T14B:
Exploring the Characteristics and Dynamics of Oceanic Plates Entering Subduction Zones

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Session ID#: 31183

Session Description:
Oceanic plates entering subduction zones play a key role in transporting material from Earth’s surface to the deep interior. In the last decade, several marine geophysical studies have revealed new high-resolution observations of bending-induced normal faults and additional structural variations suggesting infiltration of water into the crust and mantle of the downgoing plate. This session aims to highlight these findings as well as examine the relationship between large outer-rise earthquakes, megathrust events, compositional variations in the incoming plate and forearc, and the tectonic forces acting on the downgoing plate and the plate boundary interface. We also welcome presentations based on geophysical and geological studies of incoming oceanic plates, analyses of rock samples, effects of plate bending on the earth’s volatile cycle and igneous activities in the incoming plate, and numerical modeling studies that aim to elucidate the key tectonic processes within the incoming plate.
Primary Convener:  Shuichi Kodaira, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan
Conveners:  Douglas Wiens, Washington University in St Louis, Earth and Planetary Sciences, St. Louis, MO, United States, Asuka Yamaguchi, University of Tokyo, Atmosphere and Ocean Research Institute, Kashiwa, Japan and John Naliboff, University of California Davis, Davis, CA, United States
Chairs:  Douglas Wiens, Washington University in St Louis, Department of Earth, Environmental, and Planetary Sciences, St. Louis, United States and Asuka Yamaguchi, Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan
OSPA Liaison:  Shuichi Kodaira, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan
Index Terms:

7220 Oceanic crust [SEISMOLOGY]
7240 Subduction zones [SEISMOLOGY]
8120 Dynamics of lithosphere and mantle: general [TECTONOPHYSICS]
8170 Subduction zone processes [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Magnetic anomalies over subduction zones (239878)
Hanjin Choe, IPGP, CNRS UMR 7154, Paris, France and Jerome Dyment, Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005 Paris, France, Paris, France
Comparative Roughness Characteristics of the Subducting Seafloor and Statistical Relationships with Seismogenic Potential, with Special Emphasis on Great Earthquakes (243995)
Michel Peyret, Géosciences Montpellier, Montpellier Cedex 05, France, Serge Lallemand, Géosciences Montpellier, Montpellier University, CNRS, Montpellier, France, Elenora van Rijsingen, Ecole Normale Supérieure, PSL Research University, CNRS UMR 8538, Laboratoire de Géologie, Paris, France and Diane Arcay, UMR5243 Geosciences Montpellier, CNRS, Montpellier, France
Subduction of the Louisville Ridge Seamount Chain (250413)
Adam Hackett Robinson, Matthew James Funnell and Christine Peirce, University of Durham, Durham, United Kingdom
How broad and deep is the region of chemical alteration of oceanic plates at trenches? (Invited) (275637)
Cesar R Ranero, ICM-CSIC, Barcelona Center for Subsurface Imaging, ICREA at CSIC, Instituto de Ciencias del Mar, Barcelona, Spain, Barcelona, Spain, Ingo Grevemeyer, GEOMAR, Kiel, Germany and Udo Barckhausen, BGR Federal Institute for Geosciences and Natural Resources, Hanover, Germany
Variation in the nature of incoming oceanic plate along Japan Trench (277425)
Gou Fujie1, Koichiro Obana2, Yuka Kaiho1, Tomoaki Yamada3, Shuichi Kodaira4, Takehi Isse3 and Seiichi Miura5, (1)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan, (2)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Research Institute for Marine Geodynamics, Kanagawa, Japan, (3)Earthquake Research Institute, The University of Tokyo, Tokyo, Japan, (4)JAMSTEC, Yokohama, Japan, (5)Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan
Heterogeneous distribution of pelagic sediments incoming the Japan Trench possibly controlling slip propagation on shallow plate boundary fault (216795)
Asuka Yamaguchi, Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan, Yasuyuki Nakamura, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan, Rina Fukuchi, Research and Development (R&D) Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan, Hiroaki Kurano, Atmosphere and Ocean Research Institute, the University of Tokyo, Kashiwa, Japan, Ken Ikehara, AIST - National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan, Toshiya Kanamatsu, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan, Kazuno Arai, Center for Advance Marine Core Research, Kochi University, Nankoku, Japan, Kazuko Usami, Geological Survey of Japan, AIST, Tsukuba, Japan and Juichiro Ashi, Atmosphere and Ocean Research Institute University of Tokyo, Tokyo, Japan
Lateral variation of seismic structure of the uppermost Pacific Plate in the Northwest Pacific Ocean (248060)
Takashi Tonegawa, JAMSTEC, Research Institute for Marine Geodynamics, Yokohama, Japan, Koichiro Obana, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Research Institute for Marine Geodynamics, Kanagawa, Japan, Gou Fujie, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan and Shuichi Kodaira, JAMSTEC, Yokohama, Japan
High-resolution imaging of the low velocity layer in Alaskan subduction zone with scattered waves and interferometry (295385)
Katie M Keranen1, Doyeon Kim2, Geoffrey A Abers3, Younghee Kim4, Jiyao Li5, Donna J Shillington6 and Larry D Brown1, (1)Cornell University, Earth and Atmospheric Sciences, Ithaca, NY, United States, (2)Imperial College London, Earth Science and Engineering, London, SW7, United Kingdom, (3)Cornell University, Ithaca, NY, United States, (4)Seoul National University, School of Earth and Environmental Sciences, Seoul, Korea, Republic of (South), (5)Columbia University of New York, Palisades, NY, United States, (6)Columbia University, Lamont-Doherty Earth Observatory, Palisades, NY, United States

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