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2008 Fiscal Year Final Research Report

Study on mantle upwelling based on seismic velocity and anisotropy structures in subduction zones

Research Project

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Project/Area Number 18740268
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Solid earth and planetary physics
Research InstitutionTohoku University

Principal Investigator

NAKAJIMA Junichi  Tohoku University, 大学院理学研究科, 助教授 (30361067)

Project Period (FY) 2006 – 2008
Keywords地震波速度構造 / トモグラフィ / 上昇流 / 異方性構造
Research Abstract

地震波速度トモグラフィ法により、日本列島下の地震波速度構造を推定した。その結果、太平洋プレートの沈み込みによって生じた上昇流であると解釈される低速度領域が上部マントルにイメージングされた。一方、上昇流の流れの方向を反映している異方性構造を推定した結果、異方性の向きは太平洋プレートの沈み込み方向にほぼ平行であることが明らかになった。これらの結果は、海洋性プレートの沈み込みによってマントル対流が生じていることを示す重要な地震学的観測事実である。

  • Research Products

    (27 results)

All 2008 2007 2006

All Journal Article (13 results) (of which Peer Reviewed: 13 results) Presentation (14 results)

  • [Journal Article] Tomographic evidence for hydrated oceanic crust of the Pacific slab beneath northeastern Japan: Implications for water transportation in subduction zones2008

    • Author(s)
      Tsuji, Y., J. Nakajima, and A. Hasegawa
    • Journal Title

      Geophys. Res. Lett. 35, L14308, doi:10.1029/2008GL034461

    • Peer Reviewed
  • [Journal Article] Existence of low-velocity zones under the source areas of the 2004 Niigata-Chuetsu and 2007 Niigata-Chuetsu-Oki earthquakes inferred from travel-time tomography2008

    • Author(s)
      Nakajima, J., and A. Hasegawa
    • Journal Title

      Earth, Planets and Space 60

      Pages: 1127-1130

    • Peer Reviewed
  • [Journal Article] Seismological imaging of the mantle wedge structure beneath the northeastern Japan arc and its interpretation (in Japanese with English abstract)2008

    • Author(s)
      Nakajima, J., and A. Hasegawa
    • Journal Title

      J. Geography 117

      Pages: 76-92

    • Peer Reviewed
  • [Journal Article] Transportation of H2O in the NE Japan subduction zone as inferred from seismic observations - Supply of H2O from the slab to the arc crust (in Japanese with English abstract)2008

    • Author(s)
      Hasegawa, A., J. Nakajima, S. Kita, Y. Tsuji, K. Nii, T. Okada, T. Matsuzawa, and D. Zhao
    • Journal Title

      J. Geography 117

      Pages: 59-75

    • Peer Reviewed
  • [Journal Article] Anomalous deepening of a belt of intraslab earthquakes in the Pacific slab crust under Kanto, central Japan: Possible anomalous thermal shielding, dehydration reactions, and seismicity caused by shallower cold slab material2007

    • Author(s)
      Hasegawa, A., J. Nakajima, S. Kita, T. Okada, T. Matsuzawa, and S. Kirby
    • Journal Title

      Geophys. Res. Lett. 34, L09305, doi:10.1029/2007GL029616

    • Peer Reviewed
  • [Journal Article] Subduction of the Philippine Sea slab beneath southwestern Japan: Slab geometry and its relationship to arc magmatism2007

    • Author(s)
      Nakajima, J., and A. Hasegawa
    • Journal Title

      J. Geophys. Res. 112, B08306, doi:10.1029/2006JB004770

    • Peer Reviewed
  • [Journal Article] Deep crustal structure along the Niigata-Kobe Tectonic Zone, Japan: its origin and segmentation2007

    • Author(s)
      Nakajima, J., and A. Hasegawa
    • Journal Title

      Earth Planets and Space 59

      Pages: e5-e8

    • Peer Reviewed
  • [Journal Article] Tomographic evidence for the mantle upwelling beneath southwestern Japan and its implications for arc magmatism2007

    • Author(s)
      Nakajima, J., and A. Hasegawa
    • Journal Title

      Earth Planet. Sci. Lett. 254

      Pages: 90-105

    • Peer Reviewed
  • [Journal Article] Relocation of the M~7 Miyagi-oki Earthquakes in the 1930s: Seismic Slips of Asperities that Were Re-ruptured during the 1978 M7.4 Miyagi-oki Earthquake? (in Japanese with English abstract)2007

    • Author(s)
      Umino, N., T. Kono, T. Okada, J. Nakajima, T. Matsuzawa, N. Uchida, A. Hasegawa, Y. Tamura, and G. Aoki
    • Journal Title

      J. Seismol. Soc. Japan 59

      Pages: 325-337

    • Peer Reviewed
  • [Journal Article] Existence of a seismic belt in the upper plane of the double seismic zone extending in the along-arc direction at depths of 70-100 km beneath NE Japan2006

    • Author(s)
      Kita, S., T. Okada, J. Nakajima, T. Matsuzawa, and A. Hasegawa
    • Journal Title

      Geophys. Res. Lett. 33, L24310, doi:10.1029/2006GL028239

    • Peer Reviewed
  • [Journal Article] Anomalous low-velocity zone and linear alignment of seismicity along it in the subducted Pacific slab beneath Kanto, Japan: Reactivation of subducted fracture zone?2006

    • Author(s)
      Nakajima, J., and A. Hasegawa
    • Journal Title

      Geophys. Res. Lett. 33, L16309, doi:10.1029/2006GL026773

    • Peer Reviewed
  • [Journal Article] Crustal heterogeneity around the Nagamachi-Rifu fault, northeastern Japan, as inferred from travel-time tomography2006

    • Author(s)
      Nakajima, J., A. Hasegawa, S. Horiuchi, K. Yoshimoto, T. Yoshida, and N. Umino
    • Journal Title

      Earth Planets and Space 58

      Pages: 843-853

    • Peer Reviewed
  • [Journal Article] Shear-wave splitting beneath the southwestern Kurile arc and northeastern Japan arc: A new insight into mantle return flow, Geophys2006

    • Author(s)
      Nakajima, J., J. Shimizu, S. Hori, and A. Hasegawa
    • Journal Title

      Res. Lett. 33, L05305, doi:10.1029/2005GL025023

    • Peer Reviewed
  • [Presentation] 沈み込み帯におけるマグマ生成上昇過程の地震学的研究2008

    • Author(s)
      中島淳一
    • Organizer
      ASC・SSJ合同大会
    • Place of Presentation
      つくば市, つくば国際会議場
    • Year and Date
      2008-11-23
  • [Presentation] 太平洋スラブとフィリピン海スラブの衝突による変形と関東地方の地震テクトニクス2008

    • Author(s)
      中島淳一・長谷川昭・弘瀬冬樹
    • Organizer
      日本地球惑星科学連合2008年大会
    • Place of Presentation
      千葉, 幕張メッセ
    • Year and Date
      2008-05-30
  • [Presentation] Seismological studies on mantle upwelling in NE Japan: Implications for the genesis of arc magmas2007

    • Author(s)
      Nakajima, J., and A. Hasegawa
    • Organizer
      Subduction Factory Studies in the Izu-Bonin-Mariana
    • Place of Presentation
      Honolulu, Marriott Hotel
    • Year and Date
      2007-11-08
  • [Presentation] マントル上昇流の微細構造と島弧マグマ活動2007

    • Author(s)
      中島淳一・長谷川昭
    • Organizer
      日本地震学会2007年秋季大会
    • Place of Presentation
      仙台, 仙台国際センター
    • Year and Date
      2007-10-25
  • [Presentation] Comprehensive studies on an inclined low-velocity zone in the mantle wedge of NE Japan: Implications for the genesis of arc magmas2007

    • Author(s)
      Nakajima, J., and A. Hasegawa
    • Organizer
      EASTEC symposium 2007 Dynamic Earth -its origin and future-
    • Place of Presentation
      Sendai, Sendai City War Reconstruction Memorial Hall
    • Year and Date
      2007-09-18
  • [Presentation] フィリピン海スラブ内の地震活動:上面地震帯と起震応力場2007

    • Author(s)
      中島淳一・長谷川昭・弘瀬冬樹
    • Organizer
      日本地球惑星科学連合2007年大会
    • Place of Presentation
      千葉, 幕張メッセ
    • Year and Date
      2007-05-23
  • [Presentation] 日本周辺のS 波スプリッティング2007

    • Author(s)
      中島淳一・長谷川昭・堀修一郎
    • Organizer
      日本地球惑星科学連合2007年大会
    • Place of Presentation
      千葉, 幕張メッセ
    • Year and Date
      2007-05-22
  • [Presentation] 地震波速度トモグラフィによる新潟-神戸歪集中帯の深部構造2007

    • Author(s)
      中島淳一・長谷川昭
    • Organizer
      日本地球惑星科学連合2007年大会
    • Place of Presentation
      千葉, 幕張メッセ
    • Year and Date
      2007-05-22
  • [Presentation] 合同地震観測データを用いた跡津川断層周辺の三次元地震波速度構造(その3)2007

    • Author(s)
      中島淳一・岩崎貴哉・大見士朗・岡田知己・加藤愛太郎・武田哲也・歪集中帯大学合同地震観測グループ
    • Organizer
      日本地球惑星科学連合2007年大会
    • Place of Presentation
      千葉, 幕張メッセ
    • Year and Date
      2007-05-20
  • [Presentation] 合同地震観測データを用いた跡津川断層周辺の三次元地震波速度構造(その2)2006

    • Author(s)
      中島淳一・加藤愛太郎・岩崎貴哉・大見士朗・岡田知己・武田哲也・歪集中帯大学合同地震観測グループ
    • Organizer
      日本地震学会2006年秋季大会
    • Place of Presentation
      名古屋, 名古屋国際会議場2号館
    • Year and Date
      2006-10-31
  • [Presentation] 紀伊半島下の不均質構造:マントル上昇流とフィリピン海スラブ2006

    • Author(s)
      中島淳一・長谷川昭
    • Organizer
      日本地震学会2006年秋季大会
    • Place of Presentation
      名古屋, 名古屋国際会議場2号館
    • Year and Date
      2006-10-31
  • [Presentation] Tomographic evidence for the mantle upwelling beneath southwestern Japan and its implications for arc magmatism2006

    • Author(s)
      Nakajima, J., and A. Hasegawa
    • Organizer
      5th International Seminar on Seismic Tomography of Far-East Asia and related works
    • Place of Presentation
      Daejeon, KIGAM (Korea Institute of Geoscience and Mineral Resources)
    • Year and Date
      2006-10-27
  • [Presentation] 中部日本の三次元地震波速度構造-マントル上昇流と島弧マグマ活動-2006

    • Author(s)
      中島淳一・長谷川昭
    • Organizer
      日本地球惑星科学連合2006年大会
    • Place of Presentation
      千葉, 幕張メッセ
    • Year and Date
      2006-05-18
  • [Presentation] 合同地震観測データを用いた跡津川断層周辺の三次元地震波速度構造2006

    • Author(s)
      中島淳一・岩崎貴哉・岡田知己・加藤愛太郎・武田哲也・歪集中帯大学合同地震観測グループ
    • Organizer
      日本地球惑星科学連合2006年大会
    • Place of Presentation
      千葉, 幕張メッセ
    • Year and Date
      2006-05-17

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Published: 2010-06-10   Modified: 2016-04-21  

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