Solid Earth Sciences(S)
Session Sub-categoryComplex & General
Session IDS-CG58
TitleInvestigation of inputs to subduction zones: Influence of tectonic processes on the incoming plate
Short TitleInputs to subduction zones
Main ConvenerNameMakoto Yamano
AffiliationEarthquake Research Institute, the University of Tokyo
Co-Convener 1NameTomoaki Morishita
AffiliationSchool of Natural System, Colleage of Science and Technology, Kanazawa University
Co-Convener 2NameGou Fujie
AffiliationJapan Agency for Marine-Earth Science and Technology
Session LanguageEJ
ScopeVarious tectonic processes occur on the seaward side of the trench associated with bending of the incoming oceanic plate, e.g., fracturing of oceanic crust, infiltration of water, and intraplate volcanism. Investigation of these processes and their influence on the incoming plate provides important information on the boundary condition at the trench, inputs to subduction zones. We welcome contributions from a broad range of earth science (geophysics, geology, petrology, and so on) discussing topics related to inputs to subduction zones such as occurrence of tectonic processes due to bending of the incoming plate, modification of the incoming plate by the processes, relationship between the processes and the inherited structure of the incoming plate, and influence of the processes on the subduction plate interface. We hope discussions are made on studies of a variety of subduction zones, including the Japan Trench and the Nankai Trough, and comparative studies among different subduction zones.
Presentation FormatOral and Poster presentation
Invited Authors
  • Shiki Machida (Ocean Resources Research Center for Next Generation (ORCeNG), Chiba Institute of Technology)
  • Yasuyuki Nakamura (Japan Agency for Marine Earth Science and Technology)
  • Kohei Hatakeyama (Department of Earth and Planetary Systems Science, Hiroshima University)
  • Jun-Ichi Kimura (Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Scienc and Technology)
Time Presentation No Title Presenter Abstract
Oral Presentation May 23 AM1
09:00 - 09:15 SCG58-01Fluid circulation through petit-spot volcanic knolls inferred from surface heat flow distributionMakoto Yamano Abstract
09:15 - 09:30 SCG58-02Heat and fluid transport among the petit-spot volcanoes seaward of the Japan Trench outer rise area: Flux estimation and numerical modelingYoshifumi Kawada Abstract
09:30 - 09:45 SCG58-03Modification of the subducting plate by petit-spot volcanism: Impregnation of CO2-rich melt from the asthenosphereShiki Machida Abstract
09:45 - 10:00 SCG58-04Magmatism at the Outer Rise and Impact of Subduction: SCORE/APL proposals for outer rise drillingAsuka Yamaguchi Abstract
10:00 - 10:15 SCG58-05Along-axis variation of the inputs to the Japan Trench subduction zone revealed from seismic imagingYasuyuki Nakamura Abstract
10:15 - 10:30 SCG58-06Variation of oceanic sediment entering the Japan Trench and its implication for a co-seismic slip reaching the trench axisShuichi Kodaira Abstract
Oral Presentation May 23 AM2
10:45 - 11:00 SCG58-07Distribution of Intra-plate seismicity in trench-outer rise region along the Japan Trench based on ocean bottom seismograph observationsKoichiro Obana Abstract
11:00 - 11:15 SCG58-08Elastic wave velocity measurement of serpentinite toward quantitative evaluation of serpentinizaiton at outer-rise regionKohei Hatakeyama Abstract
11:15 - 11:30 SCG58-09Effect of a half-graben structure on formation of a shallow plate boundary fault in subduction zone with analog modellingHiroaki Koge Abstract
11:30 - 11:45 SCG58-10Possible fluid effects on megathrust fault in the coseismic rupture zone of the 2011 Tohoku-oki earthquakeJih-Hsin Chang Abstract
11:45 - 12:00 SCG58-11Subduction zone input-output: Modeling of geochemical mass balance using the Arc Basalt Simulator version 5Jun-Ichi Kimura Abstract
12:00 - 12:15 SCG58-12Effects of hydrous lithospheric mantle on deep water circulation and subduction zone dynamicsAtsushi Nakao Abstract
Presentation No Title Presenter Abstract
Poster Presentation May 23 Core Time
SCG58-P01 Progress and perspective of drilling plans that elucidate modification of oceanic plate just prior to subduction Tomoaki Morishita Abstract
SCG58-P02 Crustal structure in the outer-rise off the Japan Trench Ryosuke Azuma Abstract
SCG58-P03 Bend faulting and a large seamount in the central Japan Trench Gou Fujie Abstract
SCG58-P04 Resistivity structure of incoming Pacific Plate around the Outer-Rise Region, off Japan Trench Shinya Sato Abstract
SCG58-P05 Regional distribution of the incoming sediments along the Nankai Trough and its implications for the megathrust fault behavior Jin-Oh Park Abstract
SCG58-P06 IODP Expedition 375: Hikurangi Subduction Margin – first chronostratigraphic constraints derived from shipboard palaeomagnetic analyses Annika Greve Abstract