[S-CG55] Ocean Floor Geoscience

Wed. May 28, 2025 9:00 AM - 10:30 AM Convention Hall (CH-A) (International Conference Hall, Makuhari Messe)

convener:Takeshi Iinuma(National Research and Development Agency Japan Agency for Marine-Earth Science and Technology), Masakazu Fujii(National Institute of Polar Research and SOKENDAI), Satoko Owari(Tokyo University of Marine Science and Technology), Yojiro Yamamoto(Japan Agency for Marine-Earth Science and Technology), Chairperson:Kenichiro Tani(Department of Geology and Paleontology, National Museum of Nature and Science), Seitaro Ono(The National Institute of Advanced Industrial Science and Technology)

Most of Earth's volcanism and much of its tectonic activity occur on and beneath the seafloor. Various phenomena on the seafloor are closely linked to plate tectonics, Earth's structure and dynamics, and also related to Earth's environments through the hydrosphere and atmosphere. Seafloor-derived rocks and sediments record Earth's evolution and heat/material fluxes on the Earth. Ocean Floor Geoscience session covers a broad range of research on seafloor such as mid-ocean ridge process, subduction dynamics, arc and intraplate magmatism, crustal movement and structre, etc. Every field of research and every approach are welcomed. The session aims to encourage discussion among scientists from different study fields and to integrate our understanding of the ocean floor.

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9:00 AM - 9:15 AM

[SCG55-12] Understanding the age and crustal structure of the unknown pieces of the Proto-Philippine Sea Plate: Preliminary results of the KH-23-10 cruise

*Kenichiro Tani¹, Kyoko OKINO³, Chih-Chieh SU⁸, Osamu ISHIZUKA², Hayato UEDA⁶, Yumiko HARIGANE², KanHsi HSIUNG⁴, Takuya SAGAWA⁵, Nao KUSUHASHI⁷, Akito OGAWA¹, Natsumi HOOKABE⁴, Sze Ling HO⁸, Jih-Hsin CHANG⁸, Hsin LEE⁹, Shye-Donq CHIOU⁸, Ta-Wei HSU⁸, * KH-23-10 shipboard scientific party (1.National Museum of Nature and Science, 2.National Institute of Advanced Industrial Science and Technology, 3.Atmosphere and Ocean Research Institute, The University of Tokyo, 4.Japan Agency for Marine-Earth Science and Technology, 5.Kanazawa University, 6.Niigata University, 7.Ehime University, 8.Institute of Oceanography, National Taiwan University, 9.National Museum of Marine Biology and Aquarium, Taiwan)

9:15 AM - 9:30 AM

[SCG55-13] Tectonic evolution of the Mariana Trough

*Seitaro Ono^1,2, Kyoko Okino¹, Nobukazu Seama³, Toshitsugu Yamazaki¹ (1.Atmosphere and Ocean Research Institute, The University of Tokyo, 2.The National Institute of Advanced Industrial Science and Technology, 3.Department of Planetology, Graduate School of Science, Kobe University)

9:30 AM - 9:45 AM

[SCG55-14] The reconstruction of the plate boundary between the Pacific-Izanagi plates during mid-Cretaceous time

*Masao Nakanishi¹, William W Sager² (1.Department of Earth Sciences, Graduate School of Science, Chiba University, 2.Earth and Atmospheric Sciences, University of Houston)

9:45 AM - 10:00 AM

[SCG55-15] An innovative approach to understanding tectonic evolution in the Eastern Nankai Trough, Central Japan.

*Philomene Vanessa EYANG ONDO EP ELLA NDONG¹, Asahiko TAIRA^1,2, Ayanori MISAWA³, Kohsaku ARAI³, Yuka YOKOYAMA¹, Izumi SAKAMOTO¹ (1.TOKAI Univ., 2.Japan Agency for Marine-Earth Science and Technology (JAMSTEC) , 3.Geological Survey of Japan (GSJ), AIST)

10:00 AM - 10:15 AM

[SCG55-16] Spatial heterogeneity of crustal extensional deformation in the Yaeyama Rift and Yonaguni Rift in the southern part of the Okinawa Trough

*Akane Yamamoto^1,2, Makoto Otsubo², Ayanori Misawa², Ryuta Arai³ (1.University of Tsukuba, 2.Geological Survey of Japan, AIST, 3.JAMSTEC)

10:15 AM - 10:30 AM

[SCG55-17] Distribution of submarine volcanoes in the Tokara Islands, Kagoshima Prefecture, Japan: Relation to stretching field due to rifting of the back-arc basin

*Keitatsu Kamochi¹, Seishiro Furuyama^1,2, Saki Ishino², Hiroaki Koge², Osamu Ishizuka² (1.Tokyo University of Marine Science and Technology, 2.Geological Survey of Japan, AIST)

Session information