Three dimensional electrical conductivity distribution of the upper mantle around slab and mantle plume

• Project/Area Number: 23740346
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Solid earth and planetary physics
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: TADA Noriko 独立行政法人海洋研究開発機構, 地球内部ダイナミクス領域, 技術研究副主任 (00509713)
• Project Period (FY): 2011 – 2013
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2012: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
• Keywords: マグネトテルリック法 / 海底電磁気データ / 三次元インバージョン / 三次元電気伝導度構造 / 海洋上部マントル / フィリピン海 / ソサエティー・ホットスポット / 国際研究者交流 / フランス / 3次元電気伝導度構造 / フィリピン海上部マントル / ホットスポット / Magnetotelluric法 / 地形効果 / マントルプルーム / フレンチポリネシア / スタグナントスラブ

Research Abstract

We revealed the three-dimensional electrical conductivity structure in the upper mantle beneath the Philippine Sea by applying seafloor electromagnetic data to the three-dimensional marine magnetotelluric inversion scheme. We also discussed the importance of incorporating topography around observation sites and choosing a proper initial model. The estimated electrical conductivity structure was verified by resolution and sensitivity tests.
We analyzed seafloor electromagnetic data obtained around the Society hotspot in French Polynesia, and found the conductivity anomaly elongating from the mantle transition zone to the uppermost mantle just below the hotspot.

Research Products

• [Journal Article] Practical incorporation of local and regional topography in three-dimensional inversion of deep ocean magnetotelluric data (2013)
  • Author(s): Kiyoshi Baba
  • Journal Title: Geophys. J. Int. Volume: 194 Issue: 1 Pages: 348-361
  • DOI: 10.1093/gji/ggt115
  • Peer Reviewed
• [Journal Article] A continuously towed vertical bipole source for marine magnetometric resistivity surveying (2013)
  • Author(s): Nobukazu Seama, Noriko Tada, Tada-nori Goto, Masashi Shimoizumi
  • Journal Title: Earth Planets Space Volume: -
  • NAID: 40019859495
  • Peer Reviewed
• [Journal Article] Approximate treatment of seafloor topographic effects in three-dimensional marine magnetotelluric inversion (2012)
  • Author(s): Noriko Tada, Kiyoshi Baba, Weerachai Shiripunvaraporn, Makoto Uyeshima, Hisashi Utada
  • Journal Title: Earth, Planets and Space Volume: Vol.64 Issue: 11 Pages: 1005-1021
  • DOI: 10.5047/eps.2012.04.005
  • NAID: 10031141572
  • ISSN: 1343-8832, 1880-5981
  • Peer Reviewed
• [Journal Article] TIARES Project -Tomographic investigation by seafloor array experiment for the Society hotspot (2012)
  • Author(s): Daisuke Suetsugu, Hajime Shiobara, Hiroko Sugioka, Aki Ito, Takehi Isse, Takafumi Kasaya, Noriko Tada et al.
  • Journal Title: Earth Planets Space Volume: 64
  • NAID: 10030775296
  • Peer Reviewed
• [Journal Article] Approximate treatment of seafloor topographic effects in three-dimensional marine magnetotelluric inversion (2012)
  • Author(s): Noriko Tada, Kiyoshi Baba, Weerachai Siripunvaraporn, Makoto Uyeshima,Hisashi Utada
  • Journal Title: Earth Planets Space Volume: 64 Pages: 1005-1021
  • NAID: 10031141572
  • Peer Reviewed
• [Presentation] Three-dimensional analysis technique for marine magnetotelluric method (2013)
  • Author(s): Noriko Tada
  • Organizer: 日本地球惑星科学連合2013年大会
  • Place of Presentation: 幕張メッセ, 千葉県
  • Year and Date: 2013-05-22
• [Presentation] Three-dimensional electrical conductivity structure beneath the Philippine Sea using three-dimensional marine MT inversion dealing with topographic effect (2013)
  • Author(s): Noriko Tada, Kiyoshi Baba, Hisashi Utada
  • Organizer: 5th International Symposium on Three-Dimensional Electromagnetics "Future Challenges"
  • Place of Presentation: 北海道大学, 北海道
  • Year and Date: 2013-05-09
• [Presentation] The three-dimensional conductivity structure beneath the Philippine Sea and the western Pacific Ocean (2013)
  • Author(s): Noriko Tada, Kiyoshi Baba, Hisashi Utada
  • Organizer: JpGU2013
  • Place of Presentation: 幕張メッセ、千葉県
• [Presentation] The three-dimensional conductivity structure in the upper mantle beneath the Philippine Sea and the western Pacific Ocean (2013)
  • Author(s): Noriko Tada, Kiyoshi Baba, Hisashi Utada
  • Organizer: 地球電磁気・地球惑星圏学会 第１３４回総会及び講演会
  • Place of Presentation: 高知大学、高知県
• [Presentation] Ocean bottom measurements of the Earth’s electric field using long cable installed by ROV (2013)
  • Author(s): Hishasi Utada, Kiyoshi Baba, Hisayoshi Shimizu, Hajime Shiobara, Noriko Tada
  • Organizer: Underwater Technology 2013
  • Place of Presentation: Komaba Research Campus, The University of Tokyo
• [Presentation] Practical incorporation of topography in three-dimensional inversion of marine magnetotelluric data (2012)
  • Author(s): Kiyoshi Baba, Noriko Tada, Hisashi Utada, Weerachai Siripunvaraporn
  • Organizer: 21st EM Induction Workshop
  • Place of Presentation: Darwin, Australia
• [Presentation] The three-dimensional conductivity structure of the stagnant slab (2012)
  • Author(s): 多田訓子, 馬場聖至, 歌田久司
  • Organizer: 日本地球惑星科学連合2012年度連合大会
  • Place of Presentation: 幕張メッセ国際会議場
• [Presentation] Three-dimensional electrical conductivity structure of the Philippine Sea upper mantle using marine magnetotelluric data (2012)
  • Author(s): Noriko Tada, Kiyoshi Baba, Hisashi Utada
  • Organizer: 21st EM Induction Workshop
  • Place of Presentation: Darwin, Australia
• [Presentation] ソサエティー・ホットスポットの海底アレイ観測によるトモグラフィー研究 (TIARES)計画 : 海底電磁気観測の速報 (2011)
  • Author(s): 多田 訓子、笠谷 貴史、馬場 聖至、浜野 洋三、阿部 なつ江、末次 大輔
  • Organizer: 地球電磁気・地球惑星圏学会 第130回総会及び講演会
  • Place of Presentation: 神戸大学、兵庫県
  • Year and Date: 2011-11-05
• [Presentation] Importance of treating seafloor topography in inversion of 3-D marine MT data (2011)
  • Author(s): Noriko Tada, Kiyoshi Baba, Hisahsi Utada, Weerachai Siripunvaraporn, Makoto Uyeshima
  • Organizer: European Geosiences Union (EGU) General Assembly 2011
  • Place of Presentation: Austria Center Vienna, ウィーン
  • Year and Date: 2011-04-06
• [Presentation] 海底地形効果の3 次元海底MTインバージョンへの組込み (2011)
  • Author(s): 多田訓子, 馬場聖至, 歌田久司
  • Organizer: 日本地球惑星科学連合2011年度連合大会
  • Place of Presentation: 幕張メッセ
• [Presentation] ソサエティーホットスポット（仏領ポリネシア）付近での海底地球物理観測 (2011)
  • Author(s): 末次大輔, 塩原肇, 杉岡裕子, 伊藤亜妃, 一瀬建日, 馬場聖至, 笠谷貴史, 多田訓子
  • Organizer: 日本地球惑星科学連合2011年度連合大会
  • Place of Presentation: 幕張メッセ
• [Presentation] ポリネシア海底地球物理ネットワークによって観測された津波電磁気シグナル (2011)
  • Author(s): 浜野洋三, 杉岡裕子, 笠谷貴史, 馬場聖至, 多田訓子, 塩原肇, 伊藤亜妃, 一瀬建日, 末次大輔
  • Organizer: 日本地球惑星科学連合2011年度連合大会
  • Place of Presentation: 幕張メッセ
• [Presentation] ソサエティー・ホットスポットの海底アレイ観測によるトモグラフィー研究 （TIARES）計画：海底電磁気観測の速報 (2011)
  • Author(s): 多田訓子, 笠谷貴史, 馬場聖至, 浜野洋三, 阿部なつ江, 末次大輔
  • Organizer: 地球電磁気・地球惑星圏学会 第１３０回総会及び講演会
  • Place of Presentation: 神戸大学
• [Presentation] Importance of treating seafloor topography in inversion of 3-D marine MT data (2011)
  • Author(s): Noriko Tada, Kiyoshi Baba, Hisashi Utada, Weerachai Siripunvaraporn, Makoto Uyeshima
  • Organizer: EGU2011
  • Place of Presentation: ウィーン, Austria Center Vienna
• [Presentation] Ocean bottom geophysical observation on the seafloor near the Society hot spot, French Polynesia (2011)
  • Author(s): Daisuke Suetsugu, Hajime Shiobara, Tatehi Isse, Hiroko Sugioka, Aki Ito, Kiyoshi Baba, Takafumi Kasaya, Noriko Tada, Dominique Reymond, Jean-Pierre Barriot
  • Organizer: EGU2011
  • Place of Presentation: ウィーン, Austria Center Vienna
• [Presentation] Three-dimensional analysis technique for marine magnetotelluric method
  • Author(s): Noriko Tada
  • Organizer: JpGU2013
  • Place of Presentation: 幕張メッセ、千葉県
• [Presentation] Three-dimensional electrical conductivity structure beneath the Philippine Sea using three-dimensional marine MT inversion dealing with topographic effect
  • Author(s): Noriko Tada, Kiyoshi Baba, Hisashi Utada
  • Organizer: 5th International Symposium on Three-Dimensional Electromagnetics “Future Challenges”
  • Place of Presentation: 北海道大学、北海道