T13F:
Exploring the Characteristics and Dynamics of Oceanic Plates Entering Subduction Zones

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Session ID#: 31177

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, Yokohama, 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:  John Naliboff, University of California Davis, Davis, CA, United States and Shuichi Kodaira, JAMSTEC, Yokohama, Japan
OSPA Liaison:  Douglas Wiens, Washington University in St Louis, Department of Earth, Environmental, and Planetary Sciences, St. Louis, United States
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:

Heat flow evidence for hydrothermal circulation in the volcanic basement of subducting plates (212351)
Robert N Harris, Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States, Glenn A Spinelli, New Mexico Tech, Socorro, United States and Andrew T Fisher, University of California Santa Cruz, Earth and Planetary Sciences, Santa Cruz, CA, United States
Estimation of thermal conductivity change of basalt with subducting in Nankai Trough by laboratory measurements under separate high-pressure and high-temperature conditions (275278)
Weiren Lin1, Osamu Tadai2, Masataka Kinoshita3, Jun Kameda4, Wataru Tanikawa5, Takehiro Hirose5, Yohei Hamada6 and Osamu Matsubayashi7, (1)Kyoto University, Kyoto, Japan, (2)Marine Works Japan Ltd., Nankoku, Japan, (3)The University of Tokyo, Earthquake Research Institute, Tokyo, Japan, (4)Hokkaido University, Sapporo, Japan, (5)JAMSTEC, Kochi Institute for Core Sample Research, Nankoku, Japan, (6)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kochi Institute for Core Sample Research, Nankoku, Japan, (7)AIST - National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
Effect of bend faulting on the hydration state of oceanic crust: Electromagnetic constraints from the Middle America Trench (Invited) (245925)
Samer Naif, Scripps Institution of Oceanography, La Jolla, United States; Columbia University, Lamont-Doherty Earth Observatory, Palisades, United States, Kerry Key, BlueGreen Geophysics, LLC, San Diego, United States, Steven Constable, Scripps Institution of Oceanography, La Jolla, CA, United States and Rob L Evans, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Small-scale Forearc Structure from Residual Bathymetry and Vertical Gravity Gradients at the Cocos-North America Subduction Zone offshore Mexico (247863)
Emmanuel Soliman M Garcia and Yoshihiro Ito, Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan
3-D subduction dynamics in the western Pacific: Mantle pressure, plate kinematics, and dynamic topography. (262727)
Adam Holt1, Leigh Royden1, Thorsten W Becker2 and Claudio Faccenna3, (1)Massachusetts Institute of Technology, Cambridge, MA, United States, (2)University of Texas at Austin, Jackson School of Geosciences, Austin, TX, United States, (3)University Roma Tre, Science, Rome, Italy
Mantle Serpentinization near the Central Mariana Trench Constrained by Ocean Bottom Surface Wave Observations (254528)
Chen Cai1, Douglas A Wiens2, Daniel Lizarralde3, Melody O Eimer1 and Weisen Shen4, (1)Washington University in St Louis, St. Louis, MO, United States, (2)Washington University in St Louis, Department of Earth and Planetary Sciences, St. Louis, MO, United States, (3)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (4)Stony Brook University, Department of Geosciences, Stony Brook, United States
P-wave Velocity Structure Across the Mariana Trench and Implications for Hydration (253540)
Melody O Eimer, Washington University in St Louis, Department of Earth and Planetary Sciences, St. Louis, MO, United States, Douglas Wiens, Washington University in St. Louis, Earth, Environmental, and Planetary Sciences, St. Louis, United States, Daniel Lizarralde, WHOI, Woods Hole, MA, United States and Chen Cai, Earth and Planetary Sciences, Washington University in St Louis, St. Louis, MO, United States
Subduction erosion and implication for evolution model of the Yap trench: new evidence from the latest geophysical survey (246445)
Zhengyi Zhang1, Dongdong Dong2, Yongliang Bai2 and Guangxu Zhang2, (1)Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China, (2)Co-Author, Qingdao, China

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