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Seismic and geo-electromagnetic observations of core and mantle

Planned

Project AreaInteraction and Coevolution of the Core and Mantle: Toward Integrated Deep Earth Science
Project/Area Number 15H05832
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

田中 聡  国立研究開発法人海洋研究開発機構, 海域地震火山部門(火山・地球内部研究センター), センター長代理 (60281961)

Co-Investigator(Kenkyū-buntansha) 川勝 均  東京大学, 地震研究所, 教授 (60242153)
ヘルフリック ジョージ  東京工業大学, 地球生命研究所, 特任教授 (80747163)
金嶋 聰  九州大学, 理学研究院, 教授 (80202018)
大滝 壽樹  国立研究開発法人産業技術総合研究所, 地質調査総合センター, 主任研究員 (00356643)
清水 久芳  東京大学, 地震研究所, 准教授 (70302619)
竹内 希  東京大学, 地震研究所, 准教授 (90313048)
河合 研志  東京大学, 大学院理学系研究科(理学部), 准教授 (20432007)
ハウザー クリスティーン  東京工業大学, 地球生命研究所, 特任助教 (20723737)
山本 裕二  高知大学, 教育研究部総合科学系複合領域科学部門, 教授 (00452699)
松島 政貴  東京工業大学, 理学院, 助教 (20242266)
Project Period (FY) 2015-06-29 – 2020-03-31
Project Status Granted (Fiscal Year 2019)
Budget Amount *help
¥178,750,000 (Direct Cost: ¥137,500,000、Indirect Cost: ¥41,250,000)
Fiscal Year 2019: ¥15,860,000 (Direct Cost: ¥12,200,000、Indirect Cost: ¥3,660,000)
Fiscal Year 2018: ¥35,360,000 (Direct Cost: ¥27,200,000、Indirect Cost: ¥8,160,000)
Fiscal Year 2017: ¥33,410,000 (Direct Cost: ¥25,700,000、Indirect Cost: ¥7,710,000)
Fiscal Year 2016: ¥45,760,000 (Direct Cost: ¥35,200,000、Indirect Cost: ¥10,560,000)
Fiscal Year 2015: ¥48,360,000 (Direct Cost: ¥37,200,000、Indirect Cost: ¥11,160,000)
Keywords核ーマントル / 地震波 / 地球電磁気 / 古地磁気 / 地震 / CMB / 外核最上部 / 外核最下部 / ICB / 内核 / マントル / 核-マントル境界 / 外核
Outline of Annual Research Achievements

今年度の研究成果は以下の通りである。いずれも論文として公表された。1. 有限歪モデルに基づく熱膨張率の圧力依存性を検討した結果、地球核の圧力条件下における金属では、従来の見積より約2.5倍大きくなることがわかった。(Helffrich) 2. 新たに開発した地震波減衰推定手法を用い、海底地震観測で得られたデータに適用した結果、海洋リソスフェアと海洋アセノスフェアにおける減衰構造の周波数依存性に明確な違いがあることを明らかにした。(竹内)3. 中央アメリカ直下のマントル最下部D”領域の3次元S波速度構造を推定し、沈み込んだフェラロン・プレートの行方を明らかにした。このような冷たいプレートが核の表面に達することによって、外核の対流運動に影響を与える可能性を指摘した。(河合)4. 2種類のコア・フェーズの走時差を用いて、アラスカ直下マントル最下部に3%程度のP波速度構造不均質が存在することを明らかにした。これにより内核異方性の見積に大きな影響を与えてきたコア・フェーズの観測データが、マントル構造の不均質によって強いバイアスを受けていることがわかった。(川勝、竹内)5. 世界中の群列地震観測データを外核最上部の地震波速度構造を再検討した。外核最上部のP波速度は標準モデルより最大で0.03km/s遅く、低速度層の厚さは従来の値(400km)より厚い450kmと求められた。(金嶋)6. トンガ・フィジー島直下の下部マントル中央部に地震波散乱体を見出した。興味深いことに、その散乱体は太平洋大規模S波低速度領域が盛り上がりの上部に集中している。(金嶋)7. 理論的考察より、下部マントル中央部の地震波散乱体は、初期地球に核から離溶した二酸化ケイ素である可能性を見出した。(Helffrich)

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

順調に研究成果が得られている。特に、中米直下のマントル最下部まで沈み込んだプレートによって核表面が冷却される、核から放出された二酸化ケイ素がマントルの上昇流に運ばれて地震波散乱体を形成する、などの仮説の提唱が特筆される。タイにおける地震観測については、半年に一度、計2回データ回収を行い、約1年分の地震データを収集した。代表的な地震波形を用いてマントル最下部の構造に関する解析を行い、太平洋大規模S波低速度領域の西端にあるニューギニア島直下のマントル底部に地震波速度低下率が数%以上にも及ぶ領域の存在を検出した。オーストラリア、インド、中国から地震波データの提供を受け、マントル最下部の構造について解析を実施した。これらの国による地震データは、タイの観測網によって調査できる範囲を大いに拡大できることがわかった。地震波形インバージョン法の改良を進める中で、3次元地震波速度構造における震源過程の影響を評価した。外核最下部の地震波速度構造に関しては、オースラリア直下を重点的に解析し、論文を準備した。下部マントルの電気伝導度解析において、局所地磁気ジャークの予備的解析を行い、電気伝導度の地域性を見出した。今後、さらにデータを増やしてその存在を検証する。A04理論計算班や東京工業大学地球生命研究所と共同で、地殻から核の構造とダイナミクスに関する国際ワークショップを開催した。A02地球化学班と合同研究集会を開いて情報交換を行い、核とマントルの共進化についての議論を深めた。

Strategy for Future Research Activity

中間評価の指摘に対応するため、古地磁気学と磁場解析の研究者を研究分担者に招き、データ解析を推進するためのポスドクを補充するなど、研究体制を強化する。タイにおける地震観測に関しては、30年度の夏季にデータ回収を一回行い、30年度末までに観測網を撤収して観測を終了する。その後データ集約と最終的なデータの品質確認を行い、研究分担者の地震データ解析担当に提供する。タイにおける地震観測の終了後、最終年度である31年度に今後の展開を議論するためにタイで国際ワークショップを開催することを検討しており、そのための打ち合わせを行う。タイだけでなく、オーストラリア、中国、台湾、アメリカ、他多くの国との国際共同研究を推進する。
既存、新規のデータを用いて、以下のような地震学的・地球電磁気学的解析テーマに取り組む。1. 西太平洋のマントル最下部の地震波速度構造(不均質・異方性)の解明。2. マントル内のVp/Vs比の地域性の解明。3. 全マントル減衰構造。4. 中央アメリカ直下のマントル遷移層の地震学的構造。5. 内核・外核の構造解析。6. 地磁気ジャークによる下部マントルの電気伝導度構造。7. 古地磁気記録による低頻度逆転期の古地磁気変動。8. 地磁気データによる外核の流れ場の推定。
他の班との連携を深めるために高圧実験、地球化学、理論計算など他の班と合同研究集会を開く。異なる班どうしで意見・情報交換を促進して、核―マントルの相互作用と共進化について解明を進める。

Report

(3 results)
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • 2015 Annual Research Report

Research Products

(111 results)

All 2018 2017 2016 2015 Other

All Int'l Joint Research Journal Article Presentation Book Remarks

  • [Int'l Joint Research] マヒドン大学理学部(タイ王国)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] インド国立地球物理研究所(インド)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] オーストラリア国立大学(オーストラリア)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] 中国科学院(中華人民共和国)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] 台湾中央研究院(中華民国)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research]

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] マヒドン大学理学部(タイ王国)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] インド国立地球物理研究所(インド)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] オースラリア国立大学地球科学研究所(オーストラリア)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] 中国科学院(中華人民共和国)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] 台湾中央研究院(中華民国)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research]

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] マヒドン大学理学部(タイ王国)

    • Related Report
      2015 Annual Research Report
  • [Int'l Joint Research] ユタ大学(アメリカ合衆国)

    • Related Report
      2015 Annual Research Report
  • [Int'l Joint Research] オーストラリア国立大学(オーストラリア)

    • Related Report
      2015 Annual Research Report
  • [Journal Article] A new fifth parameter for transverse isotropy III: reflection and transmission coefficients2018

    • Author(s)
      Long Xin、Kawakatsu Hitoshi、Takeuchi Nozomu
    • Journal Title

      Geophysical Journal International

      Volume: 45 Pages: 176-184

    • DOI

      10.1002/2017gl075685

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Array analyses of SmKS waves and the stratification of the Earth’s outermost core2018

    • Author(s)
      Satoshi Kaneshima
    • Journal Title

      Physics of the Earth and Planetary Interiors

      Volume: 印刷中 Pages: 234-246

    • DOI

      10.1016/j.pepi.2017.03.006

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Seismic scatterers in the mid-lower mantle beneath Tonga-Fiji2018

    • Author(s)
      Kaneshima Satoshi
    • Journal Title

      Physics of the Earth and Planetary Interiors

      Volume: 274 Pages: 1-13

    • DOI

      10.1016/j.pepi.2017.09.007

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Core-Exsolved SiO2 Dispersal in the Earth's Mantle2018

    • Author(s)
      Helffrich, G., Ballmer, M., Hirose, K.
    • Journal Title

      Journal of Geophysical Research, Solid Earth

      Volume: 123 Pages: 176-188

    • DOI

      10.1002/2017jb014865

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Isotopic signature of core-derived SiO22018

    • Author(s)
      Helffrich, G., Shahar, A., Hirose K.
    • Journal Title

      American Mineralogist

      Volume: -

    • DOI

      10.2138/am-2018-6482ccbyncnd

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] High-pressure phase transitions of lunar highland anorthosite in the deep Earth’s mantle2018

    • Author(s)
      Nishi M., Greaux S., Tateno S., Kuwayama Y., Kawai K., Irifune T., Maruyama S.
    • Journal Title

      Geoscience Frontiers

      Volume: in press Pages: 1-13

    • DOI

      10.1016/j.gsf.2017.10.002

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] High-pressure phase relation of KREEP basalts: A clue for finding the lost Hadean crust?2018

    • Author(s)
      Greaux S., Nishi M., Tateno S., Kuwayama Y., Hirao N,, Kawai K., Maruyama S., Irifune T.
    • Journal Title

      Physics of the Earth and Planetary Interiors

      Volume: 274 Pages: 184-194

    • DOI

      10.1016/j.pepi.2017.12.004

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A finite strain approach to thermal expansivity’s pressure dependence2017

    • Author(s)
      Helffrich George
    • Journal Title

      American Mineralogist

      Volume: 102 Pages: 1690-1695

    • DOI

      10.2138/am-2017-6007

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Determination of intrinsic attenuation in the oceanic lithosphere-asthenosphere system2017

    • Author(s)
      Takeuchi Nozomu、Kawakatsu Hitoshi、Shiobara Hajime、Isse Takehi、Sugioka Hiroko、Ito Aki、Utada Hisashi
    • Journal Title

      Science

      Volume: 358 Pages: 1593-1596

    • DOI

      10.1126/science.aao3508

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Imaging paleoslabs in the D″ layer beneath Central America and the Caribbean using seismic waveform inversion2017

    • Author(s)
      Borgeaud Anselme F. E.、Kawai Kenji、Konishi Kensuke、Geller Robert J.
    • Journal Title

      Science Advances

      Volume: 3 Pages: 1602700-1602700

    • DOI

      10.1126/sciadv.1602700

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Persistence of strong silica-enriched domains in the Earth’s lower mantle2017

    • Author(s)
      M.D. Ballmer, C. Houser, J. Hernlund, R. Wentzcovitch, and K. Hirose
    • Journal Title

      Nature Geoscience

      Volume: 10 Pages: 236-240

    • DOI

      10.1038/ngeo2898

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] SiO2 crystallization and compositional evolution of the Earth's core2017

    • Author(s)
      K. Hirose, G. Morard, R. Sinmyo, K. Umemoto, J. Hernlund, G. Helffrich, and S. Labrosse
    • Journal Title

      Nature

      Volume: 543 Pages: 99-102

    • DOI

      10.1038/nature21367

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Differential Monte Carlo method for computing seismogram envelopes and their partial derivatives2016

    • Author(s)
      Takeuchi, N.
    • Journal Title

      Journal of Geophysical Research, Solid Earth

      Volume: 121 Pages: 2428-3444

    • DOI

      10.1002/2015jb012661

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Global seismic data reveal little water in the mantle transition zone2016

    • Author(s)
      Houser C.
    • Journal Title

      Earth and Planetary Science Letters

      Volume: 448 Pages: 94-101

    • DOI

      10.1016/j.epsl.2016.04.018

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Finite frequency effects on apparentS-wave splitting in the D″ layer: comparison between ray theory and full-wave synthetics2016

    • Author(s)
      Borgeaud, A.F.E., K. Konishi, K. Kawai, R.J. Geller
    • Journal Title

      Geophysical Journal International

      Volume: 207 Pages: 12-28

    • DOI

      10.1093/gji/ggw254

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Waveform inversion for 3-D S-velocity structure of D" beneath the Northern Pacific: possible evidence for a remnant slab and a passive plume2016

    • Author(s)
      Suzuki, Y., K. Kawai, K. Konishi, A.F.E. Borgeaud, R.J. Geller
    • Journal Title

      Earth, Planets and Space

      Volume: 68 Pages: 198-198

    • DOI

      10.1186/s40623-016-0576-0

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] A new fifth parameter for transverse isotropy II: partial derivatives2016

    • Author(s)
      Kawakatsu, H.
    • Journal Title

      Geophysical Journal International

      Volume: 206 Pages: 360-367

    • DOI

      10.1093/gji/ggw152

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] On the latitude dependence of drift velocity of the geomagnetic main field and its secular variation2016

    • Author(s)
      Yukutake Takesi、Shimizu Hisayoshi
    • Journal Title

      Physics of the Earth and Planetary Interiors

      Volume: 257 Pages: 28-39

    • DOI

      10.1016/j.pepi.2016.05.002

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Drifting and standing fields in the geomagnetic field for the past 400 years2015

    • Author(s)
      Yukutake, T. and H. Shimizu
    • Journal Title

      Physics of Earth and Planetary Interior

      Volume: 248 Pages: 63-72

    • DOI

      10.1016/j.pepi.2015.08.003

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Complex inner core boundary from frequency characteristics of the reflection coefficients of PKiKP waves observed by Hi-net2015

    • Author(s)
      S. Tanaka and H. Tkalcic
    • Journal Title

      Progress in Earth and Planetary Science

      Volume: 2 Pages: 1-16

    • DOI

      10.1186/s40645-015-0064-3

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Independent estimate of velocity structure of Earth's lowermost outer core beneath the northeast Pacific from PKiKP-PKPbc differential traveltime and dispersion in PKPbc2015

    • Author(s)
      T. Ohtaki & S. Kaneshima
    • Journal Title

      Journal of Geophysical Research Solid Earth

      Volume: 120 Pages: 1-15

    • DOI

      10.1002/2015jb012140

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Correction of ScS-S travel times for 3D mantle structure to reveal shear wave azimuthal anisotropy in the lower mantle2017

    • Author(s)
      Tanaka S.
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Comparison of frequency dependent reflection coefficients at the inner core boundary beneath the central America and western Pacific2017

    • Author(s)
      Tanaka, S. and H. Tkalcic
    • Organizer
      国際測地学協会及び国際地震学・地球内部物理学協会2017年合同学術総会
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Anomalies of S-waves passing through the D'' region beneath New Guinea observed by Thai Seismic Array (TSAR)2017

    • Author(s)
      Tanaka, S., W. Siripunvaraporn, S. Boonchaisuk, S. Noisagool, K. Kawai, Y. Suzuki, Y. Ishihara, T. Kim, K. Miyakawa, N. Takeuchi, H. Kawakatsu
    • Organizer
      日本地震学会2017年度秋季大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Thai Seismic Array (TSAR) Project: Progress in FY20162017

    • Author(s)
      Tanaka, S., W. Siripunvarporn, S. Boonchaisuk, S. Noisagool,K. Kawai, T. Kim, Y. Suzuki, Y. Ishihara, K. Miyakawa, N. Takeuchi, H. Kawakatsu
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Seismic attenuation of multiple ScS phases beneath South China Sea2017

    • Author(s)
      Nguyen, L.M., S. Tanaka, Y. Ishihara, T. H. Nguyen, V. L. Ha, T. G. Ha, D. Suetsugu
    • Organizer
      国際測地学協会及び国際地震学・地球内部物理学協会2017年合同学術総会
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Structure of Crust and Upper Mantle beneath South China Sea revealed by Surface Wave Tomography2017

    • Author(s)
      Ha, T.G., T. H. Nguyen, S. Tanaka, L. M. Nguyen, Y. Ishihara, V. L. Ha, Q. K. Le
    • Organizer
      国際測地学協会及び国際地震学・地球内部物理学協会2017年合同学術総会
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Seismological evidence for heterogeneous lowermost outer core of the Earth2017

    • Author(s)
      Ohtaki, T., S. Kaneshima, H. Ichikawa, T. Tsuchiya
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Seismological evidence for heterogeneous lowermost outer core of the Earth2017

    • Author(s)
      Ohtaki, T., S. Kaneshima, H. Ichikawa, T. Tsuchiya
    • Organizer
      国際測地学協会及び国際地震学・地球内部物理学協会2017年合同学術総会
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Examination of local geomagnetic jerks using wavelet analysis2017

    • Author(s)
      Shimizu, H., H. Utada
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Intrinsic Attenuations in the Oceanic Lithosphere and Asthenosphere Constrained by Seismogram Envelopes2017

    • Author(s)
      Takeuchi, N., NOMan Project Team
    • Organizer
      国際測地学協会及び国際地震学・地球内部物理学協会2017年合同学術総会
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Intrinsic Attenuations in the Oceanic Lithosphere and Asthenosphere Constrained by Seismogram Envelopes2017

    • Author(s)
      Takeuchi, N., NOMan Project Team
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Lithology Distribution Model for Neutrino Flux Simulations Obtained by Using Bayesian Inference2017

    • Author(s)
      Takeuchi, N., KamLAND Simulator Project Team
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ab initio calculations reveal why thermal and compositional variations are required to explain observed mantle shear and compressional velocity anomalies2017

    • Author(s)
      Houser, C., J. Hernlund, J. Valencia-Cardona, R. Wentzcovitch
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Slow velocities and thin transition zone indicate upwelling lower mantle beneath eastern Eurasia2017

    • Author(s)
      Houser, C., A. Webb
    • Organizer
      国際測地学協会及び国際地震学・地球内部物理学協会2017年合同学術総会
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] New developments in Earth’s deep water cycle2017

    • Author(s)
      Houser, C.
    • Organizer
      RESCEU Symposium Planet Formation around Snowline
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The failure of 1D seismic model fitting to constrain lower mantle composition2017

    • Author(s)
      Houser, C., J. Hernlund, J. Valencia-Cardona, R. Wentzcovitch
    • Organizer
      アメリカ地球物理学連合2017年秋季大会
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Thai Seismic Array (TSAR) and overview of the contribution of JAMSTEC to seismological observations in Southeastern Asia2017

    • Author(s)
      Tanaka, S., W. Siripunvaraporn, Y. Ishihara
    • Organizer
      Myanmar Applied Earth Sciences Association 2017 Meeting
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] High-P, T elasticity of iron-light element alloys2017

    • Author(s)
      Tsuchiya, T., Y. Kuwayama, M. Ishii, K. Kawai
    • Organizer
      アメリカ地球物理学連合2017年秋季大会
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 3-D S-velocity structure in the lowermost mantle beneath the Northern Pacific2017

    • Author(s)
      Suzuki, Y., K. Kawai, R. J. Geller, A. F. E. Borgeaud, K. Konishi
    • Organizer
      アメリカ地球物理学連合2017年秋季大会
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 再決定した深発地震の震源パラメータを用い波形インバージョンで推定した中米下D” 領域の3次元構造2017

    • Author(s)
      Yamaya, L., A. F. E. Borgeaud, K. Kawai, R. J. Geller, K. Konishi
    • Organizer
      日本地震学会2017年度秋季大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 地震波形水平2成分を用いた北部太平洋下D”領域 の3次元S波速度構造推定2017

    • Author(s)
      Suzuki, Y., K. Kawai, R. J. Geller, K. Konishi
    • Organizer
      日本地震学会2017年度秋季大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Velocity structure of the transition zone beneath Central and North America and the Caribbean from waveform inversion2017

    • Author(s)
      Borgeaud, A. F. E., K. Kawai, R. J. Geller
    • Organizer
      日本地震学会2017年度秋季大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] High-P, T Elasticity of Iron-Light Element Alloys2017

    • Author(s)
      Tsuchiya, T., Y. Kuwayama, M. Ishii, K. Kawai
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Waveform inversion for whole mantle 1-D S-velocity and Q structure beneath Central America and the Caribbean2017

    • Author(s)
      Borgeaud, A. F. E., K. Kawai, R. J. Geller, K. Konishi
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effects of initial whole mantle 1-D S-velocity and Q structure on waveform inversion for 3-D S-velocity structure: Application to D” beneath Central America and the Caribbean2017

    • Author(s)
      Borgeaud, A. F. E., K. Kawai, R. J. Geller, K. Konishi
    • Organizer
      ヨーロッパ地球物理学連合2017年大会
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Velocity structure model dependence of upper, middle and lower crust volume2016

    • Author(s)
      Takeuchi, N.
    • Organizer
      2nd Workshop on KamLAND Geoscience: Toward Enhanced Reference Earth Models for Geoneutrino Analysis
    • Place of Presentation
      東京大学(東京都文京区)
    • Year and Date
      2016-03-23
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Waveform inversion for shear wave velocity structure in the lowermost mantle2016

    • Author(s)
      Kawai, K.,
    • Organizer
      MISASA VI Misasa International Symposium 2016
    • Place of Presentation
      ブランナールみささ(鳥取県東伯郡)
    • Year and Date
      2016-03-09
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Seismological Constraints on Velocity and Density in the Earth’s Core2016

    • Author(s)
      Takeuchi, N.
    • Organizer
      1st Neutrino Oscillation Tomography Workshop
    • Place of Presentation
      東京大学(東京都文京区)
    • Year and Date
      2016-01-07
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Thai Seismic Array (TSAR) Project2016

    • Author(s)
      Tanaka, S., W. Siripunvarporn, Y. Ishihara, S. Boonchaisuk, S. Noisagool, K. Kawai, T. Kim, K. Miyakawa, K., N. Takeuchi, H. Kawakatsu
    • Organizer
      日本地球惑星科学連合2016年大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] ScS-S走時差の補正について2016

    • Author(s)
      田中聡
    • Organizer
      日本地震学会2016秋季大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] Current Status of Pilot stations of Thai Seismic Array (TSAR) and Preliminary Receiver Function Analysis2016

    • Author(s)
      Noisagool, S., S. Tanaka, H. Kawakatsu, W. Siripunvaraporn, S. Boonchaisuk, Y. Ishihara, T. Kim, K. Kawai, N. Takeuchi, K. Miyakawa
    • Organizer
      日本地震学会2016秋季大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] Thai Seismic ARray (TSAR) project and it's future application for tectonic and crustal studies of Thailand2016

    • Author(s)
      Noisagool S., S. Tanaka, H. Kawakatsu, W. Siripunvaraporn, S. Boonchisuk
    • Organizer
      The 3rd conference on Tectonic of Northwestern Indochina
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Comparison of frequency dependent amplitude ratios of PKiKP/PcP observed by Hi-net and_USArray2016

    • Author(s)
      Tanaka, S.
    • Organizer
      Goldschmidt 2016
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] P-wave reflection coefficients at the inner core boundary beneath the central America observed by USArray2016

    • Author(s)
      Tanaka, S., H. Tkalcic
    • Organizer
      第15回地球深部研究国際シンポジウム
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Problems with 1D seismic model fitting2016

    • Author(s)
      Houser, C., J.W. Hernlund, R.M. Wentzcovitch
    • Organizer
      日本地球惑星科学連合2016年大会
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A 3D Temperature Map of the Lower Mantle2016

    • Author(s)
      Houser, C., R.M. Wentzcovitch
    • Organizer
      Goldschmidt 2016
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Bridgmanite Enriched Ancient Mantle Structures (BEAMS): A model to unify lower mantle geophysics, geochemistry, and geodynamics2016

    • Author(s)
      Houser, C., M.D. Ballmer, J.W. Hernlund
    • Organizer
      Workshop on the Origin of Plate Tectonics 2016
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Bridgmanite Enriched Ancient Mantle Structures (BEAMS): A model to unify lower mantle geophysics, geochemistry, and geodynamics2016

    • Author(s)
      Houser, C., M.D. Ballmer, J.W. Hernlund
    • Organizer
      第15回地球深部研究国際シンポジウム
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 地震波形水平2成分を用いた北部太平洋D”領域の3次元S波構造推定2016

    • Author(s)
      鈴木裕輝、河合研志、R. Geller、小西健介
    • Organizer
      日本地震学会2016秋季大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] 深発地震の震源パラメータの再決定と波形インバージョンで推定した3次元内部構造への影響の見積もり2016

    • Author(s)
      山谷里奈、A. Borgeaud、河合研志、R. Geller、小西健介
    • Organizer
      日本地震学会2016秋季大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] Finite frequency effects on apparent S-wave splitting in the lowermost mantle2016

    • Author(s)
      Borgeaud, A., K. Kawai, R. Geller, K. Konishi
    • Organizer
      日本地震学会2016秋季大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] 水飴を用いたマントルプルームのアナログ実験2016

    • Author(s)
      河合研志、熊谷一郎
    • Organizer
      日本地球惑星科学連合2016年大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] Full-waveform inversion for localized 3-D S-velocity structure in D” beneath the Caribbean using USArray data2016

    • Author(s)
      Borgeaud, A., K. Konishi, K. Kawai, R.Geller
    • Organizer
      日本地球惑星科学連合2016年大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] Waveform inversion for 3-D shear wave velocity structure within D” beneath the Northern Pacific and Alaska2016

    • Author(s)
      Suzuki, Y., K. Kawai, R. J. Geller, K. Konishi
    • Organizer
      日本地球惑星科学連合2016年大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] Estimate of subduction rate of island arcs to the deep mantle2016

    • Author(s)
      Ichikawa, H., S. Yamamoto, K. Kawai, M. Kameyama
    • Organizer
      日本地球惑星科学連合2016年大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] 鉄と鉄-炭素合金の高温高圧弾性特性2016

    • Author(s)
      土屋 卓久、桑山 靖弘、石井 水晶、河合 研志
    • Organizer
      日本地球惑星科学連合2016年大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] Geoelectromagnetic jerks produced by heterogeneous electrical conductivity in the D" layer2016

    • Author(s)
      Shimizu, H., H. Utada
    • Organizer
      日本地球惑星科学連合2016年大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] Inverse geodynamo modeling to construct geomagnetic field models and dynamo scaling-laws2016

    • Author(s)
      Shimizu, H., T. Hatakeyama, H. Toh
    • Organizer
      地球電磁気・地球惑星圏学会秋季大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] Compatibility of an Observed Geoelectric Jerk With Field Variations Influenced by Highly Electrically Conducting LLSVP2016

    • Author(s)
      Shimizu, H., H. Utada
    • Organizer
      アメリカ地球物理学連合2016年秋季大会
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Sensitivity of core phases to F-layer structure2016

    • Author(s)
      Ohtaki, T., S. Kaneshima
    • Organizer
      日本地球惑星科学連合2016年大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] Seismological evidence for heterogeneous lowermost outer core of the Earth from PKiKP-PKPbc differential traveltime and dispersion in PKPbc2016

    • Author(s)
      Ohtaki, T., S. Kaneshima, H. Ichikawa, T. Tsuchiya
    • Organizer
      アメリカ地球物理学連合2016年秋季大会
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Relative Importance of Intrinsic and Scattering Attenuation in the Lower Mantle2016

    • Author(s)
      Takeuchi, N.
    • Organizer
      日本地球惑星科学連合2016年大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] 実体波エンベロープにあるアセノスフェアの高減衰性の証拠2016

    • Author(s)
      竹内 希
    • Organizer
      日本地震学会2016秋季大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] Towards local tomography models with uncertainties, International Workshop:Neutrino Research and Thermal Evolution of the Earth2016

    • Author(s)
      Takeuchi, N.
    • Organizer
      International Workshop:Neutrino Research and Thermal Evolution of the Earth
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Array analyses of SmKS waves and the stratification of Earth’s outermost core2016

    • Author(s)
      Kaneshima S.
    • Organizer
      第15回地球深部研究国際シンポジウム
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] SiO2 Saturation in the Outer Core2016

    • Author(s)
      Helffrich, G., K. Hirose, G. Morard, R. Sinmyo, J. Hernlund
    • Organizer
      第15回地球深部研究国際シンポジウム
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Outer Core Stratification by crystallization of SiO22016

    • Author(s)
      Helffrich, G., K. Hirose, G. Morard, R. Sinmyo
    • Organizer
      第15回地球深部研究国際シンポジウム
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A possible new host mineral of large-ion elements in the Earth’s deep interior2015

    • Author(s)
      Kawai, K. Tsuchiya, T.
    • Organizer
      AGU2016
    • Place of Presentation
      San Francisco (USA)
    • Year and Date
      2015-12-14
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Full-waveform Inversion for Localized 3-D S-velocity Structure in D" Beneath the Caribbean using US-Array Data2015

    • Author(s)
      Borgeaud, A., Konishi, K., Kawai, K., Geller, R.J.
    • Organizer
      AGU2016
    • Place of Presentation
      San Francisco (USA)
    • Year and Date
      2015-12-14
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] High-P,T Elasticity of Hcp Iron: Reinvestigation of the Applicability of Hcp Iron to the Earth’s Inner Core2015

    • Author(s)
      Tsuchiya,T., Kawai, K., Kuwayama,Y., Ohsumi, M., Ishii, M.
    • Organizer
      AGU2016
    • Place of Presentation
      San Francisco (USA)
    • Year and Date
      2015-12-14
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Adjacent high- and low-velocity regions around the western edge pf the Pacific Large-Low Shear Velocity Province2015

    • Author(s)
      Tanaka, S.
    • Organizer
      International Workshop The Earth’s Mantle and Core: Structure, Composition, Evolution
    • Place of Presentation
      道後プリンスホテル(愛媛県松山市)
    • Year and Date
      2015-11-05
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Waveform inversion for 3D structure in D"2015

    • Author(s)
      Kawai, K.
    • Organizer
      International Workshop The Earth’s Mantle and Core: Structure, Composition, Evolution
    • Place of Presentation
      道後プリンスホテル(愛媛県松山市)
    • Year and Date
      2015-11-05
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Full waveform inversion for 3D S-velocity structure in the D" region2015

    • Author(s)
      Kawai, K.
    • Organizer
      第138回 地球電磁気・地球惑星圏学会総会・講演会
    • Place of Presentation
      東京大学(東京都文京区)
    • Year and Date
      2015-10-31
    • Related Report
      2015 Annual Research Report
    • Invited
  • [Presentation] 波形インバージョンによるハワイ下のD"層の 3次元S波速度構造推定2015

    • Author(s)
      鈴木裕輝、河合研志、小西健介、ゲラー・ロバート
    • Organizer
      2015年度日本地震学会秋季大会
    • Place of Presentation
      神戸コンベンションセンター(兵庫県神戸市)
    • Year and Date
      2015-10-27
    • Related Report
      2015 Annual Research Report
  • [Presentation] Waveform inversion for three-dimensional S-wave velocity structure in D" beneath the Caribbean2015

    • Author(s)
      Borgeaud A., Konishi, K., Kawai, K., Geller, R.J.
    • Organizer
      2015年度日本地震学会秋季大会
    • Place of Presentation
      神戸コンベンションセンター(兵庫県神戸市)
    • Year and Date
      2015-10-27
    • Related Report
      2015 Annual Research Report
  • [Presentation] Temperature profile and chemical heterogeneity in the lowermost mantle from seismological and mineral physics joint modeling2015

    • Author(s)
      Kawai, K.
    • Organizer
      2th Japanese-German Frontiers of Science Symposium (JGFoS)
    • Place of Presentation
      Kyoto Brighton Hotel (京都府京都市)
    • Year and Date
      2015-10-03
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Seismic Tomography by Statistical Approach2015

    • Author(s)
      Takeuchi, N.
    • Organizer
      Workshop ERI-IPGP: Geodynamics, earthquakes and volcanic eruptions
    • Place of Presentation
      パリ(フランス)
    • Year and Date
      2015-09-24
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] D"内部構造とその高精度探査の可能性2015

    • Author(s)
      河合研志
    • Organizer
      研究集会「地球内部構造の観測・監視技術の現状と未来」
    • Place of Presentation
      東京大学(東京都文京区)
    • Year and Date
      2015-09-10
    • Related Report
      2015 Annual Research Report
  • [Presentation] 「核-マントルの地震・電磁気観測」の概要2015

    • Author(s)
      田中 聡
    • Organizer
      科研費新学術領域「核-マントル共進化」キックオフシンポジウム
    • Place of Presentation
      愛媛大学(愛媛県松山市)
    • Year and Date
      2015-08-08
    • Related Report
      2015 Annual Research Report
  • [Presentation] マントル最下部異方性と鉱物物理的考察2015

    • Author(s)
      河合研志
    • Organizer
      科研費新学術領域「核-マントル共進化」キックオフシンポジウム
    • Place of Presentation
      愛媛大学(愛媛県松山市)
    • Year and Date
      2015-08-08
    • Related Report
      2015 Annual Research Report
  • [Presentation] Global tomography below and above the core-mantle boundary2015

    • Author(s)
      Houser C.
    • Organizer
      科研費新学術領域「核-マントル共進化」キックオフシンポジウム
    • Place of Presentation
      愛媛大学(愛媛県松山市)
    • Year and Date
      2015-08-08
    • Related Report
      2015 Annual Research Report
  • [Presentation] Properties of the F layer at the base of the outer core2015

    • Author(s)
      Helffrich, G.
    • Organizer
      科研費新学術領域「核-マントル共進化」キックオフシンポジウム
    • Place of Presentation
      愛媛大学(愛媛県松山市)
    • Year and Date
      2015-08-08
    • Related Report
      2015 Annual Research Report
  • [Book] Deep Earth: Physics and Chemistry of the Lower Mantled Core2016

    • Author(s)
      Hidenori Terasaki, Rebecca A Fischer, George Helffrich
    • Total Pages
      312
    • Publisher
      American Geophysical Union
    • Related Report
      2015 Annual Research Report
  • [Remarks] 海洋アセノスフェアの「柔らかさ」のその場観測に成功~アセノスフェアを観測する新たな手段~

    • URL

      http://www.eri.u-tokyo.ac.jp/wp-content/uploads/2017/12/science_takeuchi.pdf

    • Related Report
      2017 Annual Research Report
  • [Remarks] 古プレートの核・マントル境界への沈み込みを初めて確認

    • URL

      http://www.s.u-tokyo.ac.jp/ja/press/2017/5653/

    • Related Report
      2017 Annual Research Report

URL: 

Published: 2015-07-02   Modified: 2019-07-17  

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