[M-IS27] Interactions of Geosphere-Hydrosphere-Biosphere and Deep-sea Methane Environments

Wed. May 27, 2026 1:45 PM - 3:15 PM 301B (International Conference Hall, Makuhari Messe)

Chairperson:Tomaru Hitoshi(Department of Earth Sciences, Chiba University), Abe Noriaki(National Institute of Advanced Industrial Science and Technology)

Methane produced in subseafloor environments is transported to the seafloor and discharged into seawater at cold seeps, mud volcanoes, and hydrothermal vents. The discharged methane and accompanying fluids form unique environments, such as methane hydrates and carbonates, and sustain chemosynthetic ecosystems at the seafloor and in the shallow subseafloor. Methane and the methane-driven phenomena are closely related to the ocean and global environmental changes, material cycles, and evolution of life, making them a key for better understanding of the interactions among Geosphere-Hydrosphere-Biospheres. Deepening and expanding our knowledge of these processes will also contribute to the sustainable development of human society, including resource utilization, disaster prevention, and biodiversity and ecosystem conservation. This session welcomes latest research topics related to the geophysical background, resources, geobiology, and geochemical origin of methane and accompanying fluids at marine and terrestrial cold seeps, mud volcanoes, and hydrothermal vents from the past to present.
This session aims to promote intergenerational exchange and to expand and strengthen domestic communities through lively discussion. Oral presentations in this session are given in Japanese or English. English notation for all figures and tables is required for all of slides and posters.

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Introduction (1:45 PM - 1:50 PM)

1:50 PM - 2:15 PM

[MIS27-01] Research project on shallow methane hydrate: Toward elucidating methane generation and dynamics in marine environments

★Invited Papers

*Hideyoshi Yoshioka¹, Yusuke Miyajima¹, Mikio Satoh¹, Miho Asada¹, Toshiyuki Yokota¹ (1. Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology)

2:15 PM - 2:30 PM

[MIS27-02] Missing MHs; implied by bathymetry change at the shallow methane hydrate (MH) bearing areas at off-Joetsu, eastern margin of Sea of Japan

*Miho Asada¹, Yoshimi Yamaguchi¹, Mikio Satoh¹ (1. AIST)

2:30 PM - 2:45 PM

[MIS27-03] Estimation of upward fluid migration rate within bacterial mat at active cold seep sites on the Joetsu Knoll in the Joetsu Basin

*Shusaku Goto¹ (1. Institute for Geo-Resources and Environment National Institute of Advanced Industrial Science and Technology)

2:45 PM - 3:00 PM

[MIS27-04] Alterations to the seafloor environment from a drilling test in a methane-hydrate bearing area on Joetsu Knoll in the Sea of Japan

Timothy Philip Kinzler¹, Ryo Mukai², Hiroki Kise³, *Kyoko Yamaoka³, Iguchi Akira³, Atsushi Suzuki³, Yuki Ota³, Ayumi Tsukasaki³, Masahiro Suzumura³, Travis William Washburn^1,3 (1. Texas A&M University - Corpus Christi, 2. Marine Biological Research Institute of Japan Co., Ltd., 3. National Institute of Advanced Industrial Science and Technology)

3:00 PM - 3:15 PM

[MIS27-05] Fluid pathways and indicators of biogenic gas system in the Offshore Kii Strait based on 3D Seismic survey

*Ryu Tomida¹, Shodai Uchida¹, Yuki Kawano¹, Norihito Yamane¹ (1. Japan Organization for Metals and Energy Security )