The 132nd Annual Meeting of the Geological Society of Japan
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Session Details

Session OralT14 ［Topic Session］Volcano-tectonics of KyushuEDI

[3oral101-10]T14. Volcano-tectonics of Kyushu

Tue. Sep 16, 2025 8:45 AM - 12:00 PM JST
Tue. Sep 16, 2025 11:45 PM - 3:00 AM UTC
oral room 1(E105)
Chiar:Tomohiro TSUJI(Yamaguchi University), Kiyokazu OOHASHI(National Institute of Advanced Industrial Science and Technology), Makoto OTSUBO(Geological Survey of Japan), Kohta KARASHIMA(Yamaguchi Univ.)
8:45 AM - 9:15 AM JST(11:45 PM - 12:15 AM UTC)

[T14-O-1][Invited] Seismotectonics, volcanism and subduction dynamics in Kyushu: New insights from seismic tomography

*Dapeng ZHAO1 (1. Tohoku Univ.)
9:15 AM - 9:30 AM JST(12:15 AM - 12:30 AM UTC)

[T14-O-2]Spatial variations in igneous intrusion structures in the Yaeyama Rift: Insights from seismic reflection imaging

*Ryuta Arai1, Ayanori Misawa2, Makoto Otsubo2, Masataka Kinoshita3, Saki Ishino2, Akane Yamamoto4,2 (1. JAMSTEC, 2. GSJ, AIST, 3. ERI, Univ. Tokyo, 4. Univ. Tsukuba)
9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)ECS

[T14-O-3]Temporal variations in component characteristics of ash-fall deposits of the 2025 Shinmoedake eruption, Kirishima Volcano, Japan

*Tatsuya Konoo1, Isoji Miyagi1, Akihiko Tomiya1, Kurumi Iwahashi1, Teruki Oikawa1, Keiko Matsumoto1, Ryuta Furukawa1, Yuki Kusano1, Seiko Yamasaki1, Ryunosuke Kazahaya1, Hiroshi Shinohara1, Yuya Ikenaga1, Naoki Araya1, Yoshihiro Ishizuka1 (1. Geological Survery of Japan, AIST)
9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)

[T14-O-4]Central Kyushu as a Transtension Tectonic Zone

*Kiyokazu Oohashi1 (1. National Institute of Advanced Industrial Science and Technology)
10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)entry

[T14-O-5]Evolution of the Active Zone of the Oita-Kumamoto Tectonic Line Inferred from the Geology of the Southwestern Wall of the Aso Caldera

*Kohta KARASHIMA1, Tomohiro TSUJI1 (1. Yamaguchi Univ.)
10:15 AM - 10:30 AM JST(1:15 AM - 1:30 AM UTC)

[3oral101-10-6add]Break

10:30 AM - 11:00 AM JST(1:30 AM - 2:00 AM UTC)

[T14-O-6][Invited] Evolution of magmatic activity and associated tectonic setting in the Aso region, central Kyushu, Japan

*Masaya Miyoshi1, Hirochika Sumino2, Ryoko Senda3, Takashi Sano4, Taro Shinmura5, Kuniyuki Furukawa6, Masataka Kawaguchi7, Toshiaki Hasenaka8 (1. Faculty of Science, Fukuoka University, 2. Research Center for Advanced Science and Technology, The University of Tokyo, 3. Faculty of Social and Cultural Studies, Kyushu University, 4. Department of Science, National Museum of Nature and Science, 5. Faculty of Economics, Kumamoto Gakuen University, 6. Faculty of Business Administration, Aichi University, 7. Earthquake Research Institute, The University of Tokyo, 8. Center for Water Cycle, Marine Environment and Disaster Management, Kumamoto University)
11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)

[T14-O-7]Infiltration Clays in Fault Damage Zone at Depths below 300 m in a Borehole Penetrating through the Futagawa Fault

*Susumu SHIBUTANI1, Weiren LIN2, Nana KAMIYA2 (1. Chi-ken Sogo Consultants Co., Ltd., 2. Graduate School of Engineering, Kyoto University)
11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)entry

[T14-O-8]Fault movement of the Futagawa Fault Zone inferred from geological structure and distribution of Aso-4 pyroclastic flow deposits

*Reina KAIHARA1, Tomohiro TSUJI1, Kiyokazu OOHASHI2, Susumu SHIBUTANI3 (1. Yamaguchi University, 2. AIST, 3. Chi-ken Sogo Consultants Co.,Ltd)
11:30 AM - 11:45 AM JST(2:30 AM - 2:45 AM UTC)

[T14-O-9]Timing of volcanism in the Himeshima volcano group constrained by the tephrostratigraphy of the Pleistocene Karato Formation

*Tomonori Naya1, Kiyohide Mizuno1, Yu Horiuchi2 (1. AIST, GSJ, 2. Oita Himeshima Geopark Promotion Office)
11:45 AM - 12:00 PM JST(2:45 AM - 3:00 AM UTC)

[T14-O-10]Influence of slab stress heterogeneity subsiding into the Ryukyu Arc on dehydration pathways and volcanic activity

*Makoto OTSUBO1, Ayumu Miyakawa1 (1. Geological Survey of Japan)
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