[S-CG70] Ocean Floor Geoscience

Fri. May 29, 2026 3:30 PM - 5:00 PM Convention Hall (CH-B) (International Conference Hall, Makuhari Messe)

Chairperson:Watanabe Shun-ichi(Hydrographic and Oceanographic Department, Japan Coast Guard)

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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3:30 PM - 3:45 PM

[SCG70-22] Observation of Shallow Slow Slip Events in the Nankai Trough by seafloor and deep seafloor borehole fiber optic strainmeter arrays.

*Eiichiro Araki¹, Takashi Yokobiki¹, Shuhei Nishida¹, Mark Zumberge², Yuya Machida¹, Shuhei Tsuji¹, Hiroyuki Matsumoto¹, Yojiro Yamamoto¹ (1. Japan Agency for Marine-Earth Science and Technology, 2. Scripps Institusion of Oceanography, UCSD.)

3:45 PM - 4:00 PM

[SCG70-23] Acoustic Distance Meter survey revealed kinematic coupling at the shallowest plate interface in the southwestern Kuril Trench

*Shoutarou Matsumoto¹, Motoyuki Kido², Yusaku Ohta¹, Ryota Hino¹ (1. Graduate School of Science, Tohoku University, 2. International Research Institute of Disaster Science, Tohoku University)

4:00 PM - 4:15 PM

[SCG70-24] Understanding short-period changes in sound velocity field of sea water observed in GNSS-A surveys

*Reiki Ichinohe¹, Motoyuki Kido² (1. Graduate School of Science, Tohoku University, 2. International Research Institute of Disaster Science, Tohoku University)

4:15 PM - 4:30 PM

[SCG70-25] Effects of underwater sound speed variability on GNSS-A seafloor geodesy: A ROMS-based numerical study

*Tadashi Ishikawa¹, Yusuke Yokota², Shun-ichi Watanabe³, Yuto Nakamura³, Eiji Masunaga⁴, Yusuke Uchiyama⁵ (1. Japan Coast Guard Academy, 2. Institute of Industrial Science, the University of Tokyo, 3. Hydrographic and Oceanographic department, Japan Coast Guard, 4. Global and Local Environment Co-Creation Institute, Ibaraki University, 5. Graduate school of Engineering, Kobe University)

4:30 PM - 4:45 PM

[SCG70-26] Oceanographic interpretation of the error correlation term in the GNSS-A observation model of GARPOS

*Shun-ichi Watanabe¹, Tadashi Ishikawa², Yusuke Yokota³, Yuto Nakamura¹ (1. Hydrographic and Oceanographic Department, Japan Coast Guard, 2. Japan Coast Guard Academy, 3. IIS, Univ. Tokyo)

Discussion (4:45 PM - 5:00 PM)

Session information