Report on Asosan (Japan) — 2 September-8 September 2015
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
2 September-8 September 2015
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2015. Report on Asosan (Japan). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 2 September-8 September 2015. Smithsonian Institution and US Geological Survey.
32.884°N, 131.104°E; summit elev. 1592 m
All times are local (unless otherwise noted)
JMA reported that on 3 September a small-scale eruption from Asosan’s Nakadake Crater generated a whitish plume that rose 200 m above the crater. During fieldwork later that day, scientists confirmed that the event originated in the SW part of the crater and minor ashfall had occurred. A white plume rose 400 m on 7 September. The Alert Level remained at 2 (on a scale of 1-5).
Geological Summary. The 24-km-wide Asosan caldera was formed during four major explosive eruptions from 300,000 to 90,000 years ago. These produced voluminous pyroclastic flows that covered much of Kyushu. The last of these, the Aso-4 eruption, produced more than 600 km3 of airfall tephra and pyroclastic-flow deposits. A group of 17 central cones was constructed in the middle of the caldera, one of which, Nakadake, is one of Japan's most active volcanoes. It was the location of Japan's first documented historical eruption in 553 CE. The Nakadake complex has remained active throughout the Holocene. Several other cones have been active during the Holocene, including the Kometsuka scoria cone as recently as about 210 CE. Historical eruptions have largely consisted of basaltic to basaltic-andesite ash emission with periodic strombolian and phreatomagmatic activity. The summit crater of Nakadake is accessible by toll road and cable car, and is one of Kyushu's most popular tourist destinations.