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Innovative four-dimensional variation method for data assimilation based on large-scale models

Research Project

Project/Area Number 17H01703
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Statistical science
Research InstitutionThe University of Tokyo

Principal Investigator

Nagao Hiromichi  東京大学, 地震研究所, 准教授 (80435833)

Co-Investigator(Kenkyū-buntansha) 堀 高峰  国立研究開発法人海洋研究開発機構, 海域地震火山部門(地震津波予測研究開発センター), センター長 (00359176)
中野 慎也  統計数理研究所, モデリング研究系, 准教授 (40378576)
伊藤 耕介  琉球大学, 理学部, 准教授 (10634123)
福田 淳一  東京大学, 地震研究所, 助教 (70569714)
永田 賢二  国立研究開発法人物質・材料研究機構, 統合型材料開発・情報基盤部門, 主任研究員 (10556062)
桑谷 立  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), 副主任研究員 (60646785)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥15,860,000 (Direct Cost: ¥12,200,000、Indirect Cost: ¥3,660,000)
Fiscal Year 2019: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2018: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2017: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Keywordsデータ同化 / 4次元変分法 / 最適化 / 不確実性評価 / 地震 / 時系列解析 / モデリング / Ginzburg-Landau方程式 / マルコフ連鎖モンテカルロ法 / 地震波 / 摩擦
Outline of Final Research Achievements

We have developed a prototype version of the next-generation four-dimensional variational method and implemented it in seismic wave propagation simulation code in 2D space. The twin experiments showed that the estimation of the optimum values and their uncertainty quantifications related to the physical property parameters in the underground structure. As a new target to implement our method, we have newly developed a numerical simulation code of the time-dependent Ginzburg-Landau equation that describes the spatiotemporal change of the magnetization pattern in the magnetic materials. These results were published in international journals and presented in domestic and international conferences.
The source code of the next-generation four-dimensional variational method developed in this research is currently being prepared for publication.

Academic Significance and Societal Importance of the Research Achievements

本研究で開発した次世代型4次元変分法により、従来型4次元変分法では不可能であった広域最適解探索と不確実性評価を一挙に解決することが可能となり、大規模数値モデルに基づくデータ同化の関連分野、特に気象予報業務や地震発生予測研究にとっては大きな転回点となるであろう。特に地震学においては、地震発生直後の迅速な地震波動場推定や、巨大地震発生メカニズムの理解に直結するプレート境界における断層すべりの時空間モデルの構築など、将来的に地震防災・減災に資する手法となる可能性が本研究によって拓かれた。

Report

(4 results)
  • 2020 Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (77 results)

All 2021 2020 2019 2018 2017 Other

All Journal Article (15 results) (of which Peer Reviewed: 14 results,  Open Access: 10 results) Presentation (58 results) (of which Int'l Joint Research: 30 results,  Invited: 20 results) Book (2 results) Remarks (2 results)

  • [Journal Article] Forecasting temporal variation of aftershocks immediately after a main shock using Gaussian process regression2021

    • Author(s)
      Morikawa, K., H. Nagao, S. Ito, Y. Terada, S. Sakai, and N. Hirata
    • Journal Title

      Geophysical Journal International

      Volume: - Issue: 2 Pages: 1018-1035

    • DOI

      10.1093/gji/ggab124

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Phase prediction method for pattern formation in time-dependent Ginzburg-Landau dynamics for kinetic Ising model without a priori assumptions of domain patterns2021

    • Author(s)
      Anzaki, R., S. Ito, H. Nagao, M. Mizumaki, M. Okada, and I. Akai
    • Journal Title

      Physical Review B

      Volume: 103 Issue: 9 Pages: 1-8

    • DOI

      10.1103/physrevb.103.094408

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development of Data-Driven System in Materials Integration2020

    • Author(s)
      Inoue, J., M. Okada, H. Nagao, H. Yokota, Y. Adachi
    • Journal Title

      MATERIALS TRANSACTIONS

      Volume: 61 Issue: 11 Pages: 2058-2066

    • DOI

      10.2320/matertrans.MT-MA2020006

    • NAID

      130007930270

    • ISSN
      1345-9678, 1347-5320
    • Year and Date
      2020-11-01
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Bayesian Spectral Deconvolution Based on Poisson Distribution: Bayesian Measurement and Virtual Measurement Analytics (VMA)2019

    • Author(s)
      Nagata K., R. Muraoka, Y. Mototake, T. Sasaki, and M. Okada
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 88 Issue: 4 Pages: 044003-044003

    • DOI

      10.7566/jpsj.88.044003

    • NAID

      40021866617

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] <b>Data-driven Analysis towards Understanding of Geoscience Processes: </b><b>Application Examples in Geology </b>2018

    • Author(s)
      桑谷立
    • Journal Title

      Geoinformatics

      Volume: 29 Issue: 2 Pages: 49-60

    • DOI

      10.6010/geoinformatics.29.2_49

    • NAID

      130007412277

    • ISSN
      0388-502X, 1347-541X
    • Year and Date
      2018-06-25
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Diffusion creep and grain growth in forsterite+ 20 vol% enstatite aggregates: 2. Their common diffusional mechanism and its consequence for weak‐temperature‐dependent viscosity.2018

    • Author(s)
      Nakakoji, T., & Hiraga, T.
    • Journal Title

      Journal of Geophysical Research

      Volume: 123 Issue: 11 Pages: 9513-9527

    • DOI

      10.1029/2018jb015818

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Recovering the past history of natural recording media by Bayesian inversion2018

    • Author(s)
      Kuwatani T, Nagao H, Ito SI, Okamoto A, Yoshida K Okudaira T
    • Journal Title

      Physical Review E

      Volume: 98 Issue: 4 Pages: 043311-043311

    • DOI

      10.1103/physreve.98.043311

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] P-cubed: Pythonによる並列計算機用粒子フィルタライブラリ2018

    • Author(s)
      中野 慎也, 有吉 雄哉, 樋口 知之
    • Journal Title

      統計数理

      Volume: 66 Pages: 339-351

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spatiotemporal Evolution of Recurrent Slow Slip Events Along the Southern Ryukyu Subduction Zone, Japan, From 2010 to 20132018

    • Author(s)
      Kano Masayuki、Fukuda Jun'ichi、Miyazaki Shin'ichi、Nakamura Mamoru
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 123 Issue: 8 Pages: 7090-7107

    • DOI

      10.1029/2018jb016072

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Bayesian probabilistic reconstruction of metamorphic <i>P</i>–<i>T</i> paths using inclusion geothermobarometry2018

    • Author(s)
      T. Kuwatani, K. Nagata, K. Yoshida, M. Okada, M. Toriumi
    • Journal Title

      Journal of Mineralogical and Petrological Sciences

      Volume: 113 Issue: 2 Pages: 82-95

    • DOI

      10.2465/jmps.170923

    • NAID

      130006733783

    • ISSN
      1345-6296, 1349-3825
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spectral Deconvolution through Bayesian LARS-OLS2018

    • Author(s)
      Mototake Y., Y. Igarashi, H. Takenaka, K. Nagata, and M. Okada
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 87 Issue: 11 Pages: 114004-114004

    • DOI

      10.7566/jpsj.87.114004

    • NAID

      210000135002

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Variability of the space-time evolution of slow slip events off the Boso Peninsula, central Japan, from 1996 to 20142018

    • Author(s)
      J. Fukuda
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 123 Issue: 1 Pages: 732-760

    • DOI

      10.1002/2017jb014709

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Information extraction from metamorphic rock textures and compositional zoning of minerals:2017

    • Author(s)
      Okamoto Atsushi、Kuwatani Tatsu
    • Journal Title

      The Journal of the Geological Society of Japan

      Volume: 123 Issue: 9 Pages: 733-745

    • DOI

      10.5575/geosoc.2017.0034

    • NAID

      130006279051

    • ISSN
      0016-7630, 1349-9963
    • Year and Date
      2017-09-15
    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Earthquake and Tsunami Scenarios as Basic Information to Prepare Next Nankai Megathrust Earthquakes2017

    • Author(s)
      T. Hori
    • Journal Title

      Journal of Disaster Research

      Volume: 12 Issue: 4 Pages: 775-781

    • DOI

      10.20965/jdr.2017.p0775

    • NAID

      130008128084

    • ISSN
      1881-2473, 1883-8030
    • Year and Date
      2017-08-01
    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 不確実性評価が可能な新しい4次元変分法2017

    • Author(s)
      長尾 大道, 伊藤 伸一
    • Journal Title

      地盤工学会誌

      Volume: 65 Pages: 2-5

    • Related Report
      2017 Annual Research Report
  • [Presentation] 時間依存Ginzburg-Landau方程式による2次元スピン系でのパターン形成に関する理論的研究2021

    • Author(s)
      安崎 遼路,伊藤 伸一,長尾 大道,水牧 仁一朗,岡田 真人,赤井 一郎
    • Organizer
      日本物理学会 第76回年次大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 双極子間相互作用を含む時間依存Ginzburg-Landau方程式によるパターン形成における相分類の提案と解析的な相予測2021

    • Author(s)
      安崎 遼路,伊藤 伸一,長尾 大道,水牧 仁一朗,岡田 真人,赤井 一郎
    • Organizer
      第68回 応用物理学会 春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Twin experiment of 4DVar capable of uncertainty quantification based on seismic wavefield propagation2020

    • Author(s)
      Nagao, H., S. Ito, M. Kano, and M. Matsumura
    • Organizer
      日本地球惑星科学連合2020年大会
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Decomposition of multiple seasonal components in a seasonal adjustment model2020

    • Author(s)
      Haba, T., H. Nagao, and S. Ito
    • Organizer
      Joint Statistical Meetings
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] データ同化によるフェーズフィールドモデリングの深化2020

    • Author(s)
      長尾 大道,伊藤 伸一,糟谷 正,井上 純哉
    • Organizer
      第33回 日本放射光学会年会・放射光科学合同シンポジウム
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 畳み込みニューラルネットワークに基づく地震波形画像からの深部低周波微動検出に向けた数値実験2020

    • Author(s)
      金子 亮介,長尾 大道,伊藤 伸一,小原 一成,鶴岡 弘
    • Organizer
      日本地震学会2020年度秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Uncertainty quantification for parameters and time series forecasting based on data assimilation2019

    • Author(s)
      Nagao, H. and S. Ito
    • Organizer
      12th International Conference on the ERCIM WG on Computational and Methodological Statistics (CMStatistics 2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Uncertainty quantification based on 4DVar data assimilation for massive simulation models2019

    • Author(s)
      Ito, S., M. Kano, and H. Nagao
    • Organizer
      11th International Workshop on Statistical Seismology (StatSei11)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Bayesian inference of grain growth prediction via multi-phase-field models2019

    • Author(s)
      Ito, S., Nagao, H., T. Kurokawa, T. Kasuya, and J. Inoue
    • Organizer
      16th Annual Meeting, Asia Oceania Geosciences Society (AOGS)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Decomposition of multiple seasonal components in a seasonal adjustment model2019

    • Author(s)
      Haba, T., H. Nagao, and S. Ito
    • Organizer
      16th Annual Meeting, Asia Oceania Geosciences Society (AOGS)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Bayesian inference for phase-field models with non-time-series data2019

    • Author(s)
      Nagao, H. and S. Ito
    • Organizer
      27th International Union of Geodesy and Geophysics (IUGG) General Assembly
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Bayesian inference of grain growth prediction via multi-phase-field models2019

    • Author(s)
      Nagao, H., S. Ito, T. Kurokawa, T. Kasuya, and J. Inoue
    • Organizer
      European Geosciences Union (EGU) General Assembly
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Uncertainty quantification for inhomogeneous frictional features in a slow-slipping fault based on a large-scale four-dimensional variational data assimilation2019

    • Author(s)
      Ito, S., M. Kano, and Nagao, H.
    • Organizer
      American Geophysical Union (AGU) Fall Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Implementation of replica exchange Monte Carlo on 4DVar for global optimization2019

    • Author(s)
      Nagao, H., S. Ito, K. Hasegawa, M. Kano, M. Okada, H. Hino, K. Nagata, and N. Hirata
    • Organizer
      American Geophysical Union (AGU) Fall Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Bayesian inference of grain growth prediction via multi-phase-field models2019

    • Author(s)
      Ito, S., Nagao, H., T. Kurokawa, T. Kasuya, and J. Inoue
    • Organizer
      NIMS WEEK 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Uncertainty quantification based on 4DVar data assimilation for massive simulation models2019

    • Author(s)
      Ito, S. and H. Nagao
    • Organizer
      Frontiers of Statistical Physics (FSP2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 4次元変分法データ同化の新展開2019

    • Author(s)
      長尾 大道,伊藤 伸一,長谷川 慶
    • Organizer
      統計関連学会連合大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Uncertainty quantification based on 4DVar data assimilation for massive simulation models2019

    • Author(s)
      Ito, S., M. Kano, and Nagao, H.
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 大規模4次元変分法データ同化に基づくスロースリップ断層面における摩擦特性不均一性の不確実性評価2019

    • Author(s)
      伊藤 伸一,加納 将行,長尾 大道
    • Organizer
      日本地震学会2019年度秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Bayesian inference of grain growth prediction via multi-phase-field models2019

    • Author(s)
      Ito, S., Nagao, H., T. Kurokawa, T. Kasuya, and J. Inoue
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Data assimilation for grain growth prediction via multi-phase-field models2019

    • Author(s)
      Nagao, H., S. Ito, T. Kasuya, and J. Inoue
    • Organizer
      The International Conference on Computational & Experimental Engineering and Sciences
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Bayesian inference of grain growth prediction via multi-phase-field models2019

    • Author(s)
      Nagao, H., S. Ito, T. Kurokawa, T. Kasuya, and J. Inoue
    • Organizer
      American Physical Society March Meeting 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Seismic wavefield imaging of long-period ground motion in the Tokyo Metropolitan area, Japan2019

    • Author(s)
      Nagao, H., M. Kano, K. Nagata, S. Ito, S. Sakai, S. Nakagawa, M. Hori, and N. Hirata
    • Organizer
      International Conference on Mathematical Modeling and Applications
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] フェーズフィールド法に基づくデータ同化モデリング2019

    • Author(s)
      長尾 大道
    • Organizer
      第2回計測インフォマティクス研究会(人工知能学会第2種研究会)
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] 4次元変分法データ同化2019

    • Author(s)
      長尾 大道
    • Organizer
      第20回 京都大学 情報学シンポジウム「数理・計算科学の挑戦」
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] フェーズフィールド法に基づくデータ同化研究の最前線2019

    • Author(s)
      長尾 大道
    • Organizer
      第7回材料系ワークショップ
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] 4DEnVar with Iterative Calculation of Nonlinear Nonhydrostatic Model Compared to En4DVar2019

    • Author(s)
      Yokota, S., K. Koizumi, M. Kunii, and K. Ito
    • Organizer
      The 7th International Symposium on Data Assimilation 2019
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 線形データ同化の基礎2019

    • Author(s)
      伊藤 耕介
    • Organizer
      固体地球科学データ同化に関する研究会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 物理モデルと観測データとの融合による地震波動場推定法2018

    • Author(s)
      長尾 大道
    • Organizer
      大阪大学 数理・データ科学教育研究センターセミナー
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] 情報計測の高度化に向けた統計的・機械学習的アプローチの今後の展望2018

    • Author(s)
      長尾 大道, 日野 英逸
    • Organizer
      2018年度 統計関連学会連合大会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] 計測と計算を融合するデータ同化の地震ビッグデータへの応用2018

    • Author(s)
      長尾 大道
    • Organizer
      公開シンポジウム 「新たな発見をもたらす科学における計測と予知・予測」
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] データ同化:大規模モデルと大容量データの融合2018

    • Author(s)
      長尾 大道
    • Organizer
      ポスト「京」重点課題(7) 研究集会「データ駆動科学と高速計算科学」
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] 4次元変分法データ同化の数理2018

    • Author(s)
      長尾 大道, 伊藤 伸一
    • Organizer
      第2回RCMSサロン
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] 4DEnVar with Iterative Calculation of Nonlinear Nonhydrostatic Model Compared to En4DVar2018

    • Author(s)
      Yokota, S., K. Koizumi, M. Kunii, and K. Ito
    • Organizer
      The 5th International Workshop on Nonhydrostatic Models
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 現業メソ同化システムを用いた4DVar, En4DVar, 4DEnVarの比較2018

    • Author(s)
      横田 祥, 小泉 耕, 国井 勝, 伊藤 耕介
    • Organizer
      日本気象学会秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Fluid model based image data analysis and data assimilation2018

    • Author(s)
      Nakano, S.
    • Organizer
      NTNU-ISM Joint Workshop on Sustainability and Statistical Machine Learning
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A non-parametric regression model for analysis of spherical vector fields and its application to ionospheric HF radar data2018

    • Author(s)
      中野 慎也, 堀 智昭, 関 華奈子, 西谷 望
    • Organizer
      2018年度 統計関連学会連合大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] On marginal likelihood estimation methods in ensemble-based data assimilation2018

    • Author(s)
      Nakano, S.
    • Organizer
      9th Japanese Data Assimilation Workshop
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Coupled frictional afterslip and viscoelastic relaxation following the 2011 Tohoku-oki earthquake2018

    • Author(s)
      Fukuda, J. and K. M. Johnson
    • Organizer
      American Geophysical Union Fall Meeting 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development of Monitoring and Forecasting Methods for Crustal Activity Utilizing Large-Scale High-Fidelity Finite Element Simulations with 3D Heterogeneous Medium2018

    • Author(s)
      Hori, T., T. Ichimura, K. Fujita, T. Yamaguchi, R. Agata, and T. Iinuma
    • Organizer
      American Geophysical Union Fall Meeting 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Pressure-Temperature-Time Path Inversion from Zoned Minerals Using Data Assimilation2018

    • Author(s)
      Kuwatani, T., H. Nagao, A. Okamoto, K. Yoshida, S. Ito, and T. Okudaira
    • Organizer
      Asia Oceania Geoscience Society 15th Annual Meeting
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 数理情報科学による地球科学逆問題への挑戦2018

    • Author(s)
      桑谷 立
    • Organizer
      第21回 情報論的学習理論ワークショップ (IBIS2018)
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] 4次元変分法データ同化のための不確実性評価法2018

    • Author(s)
      長尾 大道, 伊藤 伸一
    • Organizer
      第12回 日本統計学会春季集会
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] Pythonによる並列計算用粒子フィルタライブラリ開発2018

    • Author(s)
      中野 慎也, 有吉 雄哉, 樋口 知之
    • Organizer
      第8回データ同化ワークショップ
    • Related Report
      2017 Annual Research Report
  • [Presentation] Data assimilation for massive autonomous systems based on a second-order adjoint method2017

    • Author(s)
      H. Nagao and S. Ito
    • Organizer
      Taiwan-Japan Joint Workshop on Inverse Problems in Kanazawa 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Data assimilation for massive autonomous systems based on a second-order adjoint method2017

    • Author(s)
      H. Nagao and S. Ito
    • Organizer
      Asia Oceania Geoscience Society Annual Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Uncertainty quantification for massive autonomous systems based on a second-order adjoint method2017

    • Author(s)
      S. Ito, H. Nagao, and M. Kano
    • Organizer
      European Geosciences Union General Assembly 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] フェーズフィールド法への4次元変分法データ同化の展開2017

    • Author(s)
      長尾 大道
    • Organizer
      第9回 自動チューニング技術の現状と応用に関するシンポジウム
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] Use of kernel regression in ensemble Kalman filters2017

    • Author(s)
      中野 慎也
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] データ同化手法とその考え方2017

    • Author(s)
      中野 慎也
    • Organizer
      FAMCOワークショップ2017
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] Extraction of geophysical information from auroral movies using an approximate Kalman filter2017

    • Author(s)
      S. Nakano and Y. Ogawa
    • Organizer
      2nd ISM-ZIB-IMI MODAL Workshop on Mathematical Optimization and Data Analysis
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Various aspects of data assimilation techniques and expansion of their applications2017

    • Author(s)
      S. Nakano
    • Organizer
      The 8th Symposium on Polar Science
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 物理モデルと測地データに基づく地殻変動のモデリング2017

    • Author(s)
      福田 淳一
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] A coupled model of stress-driven frictional afterslip and viscoelastic relaxation following the 2011 Tohoku-oki earthquake2017

    • Author(s)
      J. Fukuda
    • Organizer
      American Geophysical Union Fall Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 地球科学におけるデータ駆動型解析2017

    • Author(s)
      桑谷 立
    • Organizer
      日本情報地質学会・地質情報整備活用機構共催シンポジウム
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] 岩石学分野におけるデータ駆動型解析の現状と展望2017

    • Author(s)
      桑谷 立
    • Organizer
      日本地質学会 第124年学術大会(2017愛媛大会)
    • Related Report
      2017 Annual Research Report
  • [Presentation] アンサンブル手法を用いた観測感度2017

    • Author(s)
      伊藤 耕介
    • Organizer
      第3回アンサンブル同化摂動に関する研究会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Spectral deconvolution and Bayesian estimation2017

    • Author(s)
      K. Nagata
    • Organizer
      5th International Symposium on Kumamoto Synchrotron Radiation (ISKSR5): Progress of Data Analysis, Data-Driven Science, and Theory for Science
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Book] Active Geophysical Monitoring (2nd Edition)2019

    • Author(s)
      Junzo Kasahara, Michael S. Zhdanov, Hitoshi Mikada(編), Hiromichi Nagao(分担執筆)
    • Total Pages
      646
    • Publisher
      Elsevier
    • ISBN
      9780081026847
    • Related Report
      2019 Annual Research Report
  • [Book] 岩波データサイエンス Vol. 62017

    • Author(s)
      樋口 知之, 伊藤 耕介, 伊庭 幸人, 仙石 裕明
    • Total Pages
      152
    • Publisher
      岩波書店
    • ISBN
      4000298569
    • Related Report
      2017 Annual Research Report
  • [Remarks] 東京大学地震研究所 長尾・伊藤研究室

    • URL

      https://www.eri.u-tokyo.ac.jp/people/nagaoh/

    • Related Report
      2019 Annual Research Report
  • [Remarks] 東京大学地震研究所 長尾大道研究室

    • URL

      http://www.eri.u-tokyo.ac.jp/people/nagaoh/

    • Related Report
      2017 Annual Research Report

URL: 

Published: 2017-04-28   Modified: 2022-01-27  

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