Solid Earth Sciences (S)
Session Sub-category Complex & General(CG)
Session ID S-CG59
Title Oceanic plate as inputs to subduction zone: evolution process of the oceanic plate
Short Title Oceanic plate as subduction inputs
Main Convener Name Takanori Kagoshima
Affiliation University of Toyama
Co-Convener 1 Name Naoto Hirano
Affiliation Center for Northeast Asian Studies, Tohoku University
Co-Convener 2 Name Gou Fujie
Affiliation Japan Agency for Marine-Earth Science and Technology
Co-Convener 3 Name Yuya Akamatsu
Affiliation Japan Agency for Marine-Earth Science and Technology
Session Language 
J
Scope 
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.
Presentation Format Oral and Poster presentation
Invited Authors Manaka Kuroda (Graduate School of Environmental Studies, Nagoya University )
Ryosuke Oyanagi (Kokushikan University)
Asuka Yamaguchi (Atomosphere and Ocean Research Institute, The University of Tokyo)
Time Presentation No Title Presenter
Oral Presentation May 25 PM1
13:45 - 14:00 SCG59-01 Detailed seismic structure across the Kuril Trench off Nemuro, Hokkaido, Japan, revealed by FWI of dense OBS data Ryosuke Azuma
14:00 - 14:15 SCG59-02 Estimating three-dimensional resistivity structure in the Nankai Trough off Kumano, using marine magnetotelluric data Manaka Kuroda
14:15 - 14:30 SCG59-03 Topographic relief of the basement on the subducting oceanic plate along the entire Nankai Trough Kazuya Shiraishi
14:30 - 14:45 SCG59-04 Effect of fracture zones on bending of subducting oceanic lithosphere Nobukazu Seama
14:45 - 15:00 SCG59-05 Are earthquake nests beneath Kanto caused by subducted seamounts? Junichi Nakajima
15:00 - 15:15 SCG59-06 Stress drops of intraslab earthquakes at intermediate depth beneath Tohoku, northeastern Japan Saeko Kita
Oral Presentation May 25 PM2
15:30 - 15:45 SCG59-07 Hydrothermal alteration of subducting oceanic mantle: Implications from the Kanasaki serpentinites, Kanto Mountains Ryosuke Oyanagi
15:45 - 16:00 SCG59-08 Chemical and thermal state of oceanic lithosphere: reconstruction from petit-spot mantle xenoliths in the northwestern Pacific Norikatsu Akizawa
16:00 - 16:15 SCG59-09 Hydrothermal experiment simulating petit-spot hydrothermal systems Keishiro Azami
16:15 - 16:30 SCG59-10 Off-Tohoku Petit-spot drilling: IODP Expedition 502 Asuka Yamaguchi
16:30 - 16:45 SCG59-11 Origin of Lithium in Pore Fluids Near Offshore Fault Zone, Northern Noto Peninsula, Two Months After the 2024 Noto Peninsula Earthquake (M7.6) During the R/V Hakuho-maru cruise Zahra Zandvakili
16:45 - 17:00 SCG59-12 Evaluation of heat flow of Hi-net boreholes in the Kii Peninsula and estimation of heat flow distribution by integrating geophysical datasets Kazuya Ishitsuka
Presentation No Title Presenter
Poster Presentation May 25 PM3
SCG59-P01 Experimental constrain on water penetration velocity along outer-rise faults Yuichiro Naruse
SCG59-P02 Sedimentological and geochemical analysis of piston cores from the outer rise of the Japan Trench Yang ZHAO
SCG59-P03 New dense OBS seismic survey across Japan Trench to reveal detailed structural evolution of the incoming plate Gou Fujie
SCG59-P04 Physical properties of basalt and peperite at petit-spot volcanoes: preliminary results Yuya Akamatsu
SCG59-P05 Groundwater chemical anomaly related to the Noto Peninsula seismic swarm activity including the M7.6 earthquake in 2024 Takanori Kagoshima