[S-CG70] Ocean Floor Geoscience

Fri. May 29, 2026 10:45 AM - 12:15 PM Convention Hall (CH-B) (International Conference Hall, Makuhari Messe)

Chairperson:Nimura Kohei(Department of Earth and Planetary Sciences, Graduate School of Environmental Studies, Nagoya University)

Most of Earth's volcanism and much of its tectonic activity occur on and beneath the seafloor. Various seafloor phenomena are closely linked to plate tectonics, Earth's internal structure and dynamics, and are also connected to the Earth's environments through interactions with the hydrosphere and atmosphere. Rocks and sediments from the seafloor preserve records of Earth's evolution as well as its heat and material fluxes.
The Ocean Floor Geoscience session covers a broad range of research topics related to the seafloor, including mid-ocean ridge processes, subduction dynamics, arc and intraplate magmatism, crustal movement and structure, and more. All research fields and approaches are welcome. The session aims to encourage discussion among scientists from diverse disciplines and to integrate our understanding of the ocean floor.

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10:45 AM - 11:00 AM

[SCG70-11] Tectonics of a long oceanic transform and the temporal variability in melt supply, the Marie Celeste Transform Fault, Central Indian Ridge

*Kyoko Okino¹, Masakazu Fujii², Seitaro Ono³, Ryosuke Suzuki⁴, Tomohiro Ito⁵, Kenichiro Tani⁶, Shiki Machida⁷, Kohei Nimura⁸ (1. Atmosphere and Ocean Research Institute, The University of Tokyo, 2. National Institute of Polar Research, 3. Advanced Industrial Science and Technology, 4. Kobe University, 5. Hiroshima University, 6. National Museum of Nature and Science, 7. Chiba Instutute of Technology, 8. Nagoya University)

11:00 AM - 11:15 AM

[SCG70-12] Project MOWALL: seafloor topography and geochemistry of basalts along the Marie Celeste Transform in the Central Indian Ridge

*Shiki Machida¹, Kyoko Okino², Kana Ashida¹, Rentaro Takahashi³, Taiki Nakano⁴, Akihiro Tamura⁵, Akira Ishikawa³, Naoto Hirano⁴, Tomoaki Morishita⁵ (1. Chiba Institute of Technology, 2. Atmosphere and Ocean Research Institute, The University of Tokyo, 3. Institute of Science Tokyo, 4. Tohoku University, 5. Kanazawa University)

11:15 AM - 11:30 AM

[SCG70-13] Seismic velocity structure at 37ºE in the southwest Indian Ridge: Part 2

Hayato Onuki², *Toshinori Sato¹, Kimihiro Mochizuki³, Masanao Shinohara³ (1. Graduate School of Science, Chiba University, 2. Graduate School of Science and Engineering, Chiba University, 3. ERI, University of Tokyo)

11:30 AM - 11:45 AM

[SCG70-14] Tectonic setting of the abyssal basins around the Ontong Java Plateau

*Masao Nakanishi¹, Futa Honda², Syoka Shimizu², Daisuke Suetsugu³, Takashi Sano⁴ (1. Department of Earth Sciences, Graduate School of Science, Chiba University, 2. Earth and Environmental Sciences, Graduate School of Science and Engineering, Chiba University,, 3. Earthquake Research Institute, the University of Tokyo, 4. National Museum of Nature and Science)

11:45 AM - 12:00 PM

[SCG70-15] Linking Melt Heterogeneity, Crust–Mantle Structure, and Hydrogen Generation along the Ultraslow Gakkel Ridge

*Masakazu Fujii^1,2 (1. National Institute of Polar Research, 2. The Graduate University for Advanced Studies, SOKENDAI)

Discussion (12:00 PM - 12:15 PM)

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