Distribution of elastic properties and processes of change in physical properties along seismogenic subduction plate interface

2011 Fiscal Year Final Research Report

• Project/Area Number: 21340129
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: Kochi University
• Principal Investigator: HASHIMOTO Yoshitaka 高知大学, 教育研究部・自然科学系, 准教授 (40346698)
• Co-Investigator(Kenkyū-buntansha): SAKAGUCHI Arito 独立行政法人海洋研究開発機構, 地球内部変動研究センター, 技術研究主任 (80304666) ; TSUJI Takeshi 京都大学, 工学研究科, 助教 (60455491)
• Project Period (FY): 2009 – 2011
• Keywords: 内部変動 / 物性 / 沈み込みプレート境界地震発生帯

Research Abstract

In this study, we examined distribution of elastic properties of sediments and the processes of the change in physical properties in ancient seismogenic plate interface exposed on-land. The study area is the Cretaceous Shimanto Belt, Shikoku. Methods are making equipment for velocity measurements, fieldwork and sampling, and velocity measurements of the sediments. In the results, existence of high fluid pressure along seismogenic fault in Nankai plate interface, differences in lithification processes between lithologies, and fluid concentration in the seismogenic depth due to clay mineral dehydration are revealed.

Research Products

• [Journal Article] A large amount of fluid migration around shallow seismogenic depth preserved in tectonic melange (2012)
  • Author(s): Hashimoto, Y., Eida, M., Kirikawa, T., Iida, R., Takagi, M., Furuya, N., Nikaizo, A, Kikuchi, T. and Yoshimitsu, T.
  • Journal Title: the Cretaceous Shimanto Belt, Kochi, Southwest Japan, Island arc Volume: 1 Pages: 53-56
  • Peer Reviewed
• [Journal Article] In situ stress state from walkaround VSP anisotropy in the Kumano basin southeast of the Kii Peninsula (2011)
  • Author(s): Takeshi Tsuji, Ryota Hino, Yoshinori Sanada, Kiyohiko Yamamoto, Jin-Oh Park, Tetsuo No, Eiichiro Araki, Nathan Bangs, Roland von Huene, Gregory Moore, and Masataka Kinoshita
  • Journal Title: Japan, Geochem. Geophys. Geosyst Volume: 12
  • DOI: doi:10.1029/2011GC002583
  • Peer Reviewed
• [Journal Article] Potential tsunamigenic faults of the 2011 off the Pacific coast of Tohoku Earthquake (2011)
  • Author(s): Takeshi Tsuji, Yoshihiro Ito, Motoyuki Kido, Yukihito Osada, Hiromi Fujimoto, Juichiro Ashi, Masataka Kinoshita, and Toshifumi Matsuoka
  • Journal Title: Earth Plants and Space Volume: 63 Pages: 831-834
  • Peer Reviewed
• [Journal Article] Data report : Compressional and shear wave velocity measurements on sediments in the hanging wall and footwall of megasplay fault (2011)
  • Author(s): Hashimoto, Y., Tobin, H. J., Knuth, M., and Harada, A.
  • Journal Title: NantroSEIZE Stage 1, Proceedings of Integrated Ocean Drilling Program
  • DOI: doi:10.2204/iodp.proc.314315316.217.2011
  • Peer Reviewed
• [Journal Article] Vp/ Vs ratio and shear-wave splitting in the Nankai Trough seismogenic zone : Insights into effective stress, pore pressure and sediment consolidation (2011)
  • Author(s): Takeshi Tsuji, Jack Dvorkin, Gary Mavko, Norimitsu Nakata, Toshifumi, Matsuoka, Ayako Nakanishi, Shuichi Kodaira, and Osamu Nishizawa
  • Journal Title: Geophysics Volume: 76
  • DOI: doi:10.1190/1.3560018
  • Peer Reviewed
• [Journal Article] Seismic slip propagation to the up-dip end of plate boundary subduction interface faults : Vitrinite reflectance geothermometry on Integrated Ocean Drilling Program NanTroSEIZE cores (2011)
  • Author(s): Sakaguchi Arito et al
  • Journal Title: Geology Volume: 39 Pages: 395-399
  • Peer Reviewed
• [Journal Article] Velocity-porosity relationships for slope apron and accreted sediments in the Nankai Trough Seismogenic Zone Experiment(NantroSEIZE), Integrated Ocean Drilling Program(IODP) Expedition 315 Site C0001 (2010)
  • Author(s): Hashimoto. Y., Tobin, H. J., Knuth, M
  • Journal Title: Geochem. Geophys. Geosyst Volume: 11
  • DOI: doi:10.1029/2010GC003217
  • Peer Reviewed
• [Presentation] Differences in Vp and Vs at a seismogenic subduction interface : application to fluid pressure estimation by AVO analysis with Nankai seismic profile (2011)
  • Author(s): Yoshitaka Hashimoto, Noriaki Doi, Takeshi Tsuji
  • Organizer: AGU fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 20111205-09
• [Presentation] Change in deformation mechanisms from pressure solution to brittle faulting at shallow subduction interfaces : lithification or seismic cycle (2011)
  • Author(s): Yoshitaka Hashimoto, Natsuko Yamano, Mika Yamaguchi, Mio Eida
  • Organizer: Asia Oceania Geoscience Society Meeting
  • Place of Presentation: Taipei, Taiwan
  • Year and Date: 20110808-12
• [Presentation] P and S wave velocity measurements on sediments from the hanging-wall of megasplay fault, NantroSEIZE Stage 1 (2010)
  • Author(s): Hashimoto Y., Tobin, H. J. and Knuth, M. W.
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 20101213-17
• [Presentation] Seismic anisotropy from walk-around VSP data in the Kumano basin south of Kii Peninsula(IODP Site C0009A) (2010)
  • Author(s): T. Tsuji, R. Hino, Y. Sanada et al
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 20101213-17
• [Presentation] Frictional high heat at shallow portion of the mega-splay fault and frontal thrust : Core analysis of IODP NanTroSEIZE stage 1 (2010)
  • Author(s): Arito Sakaguchi, Frederick Chester, Daniel Curewitz et al
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 20101213-17
• [Presentation] Evidence for high frictional heat at a shallow portion of the faults, Tonankai earthquake rupture area (2010)
  • Author(s): Arito Sakaguchi, Frederick Chester, Daniel Curewitz et al
  • Organizer: Western Pacific Geophysical Meeting(WPGM)
  • Place of Presentation: Taipei, Taiwan
  • Year and Date: 20100622-24
• [Presentation] P and S-wave velocity measurements and textures of sediments for hanging wall of the Megasplay fault : NantroSEIZE Stage 1 (2010)
  • Author(s): Hashimoto, Y., Kunth, M W, Tobin, H, Harada, A
  • Organizer: Western Pacific Geophysical Meeting(WPGM)
  • Place of Presentation: Taipei, Taiwan
  • Year and Date: 20100622-24
• [Presentation] Vp/ Vs and shear-wave splitting at the seismogenic plate subduction zone : Insight into effective-stress and pore pressure distribution (2010)
  • Author(s): T. Tsuji, N. Nakata, T. Matsuoka, J. Dvorkin, A. Nakanishi, S. Kodaira
  • Organizer: SEG annual meeting
  • Place of Presentation: Denver
  • Year and Date: 2010-10-20
• [Presentation] Paleo-thermal condition of the shallow mega-splay fault based on vitrinite reflectance : Core analysis of IODP NanTroSEIZE stage 1 (2009)
  • Author(s): Arito Sakaguchi
  • Organizer: AGU fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2009-12-15
• [Presentation] Stress inversion analysis for micro-faults in an on-land accretionary complex, the Yokonami melange, Shikoku, SW Japan : an implication in seismic cycle (2009)
  • Author(s): Hashimoto, Y.
  • Organizer: AGU fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2009-12-15
• [Book] in" Earthquake Research and Analysis/ Book 1 (2012)
  • Author(s): Hashimoto, Y. and Kaji, U., Intech
  • Total Pages: 13
  • Publisher: the Cretaceous Shimanto Belt, SW Japan