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SEISMOLOGICAL ANALYSIS AND NUMERICAL SIMULATION FOR THE MANTLE STRUCTURE WITH SUBDUCTED SLAB

Research Project

Project/Area Number 16340130
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Solid earth and planetary physics
Research InstitutionHiroshima University

Principal Investigator

TAJIMA Fumiko  Hiroshimo University, Graduate School of Science, Professor, 大学院理学研究科, 教授 (50346475)

Co-Investigator(Kenkyū-buntansha) YOSHIOKA Shoichi  Kyushu University, Graduate School of Science, Associate Professor, 大学院理学研究院, 助教授 (20222391)
NAKAKUKI Tomoeki  Graduate School of Science, Research Associate, 大学院理学研究科, 助手 (10263667)
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥9,100,000 (Direct Cost: ¥9,100,000)
Fiscal Year 2006: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2005: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2004: ¥4,900,000 (Direct Cost: ¥4,900,000)
KeywordsStagnant slab / Broadband waveform analysis / Numerical simulation / Slab dynamics
Research Abstract

Broadband seismic waveform analyses were carried out to study the structure associated with stagnant slab (SS) in the northwestern Pacific. The region of model M3.11 with high velocity anomaly (HVA) and the 660 km discontinuity depth depression is bounded by zones that are delineated by model M2.0 with HVA but without depression of the discontinuity. The structural change is associated with the geochemical properties of SS where the contrast of a hydrous garnet rich layer versus a bulk of peridotite involves. Anomalously broadened P waveforms of deep focus events were observed at some regional stations after sampling the region with SS. The rays of the anomalous waves propagated in the vicinity of the regions which are modeled with M3.11 or M2.0. The broadened P waveforms may be SV converted waves within an anomalous narrow zone near the "660 km" discontinuity. The creation of such heterogeneities may involve in the complex structure of phase transformation with water and cold temperature anomaly with SS. Numerical simulations were also performed to test various physical conditions associated with SS. To explain formation process of SS, effects of adiabatic compression, viscous dissipation, and trench retreat were incorporated into a 2-D thermal-fluid flow numerical model to clarify the roles of various factors on formation process of SS. We also developed a 2-D numerical model incorporating spatio-temporal variations of physical properties such as density and viscosity, and a method of calculation for temperature distribution of subducting slab with arbitrary shape. Using the model, we tested conditions to cause depression of the 660 km discontinuity, by calculating temperature distribution along a profile across the Japanese islands where seismic velocity structure has been well determined using receiver functions and seismic tomography.

Report

(4 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (13 results)

All 2007 2006 2005

All Journal Article (13 results)

  • [Journal Article] The role of history-dependent rheology in plate boundary lubrication for generating one-sided subduction2007

    • Author(s)
      M.Tagawa
    • Journal Title

      Pure and Applied Geophysics 164

      Pages: 1-29

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Dynamical modeling of trench retreat driven by the slab interaction with the mantle transition zone2007

    • Author(s)
      M.Tagawa
    • Journal Title

      Earth, Planets and Space 59

      Pages: 65-74

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Dynamical modeling of trench retreat driven by the slab interaction with the mantle transition zone2007

    • Author(s)
      Tagawa M., T.Nakakuki, F.Tajima
    • Journal Title

      Earth Planet. Space 59

      Pages: 65-74

    • NAID

      10024496411

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] The role of history-dependent rheology in plate boundary lubrication for generating one-sided subduction2007

    • Author(s)
      Tagawa M., T.Nakakuki, M.Kameyama, F.Tajima
    • Journal Title

      Pure Appl. Geophys. 164

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] The role of history-dependent rheology in plate boundary lubrication for generating one-sided subduction2007

    • Author(s)
      Tagawa, M
    • Journal Title

      Pure and Applied Geophysics 164

      Pages: 1-29

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Dynamical modeling of trench retreat driven by the slab interaction with the mantle transition zone2007

    • Author(s)
      Tagawa, M
    • Journal Title

      Earth,Planets and Space 59

      Pages: 65-74

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Implications of seismic waveforms : complex physical properties associated with stagnant slab2006

    • Author(s)
      F.Tajima
    • Journal Title

      Geophysical Research Letters 33

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Implications of seismic waveforms : complex physical properties associated with stagnant slab2006

    • Author(s)
      Tajima F., T.Nakagawa
    • Journal Title

      Geophys. Res. Lett., 2006 33

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Implications of seismic waveforms : complex physical properties associated with stagnant slab2006

    • Author(s)
      F.Tajima, T.Nakagawa
    • Journal Title

      Geophysical Research Letters 33

    • Related Report
      2005 Annual Research Report
  • [Journal Article] スタグナントスラブに伴うマントル構造の地震学的解析と数値シミュレーション2005

    • Author(s)
      田島文子
    • Journal Title

      地震 58

      Pages: 121-141

    • NAID

      130006787571

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Seismological analysis and numerical simulations for mantle structure associated with stagnant slab2005

    • Author(s)
      Tajima F., T.Nakakuki, S.Yoshioka
    • Journal Title

      Zisin 58

    • NAID

      130006787571

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Seismic broadband waveform analysis : study of fine structure associated with stagnant slab2005

    • Author(s)
      Tajima F.
    • Journal Title

      News Letter on Stagnant Slab : A New Keyword for Mantle Dynamics no.2

      Pages: 35-35

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] スタグナントスラブに伴うマントル構造の地震学的解析と数値シミュレーション2005

    • Author(s)
      田島文子, 中久喜伴益, 吉岡祥一
    • Journal Title

      地震 58

      Pages: 121-141

    • NAID

      130006787571

    • Related Report
      2005 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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