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Structure and dynamics of the Earth's inner core boundary-The origin of hemispherical structure-

Research Project

Project/Area Number 21340132
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Solid earth and planetary physics
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

TANAKA Satoru  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, 主任研究員 (60281961)

Co-Investigator(Kenkyū-buntansha) MATSUSHIMA Masaki  東京工業大学, 理工学研究科, 助教 (20242266)
SHIMIZU Hisayoshi  東京大学, 地震研究所, 准教授 (70302619)
Project Period (FY) 2009 – 2012
Project Status Completed (Fiscal Year 2012)
Budget Amount *help
¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
Fiscal Year 2012: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2011: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2010: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2009: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Keywords内核境界 / 内核成長 / ダイナモシミュレーション
Research Abstract

Hemispherical difference of the inner core reaches at least 400km below the inner core boundary. Attenuation of seismic wave passing through the Eastern hemisphere can be explained by velocity perturbation within the uppermost 200km of the inner core. The reflected waves at the inner core boundary in the Eastern hemisphere show that 2Hz components are larger than those of 1Hz. The stability of morphology at the inner core surface depends on the growth rate of the inner core. Diffusivity affects kinetic and magnetic (in some case) energies of the outer core flow near the inner core boundary.

Report

(5 results)
  • 2012 Annual Research Report   Final Research Report ( PDF )
  • 2011 Annual Research Report
  • 2010 Annual Research Report
  • 2009 Annual Research Report
  • Research Products

    (32 results)

All 2013 2012 2011 2010 2009 Other

All Journal Article (5 results) (of which Peer Reviewed: 5 results) Presentation (24 results) (of which Invited: 1 results) Book (2 results) Remarks (1 results)

  • [Journal Article] One-dimensional modeling of multiple scattering in the upper inner core: Depth extent of a scattering region in the Eastern hemisphere2013

    • Author(s)
      Tanaka, S
    • Journal Title

      J. Earth Sci

      Volume: (in press)

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] One-dimensional modeling of multiple scattering in the upper inner core: Depth extent of a scattering region in the Eastern hemisphere2013

    • Author(s)
      Tanaka, S.
    • Journal Title

      J. Earth Sci.

      Volume: 印刷中

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The effect of anisotropic diffusivity on rotating magnetoconvection in the Earth's core2012

    • Author(s)
      Matsushima, M
    • Journal Title

      Geophys. Astrophys. Fluid Dyn

      Volume: 106 Issue: 6 Pages: 630-642

    • DOI

      10.1080/03091929.2011.641959

    • Related Report
      2012 Annual Research Report 2012 Final Research Report 2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Depth extent of hemispherical inner core from PKP(DF) and PKP(Cdiff) for equatorial paths2012

    • Author(s)
      Tanaka, S
    • Journal Title

      Phys. Earth Planet. Inter

      Volume: 210-211 Pages: 50-62

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Depth extent of hemispherical inner core from PKP(DF) and PKP(Cdiff) for equatorial paths2012

    • Author(s)
      Tanaka, S.
    • Journal Title

      Phys. Earth Planet. Inter.

      Volume: 210-211 Pages: 50-62

    • DOI

      10.1016/j.pepi.2012.08.001

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Presentation] A new probe of the inner core boundary2012

    • Author(s)
      Tanaka, S. and Tkalcic, H
    • Organizer
      Frequency dependent amplitude ratio of PKiKP/PcP observed at the Hinet array(招待), AGU2012
    • Place of Presentation
      サンフランシスコ, USA
    • Year and Date
      2012-12-03
    • Related Report
      2012 Final Research Report
  • [Presentation] Hinetで観測されたPKiKP/PcP振幅比の周波数依存性2012

    • Author(s)
      Tanaka, S. and Tkalcic, H
    • Organizer
      地震学会 2012年秋季大会
    • Place of Presentation
      函館
    • Year and Date
      2012-10-18
    • Related Report
      2012 Final Research Report
  • [Presentation] Influence of thermal boundary condition and anisotropic diffusivity on dynamics in the Earth's core, SEDI20122012

    • Author(s)
      Matsushima, M
    • Organizer
      SEDI2012
    • Place of Presentation
      リーズ, イギリス
    • Year and Date
      2012-07-03
    • Related Report
      2012 Final Research Report
  • [Presentation] Frequency dependent amplitude ratio of PKiKP/PcP observed at the Hinet array2012

    • Author(s)
      Tanaka, S. and Tkalcic, H
    • Organizer
      Possible detection of a thin liquid layer above the inner core boundary, SEDI2012
    • Place of Presentation
      リーズ, イギリス
    • Year and Date
      2012-07-02
    • Related Report
      2012 Final Research Report
  • [Presentation] Effects of thermal boundary condition and anisotropic thermal diffusivity in the Earth's core2012

    • Author(s)
      Matsushima, M
    • Organizer
      日本地球惑星科学連合2012年大会
    • Place of Presentation
      千葉
    • Year and Date
      2012-05-25
    • Related Report
      2012 Final Research Report
  • [Presentation] Latitudinal dependence of some effects of anisotropic thermal diffusivity in the Earth's core2011

    • Author(s)
      Matsushima, M
    • Organizer
      IUGG2011
    • Place of Presentation
      メルボルン, オーストラリア
    • Year and Date
      2011-07-02
    • Related Report
      2012 Final Research Report
  • [Presentation] Depth variation of inner core hemisphericity from PKP(DF) and PKP(Cdiff)2011

    • Author(s)
      Tanaka, S
    • Organizer
      P-wave velocity and attenuation structures for equatorial paths, IUGG2011
    • Place of Presentation
      メルボルン, オーストラリア
    • Year and Date
      2011-07-02
    • Related Report
      2012 Final Research Report
  • [Presentation] Depth variation of inner core hemisphericity from PKP (DF) and PKP (Cdiff) : P-wave velocity and attenuation structures for equatorial paths2011

    • Author(s)
      S.Tanaka
    • Organizer
      IUGG2011
    • Place of Presentation
      オーストラリア,メルボルン
    • Year and Date
      2011-07-02
    • Related Report
      2011 Annual Research Report
  • [Presentation] Latitudinal dependence of some effects of anisotropic thermal diffusivity in the Earth's core2011

    • Author(s)
      M.Matsushima
    • Organizer
      IUGG2011
    • Place of Presentation
      オーストラリア,メルボルン
    • Year and Date
      2011-07-02
    • Related Report
      2011 Annual Research Report
  • [Presentation] The effect of anisotropic diffusivity on rotating magnetoconvection in the Earth's core2010

    • Author(s)
      Matsushima, M
    • Organizer
      SEDI 2010
    • Place of Presentation
      カリフォルニア大学サンタバーバラ校, USA.
    • Year and Date
      2010-07-23
    • Related Report
      2012 Final Research Report
  • [Presentation] The effect of anisotropic diffusivity on rotating magnetoconvection in the Earth's core2010

    • Author(s)
      M.Matsushima
    • Organizer
      SEDI 2010
    • Place of Presentation
      カリフォルニア大学サンタバーバラ校
    • Year and Date
      2010-07-23
    • Related Report
      2010 Annual Research Report
  • [Presentation] Spatial variations of differential travel times and amplitude ratios between PKP-Cdiff and PKP-DF2010

    • Author(s)
      Tanaka, S
    • Organizer
      SEDI 2010
    • Place of Presentation
      カリフォルニア大学サンタバーバラ校, USA
    • Year and Date
      2010-07-19
    • Related Report
      2012 Final Research Report
  • [Presentation] Spatial variations of differential travel times and amplitude ratios between PKP-Cdiff and PKP-DF2010

    • Author(s)
      S.Tanaka
    • Organizer
      SEDI 2010
    • Place of Presentation
      カリフォルニア大学サンタバーバラ校
    • Year and Date
      2010-07-19
    • Related Report
      2010 Annual Research Report
  • [Presentation] Array analysis of PKP(BC) phase with station corrections for travel times and amplitudes2009

    • Author(s)
      Tanaka, S
    • Organizer
      AGU Fall Meeting 2009
    • Place of Presentation
      モスコーンセンター,サンフランシスコ,USA
    • Year and Date
      2009-12-16
    • Related Report
      2012 Final Research Report
  • [Presentation] Array analysis of PKP(BC)phase with station corrections for travel times and amplitudes2009

    • Author(s)
      S.Tanaka
    • Organizer
      AGU Fall Meeting 2009
    • Place of Presentation
      モスコーンセンター, サンフランシスコ, USA
    • Year and Date
      2009-12-16
    • Related Report
      2009 Annual Research Report
  • [Presentation] Global and local MHD turbulence in the Earth's core2009

    • Author(s)
      Matsushima, M
    • Organizer
      AGU Fall Meeting 2009
    • Place of Presentation
      モスコーンセンター,サンフランシスコ,USA
    • Year and Date
      2009-12-15
    • Related Report
      2012 Final Research Report
  • [Presentation] Global and local MHD turbulence in the Earth's core2009

    • Author(s)
      M.Matsushima
    • Organizer
      AGU Fall Meeting 2009
    • Place of Presentation
      モスコーンセンター, サンフランシスコ, USA
    • Year and Date
      2009-12-15
    • Related Report
      2009 Annual Research Report
  • [Presentation] Effects of anisotropic tensor diffusivity on the core dynamics2009

    • Author(s)
      Matsushima, M
    • Organizer
      第126回地球電磁気・地球惑星圏学会
    • Place of Presentation
      金沢大学,金沢
    • Year and Date
      2009-09-28
    • Related Report
      2012 Final Research Report
  • [Presentation] Effects of anisotropic tensor diffusivity on the core dynamics2009

    • Author(s)
      M.Matsushima
    • Organizer
      第126回地球電磁気・地球惑星圏学会
    • Place of Presentation
      金沢大学, 金沢市
    • Year and Date
      2009-09-28
    • Related Report
      2009 Annual Research Report
  • [Presentation] Frequency dependent amplitude ratio of PKiKP/PcP observed at the Hinet array: Possible detection of a thin liquid layer above the inner core boundary

    • Author(s)
      Tanaka, S. and Tkalcic, H.
    • Organizer
      SEDI2012
    • Place of Presentation
      リーズ、イギリス
    • Related Report
      2012 Annual Research Report
  • [Presentation] Hinetで観測されたPKiKP/PcP振幅比の周波数依存性

    • Author(s)
      Tanaka, S. and Tkalcic, H.
    • Organizer
      日本地震学会 2012年 秋季大会
    • Place of Presentation
      函館
    • Related Report
      2012 Annual Research Report
  • [Presentation] A new probe of the inner core boundary: Frequency dependent amplitude ratio of PKiKP/PcP observed at the Hinet array

    • Author(s)
      Tanaka, S. and Tkalcic, H.
    • Organizer
      AGU2012 Fall Meeting
    • Place of Presentation
      サンフランシスコ、アメリカ
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Effects of thermal boundary condition and anisotropic thermal diffusivity in the Earth’s core

    • Author(s)
      Matsushima, M.
    • Organizer
      日本地球惑星科学連合2012年大会
    • Place of Presentation
      幕張
    • Related Report
      2012 Annual Research Report
  • [Presentation] Influence of thermal boundary condition and anisotropic diffusivity on dynamics in the Earth’s core

    • Author(s)
      Matsushima, M.
    • Organizer
      SEDI2012
    • Place of Presentation
      リーズ、イギリス
    • Related Report
      2012 Annual Research Report
  • [Book] 地球電磁気・地球惑星圏学会編, 太陽地球系科学(第12章 地球ダイナモ)2010

    • Author(s)
      松島政貴
    • Publisher
      京都大学学術出版会
    • Related Report
      2012 Final Research Report
  • [Book] 太陽地球系科学(第12章地球ダイナモ)2010

    • Author(s)
      地球電磁気・地球惑星圏学会編松島政貴(分担)
    • Publisher
      京都大学学術出版会
    • Related Report
      2010 Annual Research Report
  • [Remarks] 田中 聡

    • URL

      http://www.jamstec.go.jp/res/ress/stan/TanakaHome/Welcome.html

    • Related Report
      2012 Final Research Report

URL: 

Published: 2009-04-01   Modified: 2019-07-29  

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