[S-CG59] Oceanic plate as inputs to subduction zone: evolution process of the oceanic plate

Sun. May 25, 2025 1:45 PM - 3:15 PM 304 (International Conference Hall, Makuhari Messe)

convener:Takanori Kagoshima(University of Toyama), Naoto Hirano(Center for Northeast Asian Studies, Tohoku University), Gou Fujie(Japan Agency for Marine-Earth Science and Technology), Yuya Akamatsu(Japan Agency for Marine-Earth Science and Technology), Chairperson:Takanori Kagoshima(University of Toyama), Naoto Hirano(Center for Northeast Asian Studies, Tohoku University), Gou Fujie(Japan Agency for Marine-Earth Science and Technology), Yuya Akamatsu(Japan Agency for Marine-Earth Science and Technology)

Oceanic plate-subduction processes drive phenomena such as magma generation and fault formation, triggering volcanic and earthquake activity at subduction zones. Scales and distributions of such subduction zone-phenomena are controlled by physicochemical properties of subducting oceanic plates. In addition, oceanic plate-subduction processes transport surface materials such as water and carbon into the deep interior of Earth, playing an important role in global geochemical cycles. Physicochemical properties of oceanic plates as "subduction inputs" reflect their evolutionary histories from plate formation at mid-ocean ridges until subduction at trenches. We welcome contributions from a broad range of earth science (geophysics, geochemistry, geology, petrology, drilling science, and so on) discussing topics related to the nature of the subduction inputs and its spatial variations. This session is supported by the focus group of hard rock drilling science.

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1:45 PM - 2:00 PM

[SCG59-01] Detailed seismic structure across the Kuril Trench off Nemuro, Hokkaido, Japan, revealed by FWI of dense OBS data

*Ryosuke Azuma¹, Gou Fujie², Ryota Hino¹, Shuichi Kodaira² (1.Recearch Center for Prediction of Earthquake and Volcanic Eruption, Graduate School of Science, Tohoku University, 2.Japan Agency for Marine-Earth Science and Technology )

2:00 PM - 2:15 PM

[SCG59-02] Estimating three-dimensional resistivity structure in the Nankai Trough off Kumano, using marine magnetotelluric data

★Invited Papers

*Manaka Kuroda¹, Hiroshi Ichihara¹, Tada-nori Goto², Takafumi Kasaya³, Tetsuo Matsuno⁴, Keiichi Tadokoro¹, Hisanori Iwamoto⁵, Yusuke Ohta³, Yuya Akamatsu³, Kazuya Shiraishi³, Ryo Miura³ (1.Nagoya University , 2.University of Hyogo, 3.JAMSTEC, 4.Kobe University, 5.NME)

2:15 PM - 2:30 PM

[SCG59-03] Topographic relief of the basement on the subducting oceanic plate along the entire Nankai Trough

*Kazuya Shiraishi¹, Yasuyuki Nakamura¹, Ryuta Arai¹, Tetsuo No¹, Yuka Kaiho¹, Ryo Miura¹, Ayako Nakanishi¹, Seiichi Miura¹, Gou Fujie¹, Shuichi Kodaira¹ (1.Japan Agency for Marine-Earth Science and Technology)

2:30 PM - 2:45 PM

[SCG59-04] Effect of fracture zones on bending of subducting oceanic lithosphere

*Nobukazu Seama^1,2, Tomoeki Nakakuki³, Kazuya Kitada⁴, Gou Fujie⁴ (1.Department of Planetology, Graduate School of Science, Kobe University, 2.Kobe Ocean-Bottom Exploration Center (KOBEC), 3.Earth and Planetary System Science Program, Graduate School of Advanced Science and Engnineering, Hiroshima University, 4.Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

2:45 PM - 3:00 PM

[SCG59-05] Are earthquake nests beneath Kanto caused by subducted seamounts?

*Junichi Nakajima¹ (1.Department of Earth and Planetary Sciences, Institute of Science Tokyo)

3:00 PM - 3:15 PM

[SCG59-06] Stress drops of intraslab earthquakes at intermediate depth beneath Tohoku, northeastern Japan

*Saeko Kita¹, Takahiro Shiina², Heidi Houston³, Katsuhiko Shiomi⁴ (1.IISEE, Building Research Institute, Japan, 2.Geological Survey of Japan, National institute of Advanced Industrial Science and Technology, 3.University of Southern California, 4.National Research Institute for Earth Science and Disaster Resilience)

Session information