Imaging of the Polynesian mantle plumes from seismic and geomagnetic observation on seafloor in French Polynesia

2009 Fiscal Year Self-evaluation Report

• Project/Area Number: 19253004
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Solid earth and planetary physics
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: SUETSUGU Daisuke Japan Agency for Marine-Earth Science and Technology, 地球内部ダイナミクス領域, チームリーダー (20359178)
• Project Period (FY): 2007 – 2010
• Keywords: ホットスポット / マントルプルーム / 海底地震計 / 海底電磁気計 / トモグラフィー

Research Abstract

本研究の目的は、仏領ポリネシア地域のソサエティー・ホットスポット(タヒチ島の南東200km)下のマントル構造を地震学的及び地球電磁気学的に推定し、ホットスポットの原因と考えられるマントル・プルーム(上昇流)の形状、温度異常、組成異常、そして起源深度を明らかにすることである。そのために、ソサエティー・ホットスポット海域に広帯域海底地震計(BBOBS)及び海底磁力計(OBEM)を1年間設置する。回収されるデータを用いて地震波トモグラフィーと電磁気トモグラフィーを行い、マントル・プルームの地震波速度・電気伝導度構造を求めて、プルームの形状、深度、温度・組成異常を推定する。

Research Products

• [Journal Article] South Pacific hotspot swells dynamically supported by mantle flows (2010)
  • Author(s): Adam, C., M. Yoshida, T. Isse, D. Suetsugu, Y. Fukao, G. Barruol
  • Journal Title: Geophys.Res.Lett. 37(印刷中)
  • Peer Reviewed
• [Journal Article] South Pacific mantle plumes imaged by seismic observation on islands and seafloor (2009)
  • Author(s): Suetsugu, D., T. Isse, S. Tanaka, M. Obayashi, H. Shiobara, H. Sugioka, T. Kanazawa, Y. Fukao, G. Barruol, D. Reymond
  • Journal Title: Geochemistry, Geophysics, Geosystem 10 Pages: Q11014, doi:10.1029/2009GC002533
  • Peer Reviewed
• [Journal Article] Mapping upper mantle flow beneath French Polynesia from broadband ocean bottom seismic observations (2009)
  • Author(s): Barruol, G., D. Suetsugu, H. Shiobara, H. Sugioka, S. Tanaka, G. H. R. Bokelmann, F. R. Fontaine, D. Reymond
  • Journal Title: Geophys.Res.Lett. 36 Pages: L14301, doi:10.1029/2009GL038139
  • Peer Reviewed
• [Journal Article] The vertical extent of the large low shear velocity province beneath the South Pacific Superswell (2009)
  • Author(s): Tanaka, S., D. Suetsugu, H. Shiobara, H. Sugioka, T. Kanazawa, Y. Fukao, G. Barruol, D. Reymond
  • Journal Title: Geophys.Res.Lett. 36 Pages: L07305, doi:10.1029/2009GL037568
  • Peer Reviewed
• [Journal Article] P-wave tomography of the mantle beneath the South Pacific Superswell revealed by joint ocean floor and islands broadband seismic experiments (2008)
  • Author(s): Tanaka, S., D. Suetsugu, M. Obayashi, H. Shiobara, H. Sugioka, Y. Fukao, T. Kanazawa, G. Burruol
  • Journal Title: Phys.Earth Planet.Inter. 172 Pages: 268-277
  • Peer Reviewed
• [Presentation] First step for mobile ocean bottom broadband seismic observation of the next generation (2008)
  • Author(s): Shiobara, H.
  • Organizer: AGU 2008 Fall meeting
  • Place of Presentation: Moscone Center, San Francisco, USA.
  • Year and Date: 2008-12-17
• [Presentation] S-wave velocity structure beneath the South Pacific superswell, derived from passive seismic experiments (2008)
  • Author(s): Tanaka, S.
  • Organizer: AGU 2008 Fall meeting
  • Place of Presentation: Moscone Center, San Francisco, USA
  • Year and Date: 2008-12-15
• [Presentation] P-wave travel time tomography in the mantle beneath the South Pacific superswell (2008)
  • Author(s): Tanaka, S.
  • Organizer: the 7th General Assembly of Asian Seismological Comission
  • Place of Presentation: つくば国際会議場
  • Year and Date: 2008-11-25
• [Presentation] French Polynesia hotspot swells explained by dynamic topography (2007)
  • Author(s): Adam, C.
  • Organizer: AGU 2007 Fall meeting
  • Place of Presentation: Moscone Center, San Francisco, USA
  • Year and Date: 2007-12-11
• [Presentation] Seismic image of the South Pacific superswell (2007)
  • Author(s): Suetsugu, D.
  • Organizer: SOPAC 2007 annual meeting
  • Place of Presentation: ヌクアロファ (トンガ王国)
  • Year and Date: 2007-11-22
• [Book] 階層構造の科学 (2007)
  • Author(s): 阪口秀, 草野完也, 末次大輔
  • Total Pages: 1-227
  • Publisher: 東京大学出版会