Study on a mantle upwelling in southwestern Japan and its tectonic implications

• Project/Area Number: 21740318
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Solid earth and planetary physics
• Research Institution: Tohoku University
• Principal Investigator: NAKAJIMA Junichi 東北大学, 大学院・理学研究科, 准教授 (30361067)
• Project Period (FY): 2009 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000); Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2009: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 地震波速度構造 / トモグラフィ / 上昇流 / 紀伊半島 / 地震波速度トモグラフィ / 地震波形 / スペクトル / 低周波地震 / 流体

Research Abstract

We estimated three-dimensional seismic velocity and attenuation structures beneath southwestern Japan using a large number of high-quality seismic waveform data. The obtained results that a large low-velocity and high-attenuation zone is distributed in the upper mantle and appears to penetrate into the Philippine Sea slab locally beneath the Kii Peninsula. Seismo-and volcano-tectonics beneath SW Japan may be controlled by the mantle upwelling which is probably related to deep dehydration of the Pacific slab.

Research Products

• [Journal Article] Seismic evidence for reactivation of a buried hydrated fault in the Pacific slab by the 2011 M9.0 Tohoku Earthquake (2011)
  • Author(s): Nakajima, J., A.Hasegawa, S.Kita
  • Journal Title: Geophys. Res. Lett. Volume: 38 Issue: 16 Pages: n/a-n/a
  • DOI: 10.1029/2011gl048754
  • Peer Reviewed
• [Journal Article] Seismic evidence for reactivation of a buried hydrated fault in the Pacific slab by the 2011 M9.0 Tohoku earthquake (2011)
  • Author(s): Nakajima, J., A.Hasegawa, S.Kita
  • Journal Title: Geophys.Res.Lett. Volume: 38 Issue: 7 Pages: 2-4
  • DOI: 10.1029/2011gl048432
  • Peer Reviewed
• [Journal Article] Group for the aftershock observations of the 2011 off the Pacific Coast of Tohoku Earthquake (2011)
  • Author(s): Okada, T., K. Yoshida, S. Ueki, J. Nakajima, N. Uchida, T. Matsuzawa, N. Umino, A. Hasegawa
  • Journal Title: Shallow inland earthquakes in NE Japan possibly triggered by the 2011 off the Pacific coast of Tohoku Earthquake, Earth Planets and Space Volume: 63 Pages: 749-754
  • Peer Reviewed
• [Journal Article] Lateral variation of the cutoff depth of shallow earthquakes beneath the Japan Islands and its implications for seismogenesis (2011)
  • Author(s): Omuralieva Aimjan、Akira Hasegawa, Toru Matsuzawa, Junichi Nakajima, Tomomi Okada
  • Journal Title: Tectonophysics Volume: 518 Pages: 93-105
  • Peer Reviewed
• [Journal Article] Earthquakes and plastic deformation of anhydrous slab mantle in double Wadati-Benioff zones (2010)
  • Author(s): Reynard, B., J. Nakajima, and H. Kawakatsu
  • Journal Title: Geophy. Res. Lett. Volume: 37 Issue: 24
  • DOI: 10.1029/2010gl045494
  • Peer Reviewed
• [Journal Article] Existence of interplane earthquakes and neutral stress boundary between the upper and lower planes of the double seismic zone beneath Tohoku and Hokkaido (2010)
  • Author(s): Kita, S., T. Okada, A. Hasegawa, J. Nakajima, and T. Matsuzawa
  • Journal Title: northeastern Japan, Tectonophysics Volume: 496 Pages: 68-82
  • Peer Reviewed
• [Journal Article] and The Japanese University Group of the Joint Seismic Observations at NKTZ, Deep crustal structure around the Atotsugawa fault system, central Japan : A weak zone below the seismogenic zone and its role in earthquake generation (2010)
  • Author(s): Nakajima, J., A. Kato, T. Iwasaki, S. Ohmi, T. Okada, T. Takeda
  • Journal Title: Earth Planets and Space Volume: 62 Pages: 555-566
  • Peer Reviewed
• [Journal Article] Subduction of a wedge-shaped Philippine Sea plate beneath Kanto, central Japan, estimated from converted waves and small repeating earthquakes (2010)
  • Author(s): Uchida, N., T. Matsuzawa, J. Nakajima, and A. Hasegawa
  • Journal Title: J. Geophys. Res. Volume: 115 Issue: B7
  • DOI: 10.1029/2009jb006962
  • Peer Reviewed
• [Journal Article] Anomalous deepening of a seismic belt in the upper-plane of the double seismic zone in the Pacific slab beneath the Hokkaido corner : Possible evidence for thermal shielding caused by subducted forearc crust materials (2010)
  • Author(s): Kita, S., T. Okada, A. Hasegawa, J. Nakajima, and T. Matsuzawa
  • Journal Title: Earth Planet. Sci. Lett. Volume: 290 Pages: 415-426
  • Peer Reviewed
• [Journal Article] Cause of M7 earthquakes beneath the Tokyo metropolitan area, Japan : Possible evidence for a vertical tear at the easternmost portion of the Philippine Sea slab (2010)
  • Author(s): Nakajima, J., and A. Hasegawa
  • Journal Title: J. Geophys. Res. Volume: 115 Issue: B4
  • DOI: 10.1029/2009jb006863
  • Peer Reviewed
• [Journal Article] Cause of M7 earthquakes beneath the Tokyo metropolitan area, Japan : Possible evidence for a vertical tear at the easternmost portion of the Philippine Sca slab (2010)
  • Author(s): 中島淳一・長谷川昭
  • Journal Title: Journal of Geophysical Research Volume: 115
  • Peer Reviewed
• [Journal Article] 日本列島下での沈み込みプロセスの多様性 (2010)
  • Author(s): 片山郁夫・平内健一・中島淳一
  • Journal Title: 地学雑誌 Volume: 119 Pages: 190-204
  • NAID: 10030368419
  • Peer Reviewed
• [Journal Article] Tectonic setting of volcanic centers in subduction zones : 3D structure of mantle wedge and arc crust (2009)
  • Author(s): Tamura, Y., J. Nakajima, S. Kodaira, and A. Hasegawa
  • Journal Title: In Volcanic and Tectonic Hazard Assessment for Nuclear Facilities, edited by Conner, C., Chapman, N. A, Conner, L. Pages: 177-194
  • Peer Reviewed
• [Journal Article] Helium isotope variations along the Niigata-Kobe Tectonic Zone, central Japan, In The Lithosphere ; Geochemistry, Geology and Geophysics, edited by Anderson, J. E., and Coates, R. W. (2009)
  • Author(s): Umeda, K., A. Ninomiya, K. Shimada, and J. Nakajima
  • Journal Title: Nova Science Publisher Inc. Pages: 141-170
  • Peer Reviewed
• [Journal Article] Seismotectonics beneath the Tokyo metropolitan area, Japan : Effect of slab-slab contact and overlap on seismicity (2009)
  • Author(s): Nakajima, J., F. Hirose, and A. Hasegawa
  • Journal Title: J. Geophys. Res. Volume: 114
  • Peer Reviewed
• [Journal Article] Izu-Bonin arc subduction under the Honshu island, Japan : Evidence from geological and seismological aspect (2009)
  • Author(s): Yamamoto, S., J. Nakajima, A. Hasegawa, and S. Maruyama
  • Journal Title: Gondwana Research Volume: 16 Pages: 572-580
  • Peer Reviewed
• [Journal Article] What controls interplate coupling? : Evidence for abrupt change in coupling across a border between two overlying plates in the NE Japan subduction zone (2009)
  • Author(s): Uchida, N., J. Nakajima, A. Hasegawa, and T. Matsuzawa
  • Journal Title: Earth Planet. Sci. Lett Volume: 283 Pages: 111-121
  • Peer Reviewed
• [Journal Article] Plate subduction, and generation of earthquakes and magmas in Japan as inferred from seismic observations (2009)
  • Author(s): Hasegawa, A., J. Nakajima, N. Uchida, T. Okada, D. Zhao, T. Matsuzawa, and N. Umino
  • Journal Title: An overview, Gondwana Research Volume: 16 Pages: 370-400
  • Peer Reviewed
• [Journal Article] Seismic evidence for thermally-controlled dehydration reaction in subducting oceanic crust (2009)
  • Author(s): Nakajima, J., Y.Tsuji, and A.Hasegawa
  • Journal Title: Geophys. Res. Lett. Volume: 36 Issue: 3
  • DOI: 10.1029/2008gl036865
  • Peer Reviewed
• [Journal Article] Tomographic imaging of hydrated crust and mantle in the subducting Pacific slab beneath Hokkaido, Japan : Evidence for dehydration embrittlement as a cause of intraslab earthquakes (2009)
  • Author(s): Nakajima, J., Y. Tsuji, A. Hasegawa, S. Kita, T. Okada, and T. Matsuzawa
  • Journal Title: Gondwana Research Volume: 16 Pages: 470-481
  • Peer Reviewed
• [Journal Article] Tracing extinct spreading center in SW Japan by helium-3 emanation (2009)
  • Author(s): Sano, Y., A. Kameda, N. Takahata, J. Yamamoto, and J. Nakajima
  • Journal Title: Chemical Geology Volume: 266 Pages: 50-56
  • Peer Reviewed
• [Journal Article] hree-dimensional seismic velocity structure of the crust beneath the central Tien Shan, Kyrgyzstan (2009)
  • Author(s): Omuralieva, A., J. Nakajima, and A. Hasegawa
  • Journal Title: Implications for large-and small-scale mountain building. Tectonophysics Volume: 465 Pages: 30-44
  • Peer Reviewed
• [Journal Article] 地震波トモグラフィでみたスラブの沈み込みと島弧マグマ活動 (2009)
  • Author(s): 中島淳一
  • Journal Title: 地震 61
  • NAID: 10025365258
  • Peer Reviewed
• [Presentation] An intraslab earthquake (M7. 1)along a buried hydrated fault in the Pacific plate, triggered by the 2011 M9 Tohoku earthquake (2011)
  • Author(s): Nakajima, J., A. Hasegawa, S. Kita
  • Organizer: AGU Fall Meeting 2011, San Francisco
  • Place of Presentation: Moncone Center
  • Year and Date: 2011-12-09
• [Presentation] An intraslab earthquake (M7.1) along a buried hydrated fault in the Pacific plate, triggered by the 2011 M9 Tohoku earthquake (2011)
  • Author(s): Junichi Nakajima, Akira Hasegawa, Saeko Kita
  • Organizer: American Geophysical Union 2011 Fall Meeting
  • Place of Presentation: アメリカ,サンフランシスコ,モスコンセンター
  • Year and Date: 2011-12-09
• [Presentation] 東北地方太平洋沖地震と誘発地震-4月7日のスラブ内地震(M7. 1)について- (2011)
  • Author(s): 中島淳一・長谷川昭・北佐枝子
  • Organizer: 日本地震学会2011年秋季大会
  • Place of Presentation: グランシップ静岡
  • Year and Date: 2011-10-13
• [Presentation] 東北地方太平洋沖地震と誘発地震～4月7日のスラブ内地震(M7.1)について～ (2011)
  • Author(s): 中島淳一・長谷川昭・北佐枝子・太田雄策・大園真子・三浦哲
  • Organizer: 日本地震学会2011年秋季大会
  • Place of Presentation: グランシップ静岡
  • Year and Date: 2011-10-13
• [Presentation] スペクトル比法を用いたコーナー周波数の推定と東北地方の地震波減衰構造(その2) (2011)
  • Author(s): 羽田周平・中島淳一・内田直希・速水絵里圭・海野徳仁
  • Organizer: 日本地震学会2011年秋季大会
  • Place of Presentation: グランシップ静岡
  • Year and Date: 2011-10-13
• [Presentation] Seismic imaging of slab structure and its relation to seismicity (2011)
  • Author(s): Nakajima, J.
  • Organizer: Workshop on Ocean Mantle Dynamics : From Spreading Center to Subduction
  • Place of Presentation: 東大柏の葉キャンパス
  • Year and Date: 2011-10-05
• [Presentation] Seismic imaging of slab structure and its relation to seismicity (2011)
  • Author(s): Junichi Nakajima
  • Organizer: Workshop on Ocean Mantle Dynamics : From Spreading Center to Subduction
  • Place of Presentation: 東京大学柏の葉キャンパス
  • Year and Date: 2011-10-05
• [Presentation] フィリピン海スラブ内の起震応力場と関東地震のアスペリティ (2011)
  • 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2011年大会
  • Place of Presentation: 幕張メッセ
  • Year and Date: 2011-05-27
• [Presentation] フィリピン海プレートの沈み込みと関東地方の地震テクトニクス (2010)
  • Author(s): 中島淳一・長谷川昭
  • Organizer: 日本地震学会2010年秋季大会
  • Place of Presentation: 広島国際会議場
  • Year and Date: 2010-10-27
• [Presentation] Seismic evidence for dehydration reactions in the subducting oceanic plates (2010)
  • Author(s): Nakajima, J., A. Hasegawa
  • Organizer: G-COE Symposium 2010 Dynamic Earth and Heterogeneous Structure
  • Place of Presentation: Sendai City War Reconstruction Memorial Hall
  • Year and Date: 2010-07-15
• [Presentation] 地震波トモグラフィで診る日本列島下の上部マントル構造 (2010)
  • Author(s): 中島淳一
  • Organizer: 日本地球惑星科学連合2010年大会
  • Place of Presentation: 幕張メッセ
  • Year and Date: 2010-05-23
• [Presentation] 前弧マントルウエッジは含水化しているか? (2010)
  • Author(s): 中島淳一・長谷川昭
  • Organizer: 日本地球惑星科学連合2010年大会
  • Place of Presentation: 幕張メッセ
  • Year and Date: 2010-05-23
• [Presentation] 伊豆前弧マントルウエッジの蛇紋岩化:関東下の地震波速度構造からの考察 (2010)
  • Author(s): 中島淳一・長谷川昭
  • Organizer: 日本地球惑星科学連合2010年大会
  • Place of Presentation: 幕張メッセ
  • Year and Date: 2010-05-23
• [Presentation] 地震波トモグラフィで診る日本列島下の上部マントル構造 (2010)
  • Author(s): 中島淳一
  • Organizer: 日本地球惑星科学連合2010年大会
  • Place of Presentation: 幕張メッセ国際会議場
  • Year and Date: 2010-05-23
• [Presentation] 関東下におけるフィリピン海スラブの断裂-スラブ内地震(M7)との関連- (2009)
  • Author(s): 中島淳一・長谷川昭
  • Organizer: 日本地震学会2009年秋季大会
  • Place of Presentation: 京都大学
  • Year and Date: 2009-10-22
• [Presentation] スラブ内地震の発生機構-地震学的データによる脱水脆性化説の検証- (2009)
  • Author(s): 中島淳一・長谷川昭
  • Organizer: 日本地球惑星科学連合2009年大会
  • Place of Presentation: 幕張メッセ
  • Year and Date: 2009-05-23
• [Presentation] 地震波速度トモグラフィで診るひずみ集中帯の深部構造 (2009)
  • Author(s): 中島淳一
  • Organizer: 日本地球惑星科学連合2009年大会
  • Place of Presentation: 幕張メッセ
  • Year and Date: 2009-05-20
• [Presentation] 歪集中帯大学合同地震観測グループ, 跡津川断層周辺の三次元地震波速度構造-断層深部の低速度領域- (2009)
  • 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
  • Organizer: 日本地球惑星科学連合2009年大会
  • Place of Presentation: 幕張メッセ
  • Year and Date: 2009-05-17
• [Presentation] スラブ内地震の発生機構～地震学的データによる脱水脆性化説の検証～ (2009)
  • Author(s): 中島淳一
  • Organizer: 日本地球惑星科学連合2009年大会
  • Place of Presentation: 幕張メッセ国際会議場
  • Year and Date: 2009-05-16