3-D structure and physical properties of subduction-zone earthquake faults

2013 Fiscal Year Final Research Report

• Project Area: New perspective of great subduction-zone earthquakes from the super deep drilling
• Project/Area Number: 21107002
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: The University of Tokyo
• Principal Investigator: PARK JIN-OH 東京大学, 大気海洋研究所, 准教授 (70359199)
• Co-Investigator(Kenkyū-buntansha): MORITA Sumito 独立行政法人産業技術総合研究所, 地圏資源環境研究部門, 主任研究員 (20358188) ; YAMADA Yasuhiro 京都大学, 工学系研究科研究院, 准教授 (20362444) ; SAITO Saneatsu 独立行政法人海洋研究開発機構, 海洋掘削科学研究開発センター, グループリーダー (40292859) ; HASHIMOTO Yoshitaka 高知大学, 自然科学系, 准教授 (40346698) ; NAKAMURA Yasuyuki 独立行政法人海洋研究開発機構, 地震津波海域観測研究開発センター, グループリーダー代理 (60345056)
• Co-Investigator(Renkei-kenkyūsha): SANADA Yoshinori 独立行政法人海洋研究開発機構, 地球深部探査センター, 技術研究主任 (70362449)
• Project Period (FY): 2009-07-23 – 2014-03-31
• Keywords: ３次元反射法地震探査 / 南海トラフ地震発生帯掘削 / 巨大分岐断層 / 構造解釈 / 岩石物性

Research Abstract

To figure out detailed image and physical properties of the subduction thrust fault system generating large earthquakes and tsunamis, we conducted 2-D/3-D seismic reflection data analysis and also acquired IODP (Integrated Ocean Drilling Program) drill data (core sample and downhole logging) in the Nankai Trough and Japan Trench margins. We revealed 3-D detailed structure, P-wave velocity structure, fault activity, and fluid supplier of the Nankai megasplay fault. High pore fluid pressures of the Nankai shallow megathrust fault play an important role in coseismic slip propagation all the way or nearly all the way to the trench. Moreover, high-resolution seismic reflection and LWD (logging while drilling) data allowed us to define the shallow megathrust fault that generated large tsunamis during the 2011 Tohoku earthquake (M9.0).

Research Products

• [Journal Article] Characteristics of a tsunamigenic megasplay fault in the Nankai Trough (2013)
  • Author(s): Yamada, Y., Masui, R., Tsuji, T
  • Journal Title: Geophysical Research Letters Volume: 40 Pages: 4594-4598
  • DOI: 10.1002/grl.50888
  • Peer Reviewed
• [Journal Article] Aftershocks near the updip end of the 2011 Tohoku-Oki earthquake (2013)
  • Author(s): Obana K., Kodaira, S., Shinohara, M., Hino, R., Uehira, K., H. Shiobara, H., Nakahigashi, K., Yamada, T., Sugioka, H., Ito, A., Nakamura, Y., Miura, S., No, T., Takahashi, N
  • Journal Title: Earth and Planetary Science Letters Volume: 382 Pages: 111-116
  • DOI: 10.1016/j.epsl.2013.09.007
  • Peer Reviewed
• [Journal Article] Depositional architecture, provenance, and tectonic / eustatic modulation of Miocene submarine fans in the Shikoku Basin : Results from Nankai Trough Seismogenic Zone Experiment (2013)
  • Author(s): Pickering, K.T., Underwood, M., Saito, S., Naruse, H., Kutterolf, S., Scudder, R., Park, J.-O., Moore, G.F., Slagle, A.L
  • Journal Title: Geochemistry, Geophysics, Geosystems Volume: 14 Pages: 1722-1739
  • DOI: 10.1002/ggge.20107
  • Peer Reviewed
• [Journal Article] Difference in acoustic properties at seismogenic fault along a subduction interface: Application to estimation of effective pressure and fluid pressure ratio (2013)
  • Author(s): Hashimoto, Y., Doi, N., Tsuji, T
  • Journal Title: Tectonophysics Volume: 600 Pages: 134-141
  • DOI: 10.1016/j.tecto.2013.03.016
  • Peer Reviewed
• [Journal Article] Widely distributed thrust and strike-slip faults within subducting oceanic crust in the Nankai Trough off the Kii Peninsula, Japan (2013)
  • Author(s): Tsuji, T., Kodaria, S., Ashi, J., Park, J.-O
  • Journal Title: Tectonophysics Volume: 600 Pages: 52-62
  • DOI: 10.1016/j.tecto.2013.03.0142
  • Peer Reviewed
• [Journal Article] High-resolution seismic imaging in the Japan Trench axis area off Miyagi, northeastern Japan (2013)
  • Author(s): Nakamura, Y., Kodaira, S., Miura, S., Regalla, C., Takahashi, N
  • Journal Title: Geophysical Research Letters Volume: 40 Pages: 1713-1718
  • DOI: 10.1002/grl.50364
  • Peer Reviewed
• [Journal Article] Expedition 343 Scientists., Stress State in the Largest Displacement Area of the 2011 Tohoku-Oki Earthquake (2013)
  • Author(s): Lin, W., Conin, M., Moore, J.C., Chester, F.M., Nakamura, Y., Mori, J.J., Anderson, L., Brodsky, E.E., Eguchi, H
  • Journal Title: Science Volume: 339 Pages: 687-690
  • DOI: 10.1126/science.1229379
  • Peer Reviewed
• [Journal Article] A large amount of fluid migration around shallow seismogenic depth preserved in tectonic melange, the Cretaceous Shimanto Belt, Kochi, Southwest Japan (2012)
  • Author(s): Hashimoto, Y., Eida, M., Kirikawa,T., Iida, R., Takagi, M., Furuya, N., Nikaizo, A, Kikuchi, T., Yoshimitsu, T
  • Journal Title: Island arc Volume: 21 Pages: 53-56
  • DOI: 10.1111/j.1440-1738.2011.00806.x
  • Peer Reviewed
• [Journal Article] Coseismic fault rupture at the trench axis during the 2011 Tohoku-oki earthquake (2012)
  • Author(s): Kodaira, S., No, T., Nakamura, Y., Fujiwara, T., Kaiho, Y., Miura, S., Takahashi, N., Kaneda, Y., Taira, A
  • Journal Title: Nature Geoscience Volume: 5
  • DOI: 10.1038/ngeo1547
  • Peer Reviewed
• [Journal Article] Possible ground instability factor implied by slumping and dewatering structures in high-methane-flux continental slope, Submarine Mass Movements and Their Consequences (2012)
  • Author(s): Morita, S., Nakajima, T., Hanamura, Y
  • Journal Title: Advances in Natural and Technological Hazard Research Volume: 31 Pages: 311-320
  • DOI: 10.1007/978-94-007-2162-3_28
  • Peer Reviewed
• [Journal Article] Seismic reflection and bathymetric evidences for the Nankai earthquake rupture across a stable segment-boundary (2012)
  • Author(s): Park, J.-O., Kodaira, S
  • Journal Title: Earth Planets Space Volume: 64 Pages: 299-303
  • DOI: 10.5047/eps.2011.10.006
  • Peer Reviewed
• [Journal Article] Slope failures in analogue model experiments of accretionary wedges, Submarine Mass Movements and Their Consequences (2012)
  • Author(s): Yamada, Y., Oshima, Y., Matsuoka, T
  • Journal Title: Advances in Natural and Technological Hazards Research Series Volume: 1 Pages: 343-354
  • Peer Reviewed
• [Journal Article] Principal horizontal stress orientations prior to the 2011 Mw 9.0 Tohoku-Oki, Japan, earthquake in its source area (2011)
  • Author(s): Lin, W., Saito, S., Sanada, Y., Yamamoto, Y., Hashimoto, Y., Kanamatsu, T
  • Journal Title: Geophysical Research Letters Volume: 38 Pages: L00G10
  • DOI: 10.1029/2011GL049097
  • Peer Reviewed
• [Journal Article] In situ stress state from walkaround VSP anisotropy in the Kumano basin southeast of the Kii Peninsula, Japan, Geochemistry (2011)
  • Author(s): Tsuji, T., Hino, R., Sanada, Y., Yamamoto, K., Park, J.-O., No, T., Araki, E., Bangs, N., von Huene, R., Moore, G.F., Kinoshita, M
  • Journal Title: Geophysics, Geosystems Volume: 12 Pages: Q0AD19
  • DOI: 10.1029/2011GC003583
  • Peer Reviewed
• [Journal Article] Massive methane release triggered by seafloor erosion offshore southwestern Japan (2010)
  • Author(s): Bangs N.L., Hornbach, M.J., Moore, G.F., Park, J.-O
  • Journal Title: Geology Volume: 38 Pages: 1019-1022
  • DOI: 10.1130/G31491.1
  • 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: Geochemistry, Geophysics, Geosystems Volume: 11 Pages: Q0AD05
  • DOI: 10.1029/2010GC003217
  • Peer Reviewed
• [Journal Article] A low-velocity zone with weak reflectivity along the Nankai subduction zone (2010)
  • Author(s): Park, J.-O., Fujie, G., Wijerathne, L., Hori, T., Kodaira, S., Fukao, Y., Moore, G.F., Bangs, N.L., Kuramoto, S., Taira, A
  • Journal Title: Geology Volume: 38 Pages: 283-286
  • DOI: 10.1130/G30205.1
  • Peer Reviewed
• [Journal Article] Submarine landslides at subduction margins: insight from physical models (2010)
  • Author(s): Yamada, Y., Yamashita, Y., Yamamoto, Y
  • Journal Title: Tectonophysics Volume: 484 Pages: 156-167
  • DOI: 10.1016/j.tecto.2009.09.007
  • Peer Reviewed
• [Journal Article] Seismotectonic implications of the Kyushu-Palau ridge subducting beneath the westernmost Nankai forearc (2009)
  • Author(s): Park, J.-O., Hori, T., Kaneda, Y
  • Journal Title: Earth Planets Space Volume: 61 Pages: 1013-1018
  • URL: http://www.terrapub.co.jp/journals/EPS/pdf/2009/6108/61081013.pdf
  • Peer Reviewed
• [Journal Article] Origin and evolution of a splay fault in the Nankai accretionary wedge (2009)
  • Author(s): Strasser, M., Moore. G.F., Kimura, G., Kitamura, Y., Kopf. A., Lallemant, S., Park, J.-O., Screaton J.E., Su, X., Underwood, B.M., Zhao, X
  • Journal Title: Nature Geoscience Volume: 2 Pages: 648-652
  • DOI: 10.1038/NGE0609
  • Peer Reviewed
• [Presentation] Shear veins under high pore pressure condition along subduction interface: Yokonami Melange, Cretaceous Shimanto Belt, Shikoku, Southwest Japan (2013)
  • Author(s): Hashimoto, Y., Eida, M
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2013-12-13
• [Presentation] Expedition 343 scientists, Results from a new seismic survey around the JFAST drill site (2013)
  • Author(s): Nakamura, Y., Kodaira, S., Yamamoto, Y., Fujie, G., Obana, K., Miura, S., Takahashi, N., Cook, B., Conin, M., Chester, F., Mori, J., Eguchi, N., Toczko, S
  • Organizer: AGU Fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2013-12-11
• [Presentation] Research activities on submarine landslides in gentle continental slope (2013)
  • Author(s): Morita, S., Goto, S., Miyata, Y., Nakamura, Y., Kitahara, Y., Yamada, Y
  • Organizer: Eos Trans, AGU Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2013-12-09
• [Presentation] IODP Expedition 344 Scientists, Preliminary results on horizontal stress orientation and stress magnitude, off Osa Peninsura, Costa Rica (2013)
  • Author(s): Saito, S., Malinverno, A., Lin, W., Yamamoto, Y., Wu, H,Y., Harris, R., Sakaguchi, A., Ujiie, K., Vannucci, P., Petronotis, K
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2013-12-09
• [Presentation] The Nankai tsunamigenic decollement moisturized by Miocene fan turbidites (2013)
  • Author(s): Park, J.-O., Naruse, H
  • Organizer: The 2nd Japan-Korea Marine Geosciences Symposium on Global Open Ocean Studies
  • Place of Presentation: 東京大学大気海洋研究所, 千葉
  • Year and Date: 2013-11-13
• [Presentation] Stress fluctuations around faults identified in borehole breakouts and their implications to hydrocarbon exploration/production (2013)
  • Author(s): Yamada, Y., Shibanuma, J., Matsuoka, T
  • Organizer: The 6th International Symposium on In-situ Rock Stress (RS2013)
  • Place of Presentation: Sendai, Japan
  • Year and Date: 2013-08-20
• [Presentation] Seismic inversion for incoming sedimentary sequence in the Nankai Trough margin off Kumano Basin, southwest Japan (2012)
  • Author(s): Park, J.-O., Naito, K
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2012-12-04
• [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): Hashimoto, Y., Doi, N., Tsuji, T
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2011-12-05
• [Presentation] Slope failures in accretionary wedges in physical experiments (2011)
  • Author(s): Yamada, Y., Oshima, Y., Matsuoka, T
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2011-12-05
• [Presentation] Seismic Reflection Images of the 1946 Nankai Megasplay Fault off Kii Peninsula, southwest Japan (2010)
  • Author(s): Park, J.-O
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2010-12-14
• [Presentation] P and S wave velocity measurements on sediments from the hanging-wall of megasplay fault (2010)
  • Author(s): Hashimoto, Y., Tobin, H. J., Knuth, M. W
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2010-12-13
• [Presentation] Periodic development of slope failures due to thrust displacement in physical models: application to submarine landslides (2010)
  • Author(s): Yamada, Y., Yamashita, Y., Yamamoto, Y
  • Organizer: EGU General Assembly 2010
  • Place of Presentation: Vienna, Austria
  • Year and Date: 2010-05-02
• [Presentation] Petrophysical characterization of subduction input sediments off Kii Peninsula: Results from IODP NanTroSEIZE Stage 2 (2009)
  • Author(s): Saito, S., Underwood, M., Kubo, Y., Sanada, Y., Araki, E., Byrne, T.B., McNeill, L.C., Saffer, D.M., Eguchi, N.O., Toczko, Sean, Moe, K
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2009-12-15
• [Book] 最新・高知の地質-大地が動く物語 (2012)
  • Author(s): 橋本善孝
  • Total Pages: 22
  • Publisher: (株)南の風社
• [Book] Submarine Mass Movements and Their Consequences (2012)
  • Author(s): Yamada, Y., Kawamura, K., Ikehara, K., Ogawa, Y., Urgeles, R., Mosher, D., Chaytor, J., Strasser, M. (Eds.)
  • Total Pages: 756
  • Publisher: Springer
• [Remarks]
  • URL: http://www-solid.eps.s.u-tokyo.ac.jp/nantro~/