x 6 km island forming part of the NW caldera rim. Showa-Iojima lava dome (also known as Iojima-Shinto), a small island 2 km E of Tokara-Iojima, was formed during submarine eruptions in 1934 and 1935. Mild-to-moderate explosive eruptions have occurred during the past few decades from Iodake, a rhyolitic lava dome at the eastern end of Tokara-Iojima.