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Exploration of the shallow electrical conductivity structure below seafloor by using the ocean dynamo effect

Research Project

Project/Area Number 25610136
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Solid earth and planetary physics
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

HAMANO Yozo  国立研究開発法人海洋研究開発機構, 地球深部ダイナミクス研究分野, 特任上席研究員 (90011709)

Co-Investigator(Kenkyū-buntansha) SUGIOKA Hiroko  神戸大学, 理学研究科, 准教授 (00359184)
TADA Noriko  国立研究開発法人海洋研究開発機構, 地球深部ダイナミクス研究分野, 技術研究員 (00509713)
Project Period (FY) 2013-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords海底電磁気観測 / 電気伝導度 / 電磁気構造探査 / 海洋ダイナモ効果 / 津波 / 短周期磁場変動 / 海底圧力観測 / 電気伝導度構造 / 構造探査 / 電磁気構造
Outline of Final Research Achievements

Based on the theoretical formulation of the ocean dynamo effect, in which ocean currents in the earth’s magnetic field generate the variations of electric and magnetic fields due to the motional induction, we developed a new method for probing the electrical conductivity structure under the seafloor from the seafloor observations of the variations of the electromagnetic filed and pressure change due to ocean currents. Applying the method to the observed data sets, we demonstrated the possibility of estimating the conductivity structure below seafloor by using the signals generated by tsunamis and estimated the application limit of the present method.

Report

(4 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • 2013 Research-status Report
  • Research Products

    (18 results)

All 2016 2015 2014 2013 Other

All Journal Article (8 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 8 results,  Open Access: 4 results,  Acknowledgement Compliant: 2 results) Presentation (10 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results)

  • [Journal Article] Intensity of seismic azimuthal anisotropy in the oceanic lithosphere and as- thenosphere from broadband surface-wave analysis of OBS array records at 60 Ma seafloor2016

    • Author(s)
      Takeo, A., H. Kawakatsu, T. Isse, K. Nishida, H. Sugioka, A. Ito, H. Shiobara, D. Suetsugu
    • Journal Title

      J. Geophys. Res.: Solid Earth

      Volume: 121 Issue: 3 Pages: 1-21

    • DOI

      10.1002/2015jb012429

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Tsunami-induced magnetic fields detected at Chichijima Island before the arrival of the 2011 Tohoku earthquake tsunami2015

    • Author(s)
      Tatehata H, Ichihara H and Hamano Y
    • Journal Title

      Earth, Planets and Space

      Volume: 67:185 Issue: 1 Pages: 1-11

    • DOI

      10.1186/s40623-015-0347-3

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] P and S velocity tomography of the Mariana subduetion system from a combined land-sea seismic deployment2015

    • Author(s)
      Barklage, M., D. A. Wiens, J. A. Conder, S. Pozgay, H. Shiobara, H. Sugioka
    • Journal Title

      Geochemistry, Geophysics, Geosystems

      Volume: 16 Issue: 3 Pages: 681-704

    • DOI

      10.1002/2014gc005627

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Small size very low frequency earthquakes in the Nankai accretionary prism, following the 2011 Tohoku-Oki earthquake2015

    • Author(s)
      To, A., K. Obana, H. Sugioka, E. Araki, N. Takahashi, and Y. Fukao
    • Journal Title

      Physics of the Earth. and Planetary Interiors

      Volume: 245 Pages: 40-51

    • DOI

      10.1016/j.pepi.2015.04.007

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Three-dimensional inversion of seafloor magnetotelluric data collected in the Philippine Sea and the western margin of the northwest Pacific Ocean2014

    • Author(s)
      Noriko Tada, Kiyoshi Baba, Hisashi Utada
    • Journal Title

      Geochemistry, Geophysics, Geosystems

      Volume: 15 Issue: 7 Pages: 2895-2917

    • DOI

      10.1002/2014gc005421

    • Related Report
      2014 Research-status Report
    • Peer Reviewed
  • [Journal Article] Tsunami : Ocean dynamo generator2014

    • Author(s)
      Sugioka, H., Y. Hamano, K. Baba, T. Kasaya, N. Tada, D. Suetsugu
    • Journal Title

      Scientific Reports

      Volume: 4 Issue: 1 Pages: 1-7

    • DOI

      10.1038/srep03596

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Practical incorporation of local and regional topography in three-dimensional inversion of deep ocean magnetotelluric data2013

    • Author(s)
      K. Baba
    • Journal Title

      Geophysical journal International

      Volume: 194 Pages: 348-361

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] A continuously towed vertical bipole source for marine magnetometric resistivity surveying2013

    • Author(s)
      N. Seama
    • Journal Title

      Earth Planets and Space

      Volume: 65 Pages: 883-891

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Presentation] NX-2G: autonomous BBOBS-NX for a highly mobile broadband seismic and tilt observation at the seafloor2015

    • Author(s)
      Shiobara, H., M. Shinohara, H. Sugioka, A. Ito,
    • Organizer
      OCEANS 2015
    • Place of Presentation
      Washington DC, USA
    • Year and Date
      2015-10-21
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Infragravity waves, Tsunami, and Ocean tides observed by a deep sea differential pressure gauge (DPG) ; Development, calibrations and performance2015

    • Author(s)
      Sugioka, H.
    • Organizer
      2015 OBS symposium
    • Place of Presentation
      Vancouver, Washington, USA
    • Year and Date
      2015-10-04
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 広帯域海底地震観測によるソサエティ・ホットスポット下のマントル遷移構造の推定2015

    • Author(s)
      末次大輔・杉岡裕子・一瀬建日・伊藤亜妃・塩原肇
    • Organizer
      日本地球惑星科学連合大会2015
    • Place of Presentation
      幕張メッセ、千葉県千葉市
    • Year and Date
      2015-05-25
    • Related Report
      2015 Annual Research Report
  • [Presentation] Oceanic plate structures beneath the northwestern Pacific Ocean revealed by explosion experiments2014

    • Author(s)
      ISSE TAKEHI , Shiobara Hajime , SHINOHARA MASANAO , YAMADA TOMOAKI , Yagi Takeo, SUGIOKA HIROKO , Utada Hisashi
    • Organizer
      AGU Fall meeting 2014
    • Place of Presentation
      San Francisco, USA
    • Year and Date
      2014-12-15
    • Related Report
      2014 Research-status Report
  • [Presentation] ベクトル津波計リアルタイム観測に向けたWave Gliderの長期運用2014

    • Author(s)
      浜野洋三、杉岡裕子、藤浩明
    • Organizer
      日本地球惑星科学連合2014年大会
    • Place of Presentation
      パシフィコ横浜、神奈川県横浜市
    • Year and Date
      2014-05-01
    • Related Report
      2014 Research-status Report
  • [Presentation] 海底地震計記録を用いた北西太平洋域の構造推定: 短周期成分(>1 Hz)の活用2014

    • Author(s)
      利根川 貴志, 深尾 良夫, 藤江 剛, 高橋 努, 小平 秀一, 杉岡 裕子, 伊藤 亜妃
    • Organizer
      日本地球惑星科学連合2014年大会
    • Place of Presentation
      パシフィコ横浜、神奈川県横浜市
    • Year and Date
      2014-04-29
    • Related Report
      2014 Research-status Report
  • [Presentation] The three-dimensional conductivity structure beneath the Philippine Sea and the western Pacific Ocean

    • Author(s)
      N. Tada
    • Organizer
      2013 Japan Geoscience Union Meeting
    • Place of Presentation
      幕張メッセ国際会議場、千葉市
    • Related Report
      2013 Research-status Report
  • [Presentation] First report on electrical conductivity imaging of ”Normal Oceanic Mantle"

    • Author(s)
      K. Baba
    • Organizer
      2013 Japan Geoscience Union Meeting
    • Place of Presentation
      幕張メッセ国際会議場、千葉市
    • Related Report
      2013 Research-status Report
  • [Presentation] Structural heterogeneities around the shallow megathrust zone of the 2011 Tohoku earthquake

    • Author(s)
      Y. Yamamoto
    • Organizer
      2013 Japan Geoscience Union Meeting
    • Place of Presentation
      幕張メッセ国際会議場、千葉市
    • Related Report
      2013 Research-status Report
  • [Presentation] First seafloor observation of Vector Tsunameter

    • Author(s)
      Y. Hamano
    • Organizer
      2013 Japan Geoscience Union Meeting
    • Place of Presentation
      幕張メッセ国際会議場、千葉市
    • Related Report
      2013 Research-status Report

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Published: 2014-07-25   Modified: 2019-07-29  

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