Researcher Information
researchmap URL
Degree
Research History
- Oct. 2025 - Present
Japan Agency for Marine-Earth Science and Technology, Research Institute for Marine Geodynamics, Researcher - Apr. 2020 - Sep. 2025
Japan Agency for Marine-Earth Science and Technology, Research Institute for Marine Geodynamics, Researcher - Apr. 2017 - Mar. 2020
Japan Agency for Marine-Earth Science and Technology, Postdoctoral researcher - Oct. 2016 - Mar. 2017
Japan Society for the Promotion of Science, Research Fellowships for Young Scientists (PD) - Apr. 2014 - Sep. 2016
Japan Society for the Promotion of Science, Research Fellowships for Young Scientists (DC1)
Education
- Oct. 2013 - Sep. 2016, The University of Tokyo, The Graduate School of Engineering, Department of Civil Engineering
- Apr. 2012 - Sep. 2013, The University of Tokyo, The Graduate School of Engineering, Department of Civil Engineering
- Apr. 2008 - Mar. 2012, The University of Tokyo, The Faculty of Engineering, Department of Civil Engineering
Research activity information
Papers
- Ryoichiro Agata; Satoru Baba; Ayako Nakanishi; Yasuyuki Nakamura
HypoNet Nankai: Rapid Hypocenter Determination Tool for the Nankai Trough Subduction Zone Using Physics-Informed Neural Networks
Seismological Research Letters, 07 Aug. 2025
[Reviewed]
Lead, Corresponding - Ryoichiro Agata
Application of Scientific Machine Learning (SciML) in Earthquake Research
Artificial Intelligence and Data Science, May 2025
6, 1, 1, 13
Lead, Last, Corresponding - Ryoichiro Agata
Quantification of Uncertainty and Its Propagation in Seismic Velocity Structure and Earthquake Source Inversion
Journal of the Seismological Society of Japan. 2nd ser., 10 Mar. 2025
77, 12
[Reviewed], [Invited]
Lead, Corresponding - Ryoichiro Agata; Kazuya Shiraishi; Gou Fujie
Physics-informed deep learning quantifies propagated uncertainty in seismic structure and hypocenter determination
Scientific Reports, 13 Jan. 2025
15, 1
[Reviewed]
Lead, Corresponding - Ryoichiro Agata; Kazuya Shiraishi; Gou Fujie
Bayesian Seismic Tomography Based on Velocity-Space Stein Variational Gradient Descent for Physics-Informed Neural Network
IEEE Transactions on Geoscience and Remote Sensing, 2023
61, 1, 17
[Reviewed]
Lead, Corresponding - R. Agata; R. Nakata; A. Kasahara; Y. Yagi; Y. Seshimo; S. Yoshioka; T. Iinuma
Bayesian Multi‐Model Estimation of Fault Slip Distribution for Slow Slip Events in Southwest Japan: Effects of Prior Constraints and Uncertain Underground Structure
Journal of Geophysical Research: Solid Earth, 27 Aug. 2022
127, 8
[Reviewed]
Lead, Corresponding - Shinji Yamashita; Yagi Yuji; Ryo Okuwaki; Kousuke Shimizu; Ryoichiro Agata; Yukitoshi Fukahata
Potency density tensor inversion of complex body waveforms with time-adaptive smoothing constraint
28 Oct. 2021
[Reviewed] - Ryoichiro Agata; Amato Kasahara; Yuji Yagi
A Bayesian inference framework for fault slip distributions based on ensemble modelling of the uncertainty of underground structure: with a focus on uncertain fault dip
GEOPHYSICAL JOURNAL INTERNATIONAL, May 2021
225, 2, 1392, 1411
[Reviewed]
Lead, Corresponding - Fumiaki Tomita; Takeshi Iinuma; Ryoichiro Agata; Takane Hori
Development of a Trans‐Dimensional Fault Slip Inversion for Geodetic Data
Journal of Geophysical Research: Solid Earth, May 2021
126, 5
[Reviewed] - Shinji Yamashita; Yuji Yagi; Ryo Okuwaki; Kousuke Shimizu; Ryoichiro Agata; Yukitoshi Fukahata
Consecutive ruptures on a complex conjugate fault system during the 2018 Gulf of Alaska earthquake
SCIENTIFIC REPORTS, Mar. 2021
11, 1
[Reviewed] - Takane Hori; Ryoichiro Agata; Tsuyoshi Ichimura; Kohei Fujita; Takuma Yamaguchi; Takeshi Iinuma
High-fidelity elastic Green's functions for subduction zone models consistent with the global standard geodetic reference system
EARTH PLANETS AND SPACE, Feb. 2021
73, 1
[Reviewed] - Masaru Nakano; Shane Murphy; Ryoichiro Agata; Yasuhiko Igarashi; Masato Okada; Takane Hori
Self-similar stochastic slip distributions on a non-planar fault for tsunami scenarios for megathrust earthquakes
PROGRESS IN EARTH AND PLANETARY SCIENCE, Aug. 2020
7, 1
[Reviewed] - Ryoichiro Agata
Introduction of covariance components in slip inversion of geodetic data following a non-uniform spatial distribution and application to slip deficit rate estimation in the Nankai Trough subduction zone
Geophysical Journal International, 01 Jun. 2020
221, 3, 1832, 1844
[Reviewed]
Lead, Corresponding - Ryoichiro Agata; Takane Hori; Keisuke Ariyoshi; Tsuyoshi Ichimura
Detectability analysis of interplate fault slips in the Nankai subduction thrust using seafloor observation instruments
MARINE GEOPHYSICAL RESEARCH, Dec. 2019
40, 4, 453, 466
[Reviewed]
Lead, Corresponding - Ryoichiro Agata; Sylvain D. Barbot; Kohei Fujita; Mamoru Hyodo; Takeshi Iinuma; Ryoko Nakata; Tsuyoshi Ichimura; Takane Hori
Rapid mantle flow with power-law creep explains deformation after the 2011 Tohoku mega-quake
Nature Communications, Mar. 2019
10, 1, 1385
[Reviewed]
Lead, Corresponding - Tsuyoshi Ichimura; Ryoichiro Agata; Takane Hori; Kenji Satake; Kazuto Ando; Toshitaka Baba; Mueno Hori
Tsunami Analysis Method with High-Fidelity Crustal Structure and Geometry Model
JOURNAL OF EARTHQUAKE AND TSUNAMI, Dec. 2017
11, 5, 1750018, 1750018
[Reviewed] - Ryoichiro Agata; Tsuyoshi Ichimura; Takane Hori; Kazuro Hirahara; Chihiro Hashimoto; Muneo Hori
An adjoint-based simultaneous estimation method of the asthenosphere's viscosity and afterslip using a fast and scalable finite element adjoint solver
Geophysical Journal International, Dec. 2017
213, 1, 461, 474
[Reviewed]
Lead, Corresponding - Takuma Yamaguchi; Tsuyoshi Ichimura; Yuji Yagi; Ryoichiro Agata; Takane Hori; Muneo Hori
Fast crustal deformation computing method for multiple computations accelerated by a graphics processing unit cluster
GEOPHYSICAL JOURNAL INTERNATIONAL, Aug. 2017
210, 2, 787, 800
[Reviewed] - YAMAGUCHI Takuma; AGATA Ryoichiro; ICHIMURA Tsuyoshi; HORI Muneo; WIJERATHNE Lalith
A MONTE CARLO ANALYSIS METHOD OF CRUSTAL DEFORMATION COMPUTATION ON GPU CLUSTERS
Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)), 2017
73, 4, I_310, I_320
[Reviewed] - Tsuyoshi Ichimura; Ryoichiro Agata; Takane Hori; Kazuro Hirahara; Chihiro Hashimoto; Muneo Hori; Yukitoshi Fukahata
An elastic/viscoelastic finite element analysis method for crustal deformation using a 3-D island-scale high-fidelity model
GEOPHYSICAL JOURNAL INTERNATIONAL, Jul. 2016
206, 1, 114, 129
[Reviewed] - Agata Ryoichiro; Ichimura Tsuyoshi; Hirahara Kazuro; Hyodo Mamoru; Hori Takane; Hori Muneo
Robust and portable capacity computing method for many finite element analyses of a high-fidelity crustal structure model aimed for coseismic slip estimation
Computers & Geosciences, 2016
94, 121, 130
[Reviewed]
Lead, Corresponding - Ryoichiro Agata; Tsuyoshi Ichimura; Kazuro Hirahara; Mamoru Hyodo; Takane Hori; Chihiro Hashimoto; Muneo Hori
Numerical verification criteria for coseismic and postseismic crustal deformation analysis with large-scale high-fidelity model
INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE, 2015
51, 1534, 1544
[Reviewed]
Lead, Corresponding - Ryoichiro Agata; Tsuyoshi Ichimura; Kazuro Hirahara; Mamoru Hyodo; Takane Hori; Muneo Hori
Several hundred finite element analyses of an inversion of earthquake fault slip distribution using a high-fidelity model of the crustal structure
2014 INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, 2014
29, 877, 887
[Reviewed]
Lead, Corresponding - Tsuyoshi Ichimura; Ryoichiro Agata; Takane Hori; Kazuro Hirahara; Muneo Hori
Fast numerical simulation of crustal deformation using a three-dimensional high-fidelity model
GEOPHYSICAL JOURNAL INTERNATIONAL, Dec. 2013
195, 3, 1730, 1744
[Reviewed] - Agata Ryoichiro; Ichimura Tsuyoshi; Hirahara Kazuro; Hyodo Mamoru; Hori Takene; Hashimoto Chihiro; Hori Muneo
Fundamental Research for Improving Fault Scenario --Development of a Method for Crustal Deformation Analysis Using High--Fidelity Three--Dimensional Crustal Structure--(in Japanese with English abstract)
Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)), 2013
69, 6343, I\_767
[Reviewed]
Lead, Corresponding
Misc.
- Satoru Baba; Eiichiro Araki; Akiko Toh; Ryoichiro Agata; Ayako Nakanishi
Construction of an automatic hypocenter location system using offshore seismic network and distributed acoustic sensing data using submarine cables
IEEE International Symposium on Underwater Technology, Mar. 2025
[Reviewed] - 飯沼卓史; 荒木英一郎; 縣亮一郎; 山本揚二郎; 木村俊則; 町田祐弥; 有吉慶介; 市村強; 堀高峰; 小平秀一
Spatio-temporal evolution of the slow slip event in Kumano-nada occurred during December 2020 to January 2021
日本地震学会秋季大会講演予稿集(CD-ROM), 2021
2021 - 仲矢直樹; 浅井光輝; 縣亮一郎; 堀高峰; 馬場俊孝
Tsunami Run-up Simulation Based on Crustal Deformation Simulation by BEM
計算工学講演会論文集(CD-ROM), Jun. 2018
23, 4p - 山口拓真; 縣亮一郎; 市村強; 堀宗朗; WIJERATHNE M. L. L.
GPUクラスタを用いたモンテカルロシミュレーションによる地殻変動被害予測
土木学会年次学術講演会講演概要集(CD-ROM), 2016
71st - 縣亮一郎; 市村強; 堀高峰; 平原和朗; 橋本千尋; 堀宗朗
余効変動の大規模有限要素シミュレーションを用いた断層すべり量とアセノフェア粘性率同時推定手法の開発
日本地球惑星科学連合大会予稿集(Web), 2016
2016 - 縣亮一郎; 市村強; 平原和朗; 兵藤守; 中野優; 堀高峰; 堀宗朗
高詳細な地殻変動シミュレーションを用いた津波波高推定手法の基礎的検討
土木学会年次学術講演会講演概要集(CD-ROM), 2015
70th - 縣亮一郎; 市村強; 堀高峰; 平原和朗; 橋本千尋; 堀宗朗
余効変動の高詳細有限要素シミュレーションを用いたアセノスフェア粘性率・断層すべり同時推定手法の開発
日本地震学会秋季大会講演予稿集, 2015
2015 - 縣亮一郎; 縣亮一郎; 市村強; 平原和朗; 兵藤守; 堀高峰; 堀宗朗
地殻構造の高詳細な有限要素モデルを用いた震源断層すべりによる海底面鉛直変位推定手法について
日本地震工学シンポジウム論文集(CD-ROM), 2014
14th - 縣亮一郎; 市村強; 兵藤守; 堀高峰; 平原和朗; 堀宗朗
震源断層モデル高度化のための基礎研究-高詳細な三次元地殻構造モデルを用いた震源断層すべりの推定-
土木学会年次学術講演会講演概要集(CD-ROM), 2013
68th - 縣亮一郎; 市村強; 平原和朗; 堀高峰; 兵藤守; 堀宗朗
震源断層シナリオ設定手法高度化のための基礎研究-高詳細な地殻モデルを用いた地震時断層変位推定手法の開発
日本地震工学会年次大会梗概集(CD-ROM), 2013
10th - 縣亮一郎; 市村強; 兵藤守; 堀高峰; 平原和朗; 堀宗朗
高詳細な三次元モデルを用いた高速な地殻変形解析手法の開発とその東北地方太平洋沖地震断層すべり推定への適用
計算工学講演会論文集(CD-ROM), 2013
18 - Agata Ryoichiro; Ichimura Tsuyoshi; Hyodo Mamoru; Hori Takane; Hirahara Kazuro; Hori Muneo
Development of a Method for Crustal Deformation Analysis Using High-fidelity Three-dimensional Crustal Structure Model and its application to estimation of coseismic fault slips
NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan, 2013
62, 0
Books and Other Publications
- Takane Hori; Ryoichiro Agata, Joint work, Chapter 1: Earthquake Generation Cycle and Crust Deformation in Subduction Zones
Application of high-performance computing to earthquake-related problems
World Scientific, Jul. 2024
9781800614628
Presentations
- Ayako Nakanishi; Yanfang Qin; Xin Liu; Ryoichiro Agata; Toshiya Fujiwara; Dan Basse; Gou Fujie; Katsuhiko Shiomi; Shuichi Kodaira; Narumi Takahashi; Takeshi Nakamura
Merging multi-scale structure models around the Nankai Trough subduction seismogenic zone towards completing a future 3D community model
JpGU2025, 29 May 2025 - Ryoichiro Agata; Kazuya Shiraishi; Gou Fujie
Bayesian multi-source seismic tomography using active- and passive-source seismic data based on physics-informed neural network
JpGU2025, 26 May 2025 - Tomohisa Okazaki; Ryoichiro Agata; Masayuki Kano; Daisuke Sato; Masayoshi Someya; Rikuto Fukushima
Neural Operators for Earthquake Cycle Simulation and Long-Period Ground Motion Forecast
JpGU2025, 26 May 2025 - Ryoichiro Agata; Satoru Baba; Ayako Nakanishi; Yasuyuki Nakamura
Rapid hypocenter determination tool for the Nankai Trough subduction zone based on physics-informed neural networks
AGU Fall Meeting 2024, 09 Dec. 2024 - 縣亮一郎
地震学研究におけるScientific machine learning（SciML）の活用
土木学会応用力学委員会 第一回応用数理・AIセミナー, 18 Nov. 2024, [Invited] - 縣亮一郎; 馬場慧; 仲西理子; 中村恭之
HypoNet Nankai: Rapid hypocenter determination tool for the Nankai Trough subduction zone using physics-informed neural networks
日本地震学会2024年度秋季大会, 22 Oct. 2024 - 仲西 理子; Qin Yanfang; Liu Xin; 縣 亮一郎; 富士原 敏也; 藤江 剛; 汐見 勝彦; 小平 秀一; 高橋 成実; 中村 武史
南海トラフ域の海陸統合３次元マルチパラメータ地下構造の構築と検証
日本地震学会2024年度秋季大会, 21 Oct. 2024 - 馬場慧; 荒木英一郎; 藤亜希子; 縣亮一郎; 仲西理子
DONETと分布型音響センシングのデータを用いた南海トラフにおける地震・スロー地震の自動解析
日本地震学会2024年度秋季大会, 21 Oct. 2024 - Ryoichiro AGATA
Studies focusing on heterogeneity and uncertainty of subsurface structures through computational science and Bayesian methods
日本地震学会2024年度秋季大会, 21 Oct. 2024, [Invited] - Satoru Baba; Eiichiro Araki; Akiko Toh; Ryoichiro Agata
Monitoring of fast and slow earthquakes using DONET and distributed acoustic sensing data in the Nankai Trough, southwest Japan
International Joint Workshop on Slow-to-Fast Earthquakes, 18 Sep. 2024 - Ryoichiro Agata; Satoru Baba; Ayako Nakanishi; Yasuyuki Nakamura
Rapid hypocenter determination tool for the Nankai Trough subduction zone based on fast travel time calculation using physics-informed neural networks
International Joint Workshop on Slow-to-Fast Earthquakes 2024, 17 Sep. 2024 - 縣亮一郎; 白石和也; 藤江剛
海域地震探査データを用いた地震波速度構造推定のBayesian physics-informed neural network による不確実性定量化
2024年度統計関連学会連合大会, 04 Sep. 2024, [Invited] - 日吉 善久; 山本; 優; 西本; 昌 縣; 亮一郎; 廣部; 紗也子; 堀 高峰
千島海溝沿いの巨大地震の震源の不確実性に基づく広域長周期地震動評価
2024年度日本建築学会大会（関東）, 29 Aug. 2024 - 山本 優; 内山 泰生; 西本 昌; 日吉 善久; 縣 亮一郎; 廣部 紗也子; 堀 高峰
令和6年能登半島地震による関東平野への長周期地震動
2024年度日本建築学会大会（関東）, 29 Aug. 2024 - Ryoichiro Agata; Satoru Baba; Ayako Nakanishi; Yasuyuki Nakamura
Rapid hypocenter determination tool for the Nankai Trough subduction zone using physics-informed neural networks
Source Inversion Workshop 2024, 25 Jul. 2024 - Ryoichiro Agata; Satoru Baba; Ayako Nakanishi; Yasuyuki Nakamura
Physics-informed neural network for travel time prediction for 3D velocity structure model in Nankai Trough
JpGU2024, 28 May 2024 - Ryoichiro Agata
Uncertainty quantification of seismic tomography based on Physics-informed neural networks and particle-based variational inference in function space
The 2022 SSJ Fall meeting, 25 Oct. 2022, [Invited] - Ryoichiro Agata; Ryoko Nakata; Amato Kasahara; Yuji Yagi; Yukinari Seshimo; Shoichir Yoshioka; Takeshi Iinuma
Bayesian multi-model fault slip estimation considering the uncertainty of underground structure
JpGU2022, 24 May 2022, [Invited] - R. Agata; T. Ichimura; T. Hori; K. Hirahara; C. Hashimoto; M. Hori
An adjoint-based simultaneous estimation method of the upper mantle viscosity and afterslip using finite element modeling
AOGS 16th Annual Meeting, 02 Aug. 2019 - 縣亮一郎; 堀高峰; 藤田航平; 市村強
弾性不均質構造・粘弾性の影響を考慮した地震サイクルの数値シミュレーション
第24回計算工学講演会, 29 May 2019 - 縣亮一郎; 市村強; 藤田航平; 山口拓真; 飯沼卓史; 堀高峰
統合的な速度構造モデルに基づいた断層すべり推定のためのグリーン関数ライブラリ生成
日本地球惑星科学連合2019年大会, 26 May 2019 - Ryoichiro Agata; Takane Hori; Kohei Fujita; Hyodo Mamoru; Tsuyoshi Ichimura
Quasi-static slow-slip cycle simulation based on finite element modeling
American Geophysical Union Fall Meeting 2018, Dec. 2018 - 縣亮一郎; 堀高峰; 藤田航平; 兵藤守; 市村強
有限要素計算を用いた豊後水道の長期的スロースリップサイクルシミュレーション
地震学会2018年度秋季大会, Dec. 2018 - Ryoichiro Agata; Sylvain D. Barbot; Kohei Fujita; Mamoru Hyodo; Takeshi Iinuma; Ryoko Nakata; Tsuyoshi Ichimura; Takane Hori
Numerical simulation of crustal deformation after an M9-class earthquake based on nonlinear viscoelastic finite element modeling
CoMFoS (Continuum Mechanics Focusing on Singularities) 2018, Jun. 2018, [Invited] - 縣亮一郎; Sylvain Barbot; 藤田航平; 兵藤守; 中田令子; 飯沼卓史; 市村強; 堀高峰
大規模非線形粘弾性有限要素計算に基づいた地震サイクルシミュレーション
第23回計算工学講演会, Jun. 2018 - Ryoichiro Agata; Tsuyoshi Ichimura; Takane Hori
Toward tsunami damage prediction based on high performance computing
日本地球惑星科学連合2018年大会, May 2018 - Ryoichiro Agata; Sylvain D. Barbot; Kohei Fujita; Mamoru Hyodo; Takeshi Iinuma; Ryoko Nakata; Tsuyoshi Ichimura; Takane Hori
The role of the power-law viscoelastic flow and fault friction and in post-earthquake deformation after the 2011 Tohoku-Oki earthquake
日本地球惑星科学連合2018年大会, May 2018 - 縣亮一郎
粘弾性変形の大規模有限要素解析を用いた地殻構造最適化手法の開発
日本応用数理学会研究部会「数理設計」第１８回研究集会, 06 Dec. 2016, [Invited]
Media Coverage
- 南海トラフ震源、ＡＩで「誤差数キロ」まで迅速に推定…津波の高さ・到達時間など予測精度向上へ
読売新聞, https://www.yomiuri.co.jp/science/20250104-OYT1T50067/, 04 Jan. 2025, Paper
JAMSTEC-Researcher Registration
