JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Poster

S (Solid Earth Sciences) » S-VC Volcanology

[S-VC47] [JJ] Active volcanism

Mon. May 22, 2017 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall HALL7)

convener:Yuta Maeda(Nagoya University), Yosuke Aoki(Earthquake Research Institute, University of Tokyo)

[SVC47-P25] Distribution and occurrence of the pyroclastic flow deposit of the 2011 eruption of Shinmoedake, Kirishima volcano group, Southern Kyushu, Japan

*Masaaki Tsutsui1, Tetsuo Kobayashi2 (1.DIA Consultant Co., Ltd.,, 2.Kagoshima University)

Keywords:Kirishima volcano group, Shinmoedake, 2011 eruption, pyroclastic flow, sub-plinian

We investigated occurrence of the pyroclastic flow deposit of the 2011 Shinmoedake eruption about 5 years later. During a subplinian eruption, very small pyroclastic flows descended down on the south-western slope up to 800 m long, with 30 m wide. The volume of the deposit is estimated to be about 20,000 m3. No splintered stumps were found on the course of the flow, so it suggests that the speed of the flow was slow. The pyroclastic flow was estimated to be generated by a small-scale partial collapse of the subplinian eruption column.