Seismic and geo-electromagnetic observations of core and mantle

• Project Area: Interaction 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 Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Japan 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), グループリーダー (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, 研究員 (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, 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: Completed (Fiscal Year 2019)
• Budget Amount: ¥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: 地震観測 / 下部マントル / マントル最下部 / 内核最上部 / 核ーマントル / 地震波 / 地球電磁気 / 古地磁気 / 地震 / 電磁気 / 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

本研究では、核-マントル境界領域や内核の不均質構造に注目し、新規観測データを用いて地震波速度不均質などの観測精度を向上させることで、新学術研究領域「核-マントルの相互作用と共進化~統合的地球深部科学の創成~」が掲げる動的地球深部科学の創成に貢献することを目的としている。
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. タイにおける広帯域地震観測の概要を報告した（田中、河合、川勝、竹内）。2. 世界中の沈み込み帯直下下部マントルにおける地震波散乱体を調査した（金嶋）。3.中央アメリカ直下マントル最下部の沈み込んだプレートの周辺に超低速度域を検出し、中央海嶺玄武岩が沈み込んでいれば溶融している可能性を指摘した（竹内）。4. 内核表面における地震波速度異方性を内核反射波PKiKPの振幅変化から初めて推定した(Helffrich)。5. 北太平洋直下における内核半球構造の境界の幅が約600kmと非常に急峻であることをを明らかにし、従来の内核不均質性の生成モデルでは十分に説明できないことを示した（川勝、竹内）。6. 400-500万年前の古地磁気絶対強度を測定した（山本）。7. 西太平洋直下マントル最下部における詳細なS波３次元速度構造を明らかにし、従来、巨大な低速度体と考えられていた領域の内部に微細な構造を見出し、熱的な不均質が卓越すること、沈み込んだプレートがマントルプルームの発生を誘発する可能性を指摘した（河合、田中）。8. 北極域の内核最上部の地震波速度構造を明らかにした。北極域のP波速度は平均よりやや小さく、アメリカやアフリカなどの西半球に見られる構造に近いことが判明した。（大滝、田中、金嶋）。
これらの結果に基づき、他の計画研究班と連携し、新学術領域の成果の取りまとめを行なった。

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] マヒドン大学(タイ)
• [Int'l Joint Research] ユタ大学(米国)
• [Int'l Joint Research] モンペリエ大学(フランス)
• [Int'l Joint Research] マヒドン大学(タイ)
• [Int'l Joint Research] 国立地球物理学研究所/地震学研究所(インド)
• [Int'l Joint Research] オースラリア国立大学(オーストラリア)
• [Int'l Joint Research] ミネソタ大学/コロンビア大学/ミシガン大学(米国)
• [Int'l Joint Research] 中国科学院/香港大学(中国)
• [Int'l Joint Research]
• [Int'l Joint Research] マヒドン大学理学部(タイ王国)
• [Int'l Joint Research] インド国立地球物理研究所(インド)
• [Int'l Joint Research] オーストラリア国立大学(オーストラリア)
• [Int'l Joint Research] 中国科学院(中華人民共和国)
• [Int'l Joint Research] 台湾中央研究院(中華民国)
• [Int'l Joint Research]
• [Int'l Joint Research] マヒドン大学理学部(タイ王国)
• [Int'l Joint Research] インド国立地球物理研究所(インド)
• [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)
• [Int'l Joint Research] 中国科学院(中華人民共和国)
• [Int'l Joint Research] 台湾中央研究院(中華民国)
• [Int'l Joint Research]
• [Int'l Joint Research] マヒドン大学理学部(タイ王国)
• [Int'l Joint Research] ユタ大学(アメリカ合衆国)
• [Int'l Joint Research] オーストラリア国立大学(オーストラリア)
• [Journal Article] Seismic velocity structure of the upper inner core in the north polar region (2021)
  • Author(s): Ohtaki Toshiki、Tanaka Satoru、Kaneshima Satoshi、Siripunvaraporn Weerachai、Boonchaisuk Songkhun、Noisagool Sutthipong、Kawai Kenji、Kim Taewoon、Suzuki Yuki、Ishihara Yasushi、Miyakawa Koji、Takeuchi Nozomu
  • Journal Title: Phys. Earth Planet. Inter. Volume: 311 Pages: 106636-106636
  • DOI: 10.1016/j.pepi.2020.106636
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Effect of core electrical conductivity on core surface flow models (2020)
  • Author(s): Matsushima Masaki
  • Journal Title: Earth, Planets and Space Volume: 72
  • DOI: 10.1186/s40623-020-01269-0
  • Peer Reviewed / Open Access
• [Journal Article] High-resolution 3-D S-velocity structure in the D" region at the western margin of the Pacific LLSVP: Evidence for small-scale plumes and paleoslabs (2020)
  • Author(s): Suzuki Yuki、Kawai Kenji、Geller Robert J.、Tanaka Satoru、Siripunvaraporn Weerachai、Boonchaisuk Songkhun、Noisagool Sutthipong、Ishihara Yasushi、Kim Taewoon
  • Journal Title: Phys. Earth Planet. Inter. Volume: 307 Pages: 106544-106544
  • DOI: 10.1016/j.pepi.2020.106544
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Anisotropy at the Inner Core Boundary (2019)
  • Author(s): Helffrich G.、Mainprice D.
  • Journal Title: Geophysical Research Letters Volume: 46 Pages: 11959-11967
  • DOI: 10.1029/2019gl083644
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The chemical case for Mercury mantle stripping (2019)
  • Author(s): Helffrich George、Brasser Ramon、Shahar Anat
  • Journal Title: Progress in Earth and Planetary Science Volume: 6
  • DOI: 10.1186/s40645-019-0312-z
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Paleomagnetic study of basaltic rocks from Baengnyeong Island, Korea: efficiency of the Tsunakawa?Shaw paleointensity determination on non-SD-bearing materials and implication for the early Pliocene geomagnetic field intensity (2019)
  • Author(s): Ahn Hyeon-Seon、Yamamoto Yuhji
  • Journal Title: Earth, Planets and Space Volume: 71
  • DOI: 10.1186/s40623-019-1107-6
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Melting at the Edge of a Slab in the Deepest Mantle (2019)
  • Author(s): Thorne Michael S.、Takeuchi Nozomu、Shiomi Katsuhiko
  • Journal Title: Geophysical Research Letters Volume: 46 Pages: 8000-8008
  • DOI: 10.1029/2019gl082493
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Seismic scatterers in the lower mantle near subduction zones (2019)
  • Author(s): Satoshi Kaneshima
  • Journal Title: Geophys. J. Int. Volume: 218 Pages: 1873-1891
  • DOI: 10.1093/gji/ggz241
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Sharpness of the hemispherical boundary in the inner core beneath the northern Pacific (2019)
  • Author(s): Iritani Ryohei、Kawakatsu Hitoshi、Takeuchi Nozomu
  • Journal Title: Earth and Planetary Science Letters Volume: 527 Pages: 115796-115796
  • DOI: 10.1016/j.epsl.2019.115796
  • Peer Reviewed
• [Journal Article] Earth's rugged lower mantle (2019)
  • Author(s): Houser Christine
  • Journal Title: Science Volume: 363 Pages: 696-697
  • DOI: 10.1126/science.aaw4601
  • Peer Reviewed
• [Journal Article] 3-D S-velocity structure of the mantle transition zone beneath Central America and the Gulf of Mexico inferred using waveform inversion (2019)
  • Author(s): Anselme F. E. Borgeaud, Kenji Kawai, Robert J. Geller
  • Journal Title: Journal of Geophysical Research: Solid Earth Volume: 124 Pages: 9664-9681
  • DOI: 10.1029/2018jb016924
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] First‐principles Investigation of Frictional Characteristics of Brucite: An Application to Its Macroscopic Frictional Characteristics, Journal of Geophysical Research (2019)
  • Author(s): Hanaya Okuda , Kenji Kawai, Hiroshi Sakuma
  • Journal Title: Journal of Geophysical Research: Solid Earth Volume: 124 Pages: 10423-10443
  • DOI: 10.1029/2019jb017740
  • Peer Reviewed
• [Journal Article] Thai Seismic Array Project (2019)
  • Author(s): Tanaka S. Siripunvaraporn W. Boonchaisuk S. Noisagool S. Kim T. Kawai K. Suzuki Y. Ishihara Y. Iritani R. Miyakawa K. Takeuchi N. Kawakatsu H.
  • Journal Title: 東京大学地震研究所彙報 Volume: 94 Pages: 1-11
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Topography of the western Pacific LLSVP constrained by S-wave multipathing (2019)
  • Author(s): Roy Sunil K、Takeuchi Nozomu、Srinagesh D、Ravi?Kumar M、Kawakatsu Hitoshi
  • Journal Title: Geophysical Journal International Volume: 218 Pages: 190-199
  • DOI: 10.1093/gji/ggz149
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Radial and Azimuthal Anisotropy Tomography of the NE Japan Subduction Zone: Implications for the Pacific Slab and Mantle Wedge Dynamics (2018)
  • Author(s): Ishise Motoko、Kawakatsu Hitoshi、Morishige Manabu、Shiomi Katsuhiko
  • Journal Title: Geophysical Research Letters Volume: 45 Pages: 3923-3931
  • DOI: 10.1029/2018gl077436
  • Peer Reviewed
• [Journal Article] Seismological evidence for laterally heterogeneous lowermost outer core of the Earth (2018)
  • Author(s): T. Ohtaki, S. Kaneshima, H. Ichikawa, T. Tsuchiya
  • Journal Title: Journal of Geophysical Research: Solid Earth Volume: 123 Pages: 10903-10917
  • DOI: 10.1029/2018jb015857
  • Peer Reviewed
• [Journal Article] Paleointensity Study on the Holocene Surface Lavas on the Island of Hawaii Using the Tsunakawa?Shaw Method (2018)
  • Author(s): Yamamoto Yuhji、Yamaoka Ryo
  • Journal Title: Frontiers in Earth Science Volume: 6 Pages: 48-48
  • DOI: 10.3389/feart.2018.00048
  • Peer Reviewed
• [Journal Article] An initial case study to deconvolve natural remanent magnetization of a continuous paleomagnetic sample using the software UDECON (2018)
  • Author(s): Yamamoto Y., Yamazaki T., Kanamatsu T.
  • Journal Title: Earth, Planets and Space Volume: 70 Pages: 160-160
  • DOI: 10.1186/s40623-018-0931-4
  • Peer Reviewed / Open Access
• [Journal Article] Effects of redetermination of source time functions on the 3-D velocity structure inferred by waveform inversion (2018)
  • Author(s): Yamaya Lina、Borgeaud Anselme F.E.、Kawai Kenji、Geller Robert J.、Konishi Kensuke
  • Journal Title: Physics of the Earth and Planetary Interiors Volume: 282 Pages: 117-143
  • DOI: 10.1016/j.pepi.2018.04.012
  • Peer Reviewed / Open Access
• [Journal Article] On the geomagnetic secular variation in the Pacific region (2018)
  • Author(s): Yukutake Takesi、Shimizu Hisayoshi
  • Journal Title: Physics of the Earth and Planetary Interiors Volume: 283 Pages: 122-130
  • DOI: 10.1016/j.pepi.2018.08.008
  • Peer Reviewed
• [Journal Article] Relative Paleointensity and Inclination Anomaly Over the Last 8?Myr Obtained From the Integrated Ocean Drilling Program Site U1335 Sediments in the Eastern Equatorial Pacific (2018)
  • Author(s): Yamazaki Toshitsugu、Yamamoto Yuhji
  • Journal Title: Journal of Geophysical Research: Solid Earth Volume: 123 Pages: 7305-7320
  • DOI: 10.1029/2018jb016209
  • Peer Reviewed
• [Journal Article] A generating process of geomagnetic drifting field (2018)
  • Author(s): Yukutake Takesi、Shimizu Hisayoshi
  • Journal Title: Earth, Planets and Space Volume: 70 Pages: 145-145
  • DOI: 10.1186/s40623-018-0908-3
  • Peer Reviewed / Open Access
• [Journal Article] 外核Ｆ層の速度 (2018)
  • Author(s): 大滝 壽樹，金嶋聡
  • Journal Title: 月刊地球 Volume: 40 Pages: 365-370
• [Journal Article] A Sharp Structural Boundary in Lowermost Mantle Beneath Alaska Detected by Core Phase Differential Travel Times for the Anomalous South Sandwich Islands to Alaska Path (2018)
  • Author(s): Long Xin、Kawakatsu Hitoshi、Takeuchi Nozomu
  • Journal Title: Geophysical Research Letters Volume: 45 Pages: 176-184
  • DOI: 10.1002/2017gl075685
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Array analyses of SmKS waves and the stratification of Earth's outermost core (2018)
  • 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
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Seismic scatterers in the mid-lower mantle beneath Tonga-Fiji (2018)
  • 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
  • Peer Reviewed
• [Journal Article] Core-exsolved SiO2 dispersal in the Earth's mantle (2018)
  • 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
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Isotopic signature of core-derived SiO2 (2018)
  • Author(s): Helffrich, G., Shahar, A., Hirose K.
  • Journal Title: American Mineralogist Volume: -
  • DOI: 10.2138/am-2018-6482ccbyncnd
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] High-pressure phase transitions of anorthosite crust in the Earth’s deep mantle (2018)
  • 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
  • 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
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A finite strain approach to thermal expansivity’s pressure dependence (2017)
  • Author(s): Helffrich George
  • Journal Title: American Mineralogist Volume: 102 Pages: 1690-1695
  • DOI: 10.2138/am-2017-6007
  • Peer Reviewed / Open Access
• [Journal Article] Determination of intrinsic attenuation in the oceanic lithosphere-asthenosphere system (2017)
  • 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
  • Peer Reviewed
• [Journal Article] Imaging paleoslabs in the D″ layer beneath Central America and the Caribbean using seismic waveform inversion (2017)
  • 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
  • Peer Reviewed / Open Access
• [Journal Article] Persistence of strong silica-enriched domains in the Earth’s lower mantle (2017)
  • 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
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] SiO2 crystallization and compositional evolution of the Earth’s core (2017)
  • 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
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Differential Monte Carlo method for computing seismogram envelopes and their partial derivatives (2016)
  • Author(s): Takeuchi, N.
  • Journal Title: Journal of Geophysical Research, Solid Earth Volume: 121 Pages: 2428-3444
  • DOI: 10.1002/2015jb012661
  • Peer Reviewed
• [Journal Article] Global seismic data reveal little water in the mantle transition zone (2016)
  • Author(s): Houser C.
  • Journal Title: Earth and Planetary Science Letters Volume: 448 Pages: 94-101
  • DOI: 10.1016/j.epsl.2016.04.018
  • Peer Reviewed
• [Journal Article] Finite frequency effects on apparent S-wave splitting in the D” layer: comparison between ray theory and full-wave synthetics (2016)
  • 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
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Waveform inversion for 3-D shear velocity structure of D” beneath the Northern Pacific: Possible evidence for a remnant slab and a ‘passive plume’ (2016)
  • 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
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] A new fifth parameter for transverse isotropy II: partial derivatives (2016)
  • Author(s): Kawakatsu, H.
  • Journal Title: Geophysical Journal International Volume: 206 Pages: 360-367
  • DOI: 10.1093/gji/ggw152
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] On the latitude dependence of drift velocity of the geomagnetic main field and its secular variation (2016)
  • 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
  • Peer Reviewed
• [Journal Article] Drifting and standing fields in the geomagnetic field for the past 400 years (2015)
  • 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
  • Peer Reviewed
• [Journal Article] Complex inner core boundary from frequency characteristics of the reflection coefficients of PKiKP waves observed by Hi-net (2015)
  • 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
  • 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 travel time and dispersion in PKPbc (2015)
  • Author(s): T. Ohtaki & S. Kaneshima
  • Journal Title: Journal of Geophysical Research Solid Earth Volume: 120 Pages: 1-15
  • DOI: 10.1002/2015jb012140
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Thai Seismic Array (TSAR) Project (2019)
  • Author(s): Satoru Tanaka
  • Organizer: International Workshop for Geophysical observation in Thailand _ Present and Future _
  • Int'l Joint Research
• [Presentation] Azimuthal anisotropy in the lowermost mantle beneath Philippine from ScS_S travel times (2019)
  • Author(s): Satoru Tanaka
  • Organizer: JpGU2019
• [Presentation] Azimuthal variation of ScS_S differential travel times beneath Philippine: Implications for anisotropy in the lowermost mantle (2019)
  • Author(s): Satoru Tanaka
  • Organizer: AGU2019
  • Int'l Joint Research
• [Presentation] Seismic structure near the inner core boundary determined by using TSAR network (2019)
  • Author(s): Toshiki Ohtaki
  • Organizer: International Workshop for Geophysical observation in Thailand _ Present and Future _
  • Int'l Joint Research
• [Presentation] Lateral heterogeneity in the lowermost outer core (F layer) of the Earth revealed by seismic analyses (2019)
  • Author(s): Toshiki Ohtaki
  • Organizer: JpGU2019
• [Presentation] Seismic structure near the inner core boundary in the north polar region (2019)
  • Author(s): Toshiki Ohtaki
  • Organizer: AGU2019
  • Int'l Joint Research
• [Presentation] ScSリバーバレーション解析による海洋上部マントルにおけるG不連続面の推定について (2019)
  • Author(s): 丸山 純平、川勝 均、竹内 希
  • Organizer: JpGU2019
• [Presentation] Sharpness of the hemispherical boundary in the inner core beneath the northern Pacific (2019)
  • Author(s): Ryohei Iritani, Hitoshi Kawakatsu, Nozomu Takeuchi
  • Organizer: JpGU2019
• [Presentation] A low-velocity layer atop the mantle transition zone beneath Mexican gulf inferred from triplicated P and S waves (2019)
  • Author(s): XIN LONG, Hitoshi Kawakatsu, Nozomu Takeuchi
  • Organizer: SSJ2019
• [Presentation] ScS多重反射の波形インバージョンによる上部マントル不連続面の推定に ついて (2019)
  • Author(s): 丸山 純平、川勝 均、竹内 希
  • Organizer: SSJ2019
• [Presentation] New progress in building Paci%c Array: an international collaboration to image mantle dynamic processes across the PaciFc basin (2019)
  • Author(s): Hitoshi Kawakatsu, James B Gaherty, Hisashi Utada, Sang-Mook Lee, Younghee Kim and Zachary Eilon
  • Organizer: AGU2019
  • Int'l Joint Research / Invited
• [Presentation] Sharpness of the hemispherical boundary in the inner core beneath the northern PaciFc (2019)
  • Author(s): Hitoshi Kawakatsu, Ryohei Iritani and Nozomu Takeuchi
  • Organizer: AGU2019
  • Int'l Joint Research
• [Presentation] Unraveling Earth Interior from the Ocean (Centennial Central) (2019)
  • Author(s): Hitoshi Kawakatsu
  • Organizer: AGU2019
  • Int'l Joint Research / Invited
• [Presentation] Possible interaction between the core and mantle inferred from a core surface flow model (2019)
  • Author(s): Masaki Matsushima
  • Organizer: JpGU2019
• [Presentation] Effects of core electrical conductivity on core surface flow models (2) (2019)
  • Author(s): Masaki Matsushima
  • Organizer: Core-Mantle Interaction and Coevolution A01-2, A-02, A03-1 Joint Group Meeting
• [Presentation] Influence of core electrical conductivity on core flow models in a tangentially magnetostrophic state (2019)
  • Author(s): Masaki Matsushima
  • Organizer: AGU2019
  • Int'l Joint Research
• [Presentation] New Constraints on Seismological Structures of the Oceanic Asthenosphere (2019)
  • Author(s): Nozomu Takeuchi, Hitoshi Kawakatsu, Hajime Shiobara, Takehi Isse, Hiroko Sugioka, Aki Ito, Hisashi Utada
  • Organizer: JpGU2019
  • Invited
• [Presentation] Inversion of Longer Period OBS Waveforms for P Structures in the Oceanic Lithosphere and Asthenosphere (2019)
  • Author(s): Nozomu Takeuchi, Hitoshi Kawakatsu, Hajime Shiobara, Takehi Isse, Hiroko Sugioka, Aki Ito, Hisashi Utada
  • Organizer: AGU2019
  • Int'l Joint Research
• [Presentation] Regularity of geomagnetic field variations around 2003 and 2007: possible influence of the electrical conductivity heterogeneity at the bottom of the mantle_ (2019)
  • Author(s): Hisayoshi Shimizu
  • Organizer: AGU2019
  • Int'l Joint Research
• [Presentation] Paleomagnetic Study of the IODP Site U1335 Sediments in the Eastern Equatorial Pacific - Relative Paleointensity and Inclination Anomaly Over the Last 8 Myr (2019)
  • Author(s): Yamazaki T., Yamamoto, Y.
  • Organizer: Asia Oceania Geosciences Society (AOGS) 16th Annual Meeting
  • Int'l Joint Research
• [Presentation] Preliminary report on the relative paleointensity variation during the Eocene deduced from the IODP Sites U1403 and U1408 marine sediments recovered from the northwest Atlantic (2019)
  • Author(s): Yamamoto Y., Fukami H., Taniguchi W., Lippert, P.C.
  • Organizer: AGU2019
  • Int'l Joint Research
• [Presentation] 東赤道太平洋 IODP Site U1335 堆積物の古地磁気学的研究 ー 過去800万年間の相対古地磁気強度と伏角異常 (2019)
  • Author(s): 山本裕二, 山崎俊嗣
  • Organizer: JpGU2019
• [Presentation] Preliminary report on the paleointensity variation during 38-50 Ma deduced from the marine sediments recovered from the northwest Atlantic (2019)
  • Author(s): 山本裕二, 深見洋仁, 谷口若菜, Lippert Peter
  • Organizer: JpGU2019
• [Presentation] An Agnostic Tool for Interpreting Shear and Compressional Velocity Tomography (2019)
  • Author(s): Christine Houser
  • Organizer: AGU2019
  • Int'l Joint Research
• [Presentation] Anisotropy at the Inner Core Boundary (2019)
  • Author(s): George Helffrich
  • Organizer: AGU2019
  • Int'l Joint Research
• [Presentation] Waveform inversion for 3D anisotropic structure in D" beneath the Northern Pacific: Constraints on mineralogy and flow in the lowermost mantle (2019)
  • Author(s): Yuki Suzuki, Kenji Kawai, Robert J. Geller
  • Organizer: JpGU2019
• [Presentation] Detailed 3-D S-velocity structure within D" at the western Pacific LLSVP margin: smaller scale plumes and paleoslabs (2019)
  • Author(s): Yuki Suzuki, Kenji Kawai, Robert J. Geller, Satoru Tanaka, Weerachai Siripuvaraporn, Songkhun Boonchaisuku, Noisagool Sutthipong, Yasushi Ishihara, Taweoon Kim, Koji Miyakawa, Nozomu Takeuchi
  • Organizer: JpGU2019
• [Presentation] Origin and role of lost continents (2019)
  • Author(s): Shigenori Maruyama, Kenji Kawai, Greaux Steeve, Dapeng Zhao
  • Organizer: JpGU2019
• [Presentation] Imaging subducted slabs in the mantle from inversion of seismic waves (2019)
  • Author(s): Kenji Kawai
  • Organizer: International Workshop for Geophysical observation in Thailand _ Present and Future _
  • Int'l Joint Research
• [Presentation] Imaging subducted slabs in the lowermost mantle from inversion of seismic waveforms (2019)
  • Author(s): Kenji Kawai, Anselme F.E. Borgeaud, Yuki Suzuki
  • Organizer: 2019年度 日本地球化学会年会
  • Invited
• [Presentation] Retrieval of converted phases from shallow structure of the Ontong Java Plateau (2018)
  • Author(s): Takashi Tonegawa, Daisuke Suetsugu, Seiichi Miura, Hajime Shiobara, Hiroko Sugioka, Aki Ito, Takehi Isse, Yasushi Ishihara, Satoru Tanaka, Masayuki Obayashi, Junko Yoshimitsu, Takumi Kobayashi
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] Seismic attenuation in the mantle beneath the Ontong Java Plateau from multiple ScS waves (2018)
  • Author(s): Daisuke Suetsugu, Hajime Shiobara, Hiroko Sugioka, Aki Ito, Takehi Isse, Yasushi Ishihara, Satoru Tanaka, Masayuki Obayashi, Takashi Tonegawa, Junko Yoshimitsu, Takumi Kobayashi
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] Shear wave upper mantle structure beneath the Ontong Java Plateau (2018)
  • Author(s): Takehi Isse, Daisuke Suetsugu, Hajime Shiobara, Hiroko Sugioka, Aki Ito, Yasushi Ishihara, Satoru Tanaka, Masayuki Obayashi, Takashi Tonegawa, Junko Yoshimitsu, Takumi Kobayashi
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] The OJP array: seismological and electromagnetic observation on seafloor and islands in the Ontong Java Plateau (2018)
  • Author(s): Daisuke Suetsugu, Hajime Shiobara, Hiroko Sugioka, Noriko Tada, Aki Ito, Takehi Isse, Kiyoshi Baba, Hiroshi Ichihara, Toyonobu Ota, Yasushi Ishihara, Satoru Tanaka, Masayuki Obayashi, Takashi Tonegawa, Junko Yoshimitsu, Takumi Kobayashi, Hisashi Utada
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] Multifrequency P-wave tomography of Ontong Java Plateau (2018)
  • Author(s): Masayuki Obayashi, Junko Yoshimitsu, Daisuke Suetsugu, Hajime Shiobara, Hiroko Sugioka, Aki Ito, Takehi Isse, Yasushi Ishihara, Satoru Tanaka, Takashi Tonegawa, Takumi Kobayashi
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] Shear wave splitting observed in the Ontong Java Plateau and adjacent regions (2018)
  • Author(s): Satoru Tanaka, Daisuke Suetsugu, Hajime Shiobara, Hiroko Sugioka, Aki Ito, Takehi Isse, Yasushi Ishihara, Masayuki Obayashi, Takashi Tonegawa, Junko Yoshimitsu, Takumi Kobayashi
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] A preliminary model for S-wave velocity structure in the D" region beneath New Guinea by using Thai Seismic Array (TSAR) (2018)
  • Author(s): S. Tanaka, W. Siripunvaraporn, S. Boonchaisuk, S. Noisagool, K. Kawai, Y. Suzuki, Y. Ishihara, T. Kim, K. Miyakawa, N. Takeuchi, H. Kawakatsu
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] ScS-S走時差残差の方位変化によるフィリピン直下下部マントルの方位異方性 (2018)
  • Author(s): 田中 聡
  • Organizer: 2018年地震学会秋季大会
• [Presentation] オントン・ジャワ海台下のP波速度構造 (2018)
  • Author(s): Masayuki Obayashi, Junko Yoshimitsu, Daisuke Suetsugu, Hajime Shiobara, HIroko Sugioka, Aki Ito, Takehi Isse, Yasushi Ishihara, Satoru Tanaka, Takashi Tonegawa, Takumi Kobayashi
  • Organizer: 2018年地震学会秋季大会
• [Presentation] Receiver function imaging at the crust and uppermost mantle of Ontong Java Plateau (2018)
  • Author(s): Takashi Tonegawa, Daisuke Suetsugu, Seiichi Miura, Hajime Shiobara, Hiroko Sugioka, Aki Ito, Takehi Isse, Yasushi Ishihara, Satoru Tanaka, Masayuki Obayashi, Junko Yoshimitsu, Takumi Kobayashi
  • Organizer: AGU fall meeting 2018
  • Int'l Joint Research
• [Presentation] Thai Seismic Array (TSAR) Project (2018)
  • Author(s): Satoru Tanaka, Weerachai Siripunvarporn, Songkhun Boonchaisuk, Sutthipong Noisagool, Kenji Kawai, Taewoon Kim, Yuki Suzuki, Yasushi Ishihara, Koji Miyakawa, Nozomu Takeuchi, Hitoshi Kawakatsu
  • Organizer: SEDI2018
  • Int'l Joint Research
• [Presentation] Seismic scatterers in the mid-lower mantle near subduction zones (2018)
  • Author(s): Satoshi Kaneshima
  • Organizer: SEDI2018
  • Int'l Joint Research
• [Presentation] 内核西半球内における1次元減衰・速度構造の地域 特性_ (2018)
  • Author(s): 入谷良平・川勝均・竹内希(東大地震研)・D. Srinagesh_
  • Organizer: 2018年地震学会秋季大会
• [Presentation] Characteristic regional variation of 1D attenuation and velocity profiles in the western hemisphere of the Earth’s inner core_ (2018)
  • Author(s): Ryohei Iritani, Hitoshi Kawakatsu, Nozomu Takeuchi_
  • Organizer: 2018年地震学会秋季大会
• [Presentation] 見かけの異方性を考慮した P波方位異方性と鉛直異方性の解釈:東北地方_ (2018)
  • Author(s): 石瀬 素子，川勝 均，森重 学，汐見 勝彦
  • Organizer: 2018年地震学会秋季大会
• [Presentation] 日本列島下のPS変換面イメージング2.0 (2018)
  • Author(s): 川勝 均・金慧貞_
  • Organizer: 2018年地震学会秋季大会
• [Presentation] Scattered wavefield imaging of the Japan subduction structure using Hi-net array data (2018)
  • Author(s): Younghee Kim、Hitoshi Kawakatsu
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] Preliminary study using harmonic decomposition of receiver functions to image non-isotropic characteristics of Japan subduction zone (2018)
  • Author(s): HyeJeong Kim1、Hitoshi Kawakatsu、Takeshi Akuhara
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] Observation of multipathing at the western edge of the Pacific Large Low-Shear-Velocity Province (2018)
  • Author(s): Sunil K. Roy1、Nozomu Takeuchi、D. Srinagesh、M. Ravi Kumar、Hitoshi Kawakatsu
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] Tsunakawa-Shaw Paleointensity Method Applied to the Holocene Surface Lavas in Hawai (2018)
  • Author(s): Yamamoto, Y., Yamaoka, R.
  • Organizer: Asia Oceania Geosciences Society (AOGS) 15th Annual Meeting
  • Int'l Joint Research
• [Presentation] Strength of the geomagnetic field during the Holocene deduced from the surface lavas on the island of Hawaii (2018)
  • Author(s): 山本裕二, 山岡 亮
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] 火山岩と海底堆積物から探る過去の地磁気強度変動 (2018)
  • Author(s): 山本裕二
  • Organizer: 地球環境史学会第４回年会
  • Invited
• [Presentation] UDECONソフトウエアによる古地磁気連続試料の自然残留磁化のデコンボルーションの実例 (2018)
  • Author(s): 山本裕二, 山崎俊嗣, 金松敏也
  • Organizer: 地球電磁気・地球惑星圏学会第144回講演会
• [Presentation] High resolution paleomagnetic secular variation records from Lake Biwa and its implications on core dynamics (2018)
  • Author(s): 小田啓邦, 山本裕二, 井内美郎
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] Rock-magnetic properties of single crystals separated from granitic rocks: A guide for selecting samples for paleointensity determination (2018)
  • Author(s): 加藤千恵, 佐藤雅彦, 山本裕二, 綱川秀夫, Kirschvink Joseph
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] Paleointensity experiments on single crystals separated from the middle Cretaceous Iritono granite (2018)
  • Author(s): 加藤千恵, 佐藤雅彦, 山本裕二, 綱川秀夫, Kirschvink Joseph
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] Preliminary report on sedimentary structure and magnetostratigraphy of IODP Site U1490 (2018)
  • Author(s): 熊谷祐穂, 中村教博, Hatfield Robert, 山崎俊嗣, 山本 裕二, 国際深海科学掘削計画第363次乗船研究者
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] Paleointensity experiments on diverse contemporaneous volcanic materials (2018)
  • Author(s): Ahn Hyeon-Seon, 山本裕二
  • Organizer: 地球電磁気・地球惑星圏学会第144回講演会
• [Presentation] Preliminary report on depositional environment and relative paleomagnetic intensity of IODP Site U1490 (2018)
  • Author(s): 熊谷祐穂, 中村教博, Hatfield Robert G., 山崎俊嗣, 山本裕二
  • Organizer: 地球電磁気・地球惑星圏学会第144回講演会
• [Presentation] Waveform inversion for localized 3-D shear velocity structure in the lowermost mantle beneath Caroline hotspot (2018)
  • Author(s): Shota Kato, Kenji Kawai, Yuki Suzuki
  • Organizer: Japan Geoscience Union Meeting 2018
• [Presentation] Waveform inversion for 3-D S-wave velocity structure of the D窶 region beneath Eurasia (2018)
  • Author(s): Tsubasa Ue, Kenji Kawai, Yuki Suzuki, Robert J. Geller
  • Organizer: Japan Geoscience Union Meeting 2018
• [Presentation] Finite frequency effects on the S wavefields in the lowermost mantle for elastic and density models based on mineral physics (2018)
  • Author(s): Atsuki Oba, Kenji Kawai, Anselme F. E. Borgeaud, Robert J. Geller
  • Organizer: Japan Geoscience Union Meeting 2018
• [Presentation] S-velocity structure of the mantle transition zone beneath the Northwestern Pacific inferred from waveform inversion and its geophysical interpretation (2018)
  • Author(s): Lina Yamaya, Anselme F. E. Borgeaud, Kenji Kawai, Maxim Ballmer
  • Organizer: Japan Geoscience Union Meeting 2018
• [Presentation] Waveform inversion for 3-D S-wave velocity structure of the D窶イ窶イ region beneath Eurasia (2018)
  • Author(s): Tsubasa Ue, Kenji Kawai, Yuki Suzuki, Robert J. Geller
  • Organizer: Japan Geoscience Union Meeting 2018
• [Presentation] 3-D S-velocity structure in the lowermost mantle beneath the Northern Pacific (2018)
  • Author(s): Yuki Suzuki, Kenji Kawai, Robert J. Geller
  • Organizer: Japan Geoscience Union Meeting 2018
• [Presentation] Waveform inversion for the 3-D S-velocity structure of the mantle transition zone beneath Central America using USArray data (2018)
  • Author(s): Anselme F. E. Borgeaud, Kenji Kawai, Robert J. Geller, Maxim Ballmer
  • Organizer: Japan Geoscience Union Meeting 2018
• [Presentation] Paleoslabs in the lowermost mantle detected using seismic waveform inversion (2018)
  • Author(s): Kenji Kawai
  • Organizer: Japan Geoscience Union Meeting 2018
• [Presentation] 3-D S-velocity structure of the transition zone beneath Central America and the Northeastern Pacific from waveform inversion (2018)
  • Author(s): Anselme F. E. Borgeaud, Kenji Kawai, Robert J. Geller
  • Organizer: Asia Oceania Geosciences Society (AOGS) 15th Annual Meeting
  • Int'l Joint Research
• [Presentation] S-velocity structure of the mantle transition zone beneath the Northwestern Pacific inferred from waveform inversion and its geophysical interpretation (2018)
  • Author(s): Lina Yamaya, Anselme F. E. Borgeaud, Kenji Kawai, Maxim Ballmer
  • Organizer: Asia Oceania Geosciences Society(AOGS)15th Annual Meeting
  • Int'l Joint Research
• [Presentation] Effects of core electrical conductivity on core surface flow models (2018)
  • Author(s): Matsushima, M.
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] Core surface flows depending on electrical conductivity (2018)
  • Author(s): Matsushima, M.
  • Organizer: SEDI2018
  • Int'l Joint Research
• [Presentation] A core surface flow and acceleration toward building IGRF-13SV (2018)
  • Author(s): Matsushima, M., Shimizu, H., Takahashi, F., Minami, T., Nakano, S., Toh, H.
  • Organizer: 第144回地球電磁気・地球惑星圏学会
• [Presentation] Core flow interaction at the core-mantle boundary and at the inner core boundary inferred from a core surface flow model (2018)
  • Author(s): Matsushima, M.
  • Organizer: AGU fall meeting 2018
  • Int'l Joint Research
• [Presentation] Correction of ScS-S travel times for 3D mantle structure to reveal shear wave azimuthal anisotropy in the lower mantle (2017)
  • Author(s): Tanaka S.
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research
• [Presentation] Comparison of frequency dependent reflection coefficients at the inner core boundary beneath the central America and western Pacific (2017)
  • 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
  • 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
• [Presentation] Thai Seismic Array (TSAR) Project: Progress in FY2016 (2017)
  • 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
  • Int'l Joint Research
• [Presentation] Seismic attenuation of multiple ScS phases beneath South China Sea (2017)
  • 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
  • Int'l Joint Research
• [Presentation] Structure of Crust and Upper Mantle beneath South China Sea revealed by Surface Wave Tomography (2017)
  • 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
  • Int'l Joint Research
• [Presentation] Seismological evidence for heterogeneous lowermost outer core of the Earth (2017)
  • Author(s): Ohtaki, T., S. Kaneshima, H. Ichikawa, T. Tsuchiya
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research
• [Presentation] Seismological evidence for heterogeneous lowermost outer core of the Earth (2017)
  • 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
  • Int'l Joint Research
• [Presentation] Examination of local geomagnetic jerks using wavelet analysis (2017)
  • Author(s): Shimizu, H., H. Utada
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research
• [Presentation] Intrinsic Attenuations in the Oceanic Lithosphere and Asthenosphere Constrained by Seismogram Envelopes (2017)
  • 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
  • Int'l Joint Research
• [Presentation] Intrinsic Attenuations in the Oceanic Lithosphere and Asthenosphere Constrained by Seismogram Envelopes (2017)
  • Author(s): Takeuchi, N., NOMan Project Team
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research / Invited
• [Presentation] Lithology Distribution Model for Neutrino Flux Simulations Obtained by Using Bayesian Inference (2017)
  • Author(s): Takeuchi, N., KamLAND Simulator Project Team
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research
• [Presentation] ab initio calculations reveal why thermal and compositional variations are required to explain observed mantle shear and compressional velocity anomalies (2017)
  • Author(s): Houser, C., J. Hernlund, J. Valencia-Cardona, R. Wentzcovitch
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research
• [Presentation] Slow velocities and thin transition zone indicate upwelling lower mantle beneath eastern Eurasia (2017)
  • 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
  • Int'l Joint Research
• [Presentation] New developments in Earth’s deep water cycle (2017)
  • Author(s): Houser, C.
  • Organizer: RESCEU Symposium Planet Formation around Snowline
  • Int'l Joint Research
• [Presentation] The failure of 1D seismic model fitting to constrain lower mantle composition (2017)
  • 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
  • Int'l Joint Research
• [Presentation] Thai Seismic Array (TSAR) and overview of the contribution of JAMSTEC to seismological observations in Southeastern Asia (2017)
  • Author(s): Tanaka, S., W. Siripunvaraporn, Y. Ishihara
  • Organizer: Myanmar Applied Earth Sciences Association 2017 Meeting
  • Int'l Joint Research
• [Presentation] High-P, T elasticity of iron-light element alloys (2017)
  • 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
  • Int'l Joint Research
• [Presentation] 3-D S-velocity structure in the lowermost mantle beneath the Northern Pacific (2017)
  • 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
  • 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
• [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
• [Presentation] Velocity structure of the transition zone beneath Central and North America and the Caribbean from waveform inversion (2017)
  • 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
• [Presentation] High-P, T Elasticity of Iron-Light Element Alloys (2017)
  • Author(s): Tsuchiya, T., Y. Kuwayama, M. Ishii, K. Kawai
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research
• [Presentation] Waveform inversion for whole mantle 1-D S-velocity and Q structure beneath Central America and the Caribbean (2017)
  • Author(s): Borgeaud, A. F. E., K. Kawai, R. J. Geller, K. Konishi
  • Organizer: JpGU-AGU Joint Meeting 2017
  • 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 Caribbean (2017)
  • 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
  • Int'l Joint Research
• [Presentation] Velocity structure model dependence of upper, middle and lower crust volume (2016)
  • 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
  • Int'l Joint Research
• [Presentation] Waveform inversion for shear wave velocity structure in the lowermost mantle (2016)
  • 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
  • Int'l Joint Research / Invited
• [Presentation] Seismological Constraints on Velocity and Density in the Earth’s Core (2016)
  • 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
  • Int'l Joint Research
• [Presentation] Thai Seismic Array (TSAR) Project (2016)
  • 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
• [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
• [Presentation] Current Status of Pilot stations of Thai Seismic Array (TSAR) and Preliminary Receiver Function Analysis (2016)
  • 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
• [Presentation] Thai Seismic ARray (TSAR) project and it's future application for tectonic and crustal studies of Thailand (2016)
  • Author(s): Noisagool S., S. Tanaka, H. Kawakatsu, W. Siripunvaraporn, S. Boonchisuk
  • Organizer: The 3rd conference on Tectonic of Northwestern Indochina
  • Int'l Joint Research
• [Presentation] Comparison of frequency dependent amplitude ratios of PKiKP/PcP observed by Hi-net and_USArray (2016)
  • Author(s): Tanaka, S.
  • Organizer: Goldschmidt 2016
  • Int'l Joint Research
• [Presentation] P-wave reflection coefficients at the inner core boundary beneath the central America observed by USArray (2016)
  • Author(s): Tanaka, S., H. Tkalcic
  • Organizer: 第15回地球深部研究国際シンポジウム
  • Int'l Joint Research
• [Presentation] Problems with 1D seismic model fitting (2016)
  • 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
  • Int'l Joint Research
• [Presentation] A 3D Temperature Map of the Lower Mantle (2016)
  • Author(s): Houser, C., R.M. Wentzcovitch
  • Organizer: Goldschmidt 2016
  • Int'l Joint Research
• [Presentation] Bridgmanite Enriched Ancient Mantle Structures (BEAMS): A model to unify lower mantle geophysics, geochemistry, and geodynamics (2016)
  • Author(s): Houser, C., M.D. Ballmer, J.W. Hernlund
  • Organizer: Workshop on the Origin of Plate Tectonics 2016
  • Int'l Joint Research
• [Presentation] Bridgmanite Enriched Ancient Mantle Structures (BEAMS): A model to unify lower mantle geophysics, geochemistry, and geodynamics (2016)
  • 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
  • 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
• [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
• [Presentation] Finite frequency effects on apparent S-wave splitting in the lowermost mantle (2016)
  • Author(s): Borgeaud, A., K. Kawai, R. Geller, K. Konishi
  • Organizer: 日本地震学会2016秋季大会
• [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
• [Presentation] Full-waveform inversion for localized 3-D S-velocity structure in D” beneath the Caribbean using USArray data (2016)
  • 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
• [Presentation] Waveform inversion for 3-D shear wave velocity structure within D” beneath the Northern Pacific and Alaska (2016)
  • 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
• [Presentation] Estimate of subduction rate of island arcs to the deep mantle (2016)
  • 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
• [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
• [Presentation] Geoelectromagnetic jerks produced by heterogeneous electrical conductivity in the D" layer (2016)
  • Author(s): Shimizu, H., H. Utada
  • Organizer: 日本地球惑星科学連合2016年大会
• [Presentation] Inverse geodynamo modeling to construct geomagnetic field models and dynamo scaling-laws (2016)
  • 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
• [Presentation] Compatibility of an Observed Geoelectric Jerk With Field Variations Influenced by Highly Electrically Conducting LLSVP (2016)
  • Author(s): Shimizu, H., H. Utada
  • Organizer: アメリカ地球物理学連合2016年秋季大会
  • Int'l Joint Research
• [Presentation] Sensitivity of core phases to F-layer structure (2016)
  • Author(s): Ohtaki, T., S. Kaneshima
  • Organizer: 日本地球惑星科学連合2016年大会
• [Presentation] Seismological evidence for heterogeneous lowermost outer core of the Earth from PKiKP-PKPbc differential traveltime and dispersion in PKPbc (2016)
  • 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
  • Int'l Joint Research
• [Presentation] Relative Importance of Intrinsic and Scattering Attenuation in the Lower Mantle (2016)
  • Author(s): Takeuchi, N.
  • Organizer: 日本地球惑星科学連合2016年大会
• [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
• [Presentation] Towards local tomography models with uncertainties, International Workshop：Neutrino Research and Thermal Evolution of the Earth (2016)
  • Author(s): Takeuchi, N.
  • Organizer: International Workshop：Neutrino Research and Thermal Evolution of the Earth
  • Int'l Joint Research
• [Presentation] Array analyses of SmKS waves and the stratification of Earth’s outermost core (2016)
  • Author(s): Kaneshima S.
  • Organizer: 第15回地球深部研究国際シンポジウム
  • Int'l Joint Research
• [Presentation] SiO2 Saturation in the Outer Core (2016)
  • 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
  • Int'l Joint Research
• [Presentation] Outer Core Stratification by crystallization of SiO2 (2016)
  • 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
  • Int'l Joint Research
• [Presentation] A possible new host mineral of large-ion elements in the Earth’s deep interior (2015)
  • Author(s): Kawai, K. Tsuchiya, T.
  • Organizer: AGU2016
  • Place of Presentation: San Francisco (USA)
  • Year and Date: 2015-12-14
  • Int'l Joint Research
• [Presentation] Full-waveform Inversion for Localized 3-D S-velocity Structure in D" Beneath the Caribbean using US-Array Data (2015)
  • 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
  • Int'l Joint Research
• [Presentation] High-P,T Elasticity of Hcp Iron: Reinvestigation of the Applicability of Hcp Iron to the Earth’s Inner Core (2015)
  • 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
  • Int'l Joint Research
• [Presentation] Adjacent high- and low-velocity regions around the western edge pf the Pacific Large-Low Shear Velocity Province (2015)
  • 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
  • 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
  • Int'l Joint Research
• [Presentation] Full waveform inversion for 3D S-velocity structure in the D" region (2015)
  • 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
  • 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
• [Presentation] Waveform inversion for three-dimensional S-wave velocity structure in D" beneath the Caribbean (2015)
  • 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
• [Presentation] Temperature profile and chemical heterogeneity in the lowermost mantle from seismological and mineral physics joint modeling (2015)
  • 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
  • Int'l Joint Research / Invited
• [Presentation] Seismic Tomography by Statistical Approach (2015)
  • 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
  • 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
• [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
• [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
• [Presentation] Global tomography below and above the core-mantle boundary (2015)
  • 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
• [Presentation] Properties of the F layer at the base of the outer core (2015)
  • 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
• [Book] Deep Earth: Physics and Chemistry of the Lower Mantled Core (2016)
  • Author(s): Hidenori Terasaki, Rebecca A Fischer, George Helffrich
  • Total Pages: 312
  • Publisher: American Geophysical Union
• [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
• [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/