Solid Earth Sciences(S)
Session Sub-categorySeismology
Session IDS-SS04
TitleNankai Trough Seismogenic Zone Experiment toward the final challenge
Short TitleNanTroSEIZE toward the final challenge
Main ConvenerNameKyuichi Kanagawa
AffiliationGraduate School of Science, Chiba University
Co-Convener 1NameGregory F Moore
AffiliationUniversity of Hawaii at Manoa
Co-Convener 2NameMasataka Kinoshita
AffiliationEarthquake Research Institute, University of Tokyo
Co-Convener 3NameKeir Becker
AffiliationUniversity of Miami
Session LanguageEE
ScopeThe Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) is a multidisciplinary investigation of fault mechanics and seismogenesis along the megathrust at the Nankai Trough subduction zone, and includes reflection and refraction seismic imaging, direct sampling by drilling, in situ measurements, and long-term monitoring in conjunction with laboratory and numerical modeling studies. During the past 11 IODP expeditions off Kii Peninsula since 2007, 15 sites have been drilled by D/V "Chikyu" down to depths from 100s of meters to more than 3000 meters below seafloor, where the inner and outer wedge of the Nankai margin has been sampled extensively, and two state-of-the-art real-time downhole observatories are now in operation. NanTroSEIZE is now at the final stage with only two more expeditions planned for another downhole observatory installation at the toe site in early 2018, and for resuming riser drilling toward the megathrust at ~5200 meters below seafloor starting from late 2018. In this session jointly held with AOGS, we expect presentations on scientific outcomes from the NanTroSEIZE project and discussions toward the final challenge. We welcome presentations on, but are not limited to, seismic imaging, borehole logging and monitoring, chemical analyses of pore water and mud gas, lithology, structures, physical properties and laboratory experiments of cuttings and core samples, and theoretical and numerical modeling.
Presentation FormatOral and Poster presentation
Joint Session withAOGS
Invited Authors
  • Kazuya Shiraishi (ODS, JAMSTEC)
  • Asuka Yamaguchi (Atomosphere and Ocean Research Institute, The University of Tokyo)
  • Michael Underwood (New Mexico Institute of Mining and Technology, Department of Earth and Environmental Science, Socorro, NM USA)
  • Michael Strasser (University of Innsbruck)
  • James C Sample (School of Earth Sciences and Enviromental Sciences, N. Arizona Univ, Flagstaff, Arizona, USA)
  • Harold Tobin (Department of Geoscience, University of Wisconsin-Madison)
Time Presentation No Title Presenter Abstract
Oral Presentation May 22 AM1
09:00 - 09:15 SSS04-01Nankai Trough seismogenic zone structures revealed by improved 3D seismic imagesKazuya Shiraishi Abstract
09:15 - 09:30 SSS04-02Geometrical Dependence on the Stress and Slip Tendency Acting on the Subduction Megathrust of Nankai Seismogenic Zone Off KumanoMasataka Kinoshita Abstract
09:30 - 09:45 SSS04-03Natural fractures and stress state analysis from Nankai Trough wells’ logging dataNikita Dubinya Abstract
09:45 - 10:00 SSS04-04Stress condition during rupture propagation as new index for fault characterizationArito Sakaguchi Abstract
10:00 - 10:15 SSS04-05Limited changes of pore fluid pressure during seismic cycles around megasplay faults in subduction zonesMakoto Otsubo Abstract
10:15 - 10:30 SSS04-06Geological evidence of postseismic fluid discharge along an fossilized megasplay faultAsuka Yamaguchi Abstract
Oral Presentation May 22 AM2
10:45 - 11:00 SSS04-07The Nankai Trough Seismogenic Zone Experiment: Highlights from the World of Sedimentology and LithostratigraphyMichael Underwood Abstract
11:00 - 11:15 SSS04-08Multiscale landsliding in the Nankai Trough accretionary prismGregory F Moore Abstract
11:15 - 11:30 SSS04-09Submarine mass movements: From accretionary prism evolution and climate preconditiong to paleoseismologic implicationsMichael Strasser Abstract
11:30 - 11:45 SSS04-10Initial Results of IODP NanTroSEIZE Expedition 380: Borehole Observatory Installation at the Frontal Thrust of the Nankai PrismMasataka Kinoshita Abstract
11:45 - 12:00 SSS04-11Real-time monitoring of stress accumulations by the borehole strainmeters in the Nankai trough seismogenic zone, and initial strain data of the C0006 observatoryYuya Machida Abstract
12:00 - 12:15 SSS04-12Real-time monitoring of seismic and geodetic activities by long term borehole monitoring system in the Nankai Trough subduction zoneToshinori Kimura Abstract
Oral Presentation May 22 PM1
13:45 - 14:00 SSS04-13Recall the past to address future scientific challenges from legacy data to advance understanding of seisimogenic subduction zone: An IODP workshop Core-Log-Seismic investigation at SeaRina Fukuchi Abstract
14:00 - 14:15 SSS04-14Micro-tectonics of the tsunamigenic frontal thrust in the Nankai TroughGaku Kimura Abstract
14:15 - 14:30 SSS04-15Outline of the large structure drilled at Site C0002 based on the interpretation of logging while drilling (LWD) images and geophysical log response.Maria Jose Jurado Abstract
14:30 - 14:45 SSS04-16Deep processes in the Nankai accretionary prism from geochemical constraints, IODP Site C0002James C Sample Abstract
14:45 - 15:00 SSS04-17IODP Expedition 358: The Final(?) Megathrust Drilling Challenge for NanTroSEIZEHarold Tobin Abstract
15:00 - 15:15 SSS04-18Discussion toward the final challenge of the Nankai Trough Seismogenic Zone ExperimentKyuichi Kanagawa Abstract
Presentation No Title Presenter Abstract
Poster Presentation May 22 Core Time
SSS04-P01 Offshore receiver function imaging of the Philippine Sea Plate in the Nankai subduction zone Takashi Tonegawa Abstract
SSS04-P02 Geometry of protothrust zone along the Nankai Trough revealed by red relief image mapping and seismic reflection survey Mikiya Yamashita Abstract
SSS04-P03 Comparison of volcanic glasses from tephra deposits frontal prism and incoming sediments Rina Fukuchi Abstract
SSS04-P04 Compiling physical property data obtained through NanTroSEIZE project Suguru Yabe Abstract
SSS04-P05 Frictional properties of accretionary sediments/rocks and their implications for the transition of aseismic to seismic faulting at the Nankai Trough Subduction Zone Kyuichi Kanagawa Abstract
SSS04-P06 Frictional properties of incoming sediments/rocks at shallow conditions of the Japan Trench subduction zone Kyuichi Kanagawa Abstract
SSS04-P07 Relation of maturity of carbonaceous materials to friction coefficient Shunya Kaneki Abstract
SSS04-P08 Postseismic fluid discharge chemically recorded in altered pseudotachylyte discovered from an ancient megasplay fault Hasegawa Ryota Abstract
SSS04-P09 Chemical characteristics and source of the fluid involved in the black fault rocks in the Kodiak accretionary complex Tsuyoshi Ishikawa Abstract