Basic Information

Email Address

• Email Address

  hayashi.koichi.4xkyoto-u.ac.jp

Academic Degree

• 15 Sep. 1999

  マサチューセッツ工科大学修士（理学）
• 24 Mar. 2008

  京都大学博士（工学）

Academic Resume (Undergraduate School/Majors)

• 千葉大学, 理学部地学科, 卒業

Research History

• From Mar. 2024, To Present

  Kyoto University, Disaster Prevention Research Institute, Professor
• From Nov. 2010, To Feb. 2024

  Oyo Corporation, 海外分室
• From Sep. 1999, To Oct. 2010

  Oyo Corporation, Technology and Engineering Center, Senior resarcher
• From Sep. 1997, To Aug. 1999

  Oyo Corporation, ボストン事務所
• From Apr. 1990, To Aug. 1997

  Oyo Corporation, 探査工学研究所, 技師

Profile

• Profile

  Dr. Koichi Hayashi is presently a Professor at Disaster Prevention Research Institute, Kyoto University in Uji, Kyoto, Japan. Over the past 33 years, he has worked as a research geophysicist focusing on providing better tools and algorithms for near-surface geophysical methods. He earned a B.S. degree in Earth Sciences from Chiba University in Japan, a M.S. degree in Earth Sciences from the Massachusetts Institute of Technology, and a Ph.D. in Earth Resources Engineering from Kyoto University in Japan. His main research areas are seismic refraction, active and passive surface waves, finite-difference seismic modeling, distributed acoustic sensing, machine learning and traveltime inversion. He is the author of the SeisImager data analysis suite of programs and has incorporated many of his theoretical developments into the software, making SeisImager one of the premier active and passive surface waves, refraction, and downhole data processing packages available today. He regularly presents papers at the major meetings, publishes in journals of SEG, SEGJ, EEGS, EAGE and SSA, and serves on scientific commissions. In 2014, he was selected as the SEG Near-Surface Honorary Lecturer, with his talk entitled “Integrated Geophysical Methods Applied to Geotechnical and Geohazard Engineering: From Qualitative to Quantitative Analysis and Interpretation”. Most recently, he was a contributing author to the textbook entitled “Seismic Ambient Noise”. He is currently in charge of a lecturer for a SEG training course “Passive Surface Wave Methods Using Ambient Noise: from Basic 1D Soundings to High-resolution 3D Imaging”.

ID,URL

• ORCID ID

  0000-0001-5064-8874

• J-Global ID

  202401001331918581

• Researcher number

  10513492

• External link

  https://seisimager.com/

researchmap URL

• https://researchmap.jp/koichi-hayashi

Research

Research Topics, Overview of the research

• Research Topics

  Development of geophysical methods, particularly seismic methods and their application to site investigations, and software development

• Overview of the research

  Dr. Koichi Hayashi is presently a Professor at Kyoto University. Over the past 33 years, he has worked as a research geophysicist. He earned a M.S. degree in Earth Sciences from the Massachusetts Institute of Technology, and a Ph.D. in Earth Resources Engineering from Kyoto University in Japan. His main research areas are seismic refraction, active/passive surface waves, and numerical simulation. He is the author of the SeisImager one of the premier surface waves, refraction, and downhole data processing packages. He was selected as the SEG Near-Surface Honorary Lecturer with his talk entitled “Integrated Geophysical Methods Applied to Geotechnical and Geohazard Engineering: From Qualitative to Quantitative Analysis and Interpretation”. He is currently in charge of a lecturer for a SEG training course “Passive Surface Wave Methods Using Ambient Noise: from Basic 1D Soundings to High-resolution 3D Imaging”.

Research Interests

• Seismic refraction tomography
• Finite-difference viscoelastic seismic modeling
• Microtremor array measurements
• Surface wave methods
• Geophysical exploration

Research Areas

• Social infrastructure (civil Engineering, architecture, disaster prevention), Geotechnical engineering, Exploration geophysics
• Social infrastructure (civil Engineering, architecture, disaster prevention), Structural and seismic engineering, Earthquake engineering
• Natural sciences, Solid earth science, Geophysics
• Natural sciences, Solid earth science, Seismology

Papers

• Joint analysis of multi-shot, multi-channel surface-wave data and micro-gravity data

  Koichi Hayashi; Toshifumi Matsuoka; Hideki Hatakeyama

  SEG Technical Program Expanded Abstracts, 01 Jan. 2004

  
• Estimating S-wave velocity profiles from horizontal-to-vertical spectral ratios based on deep learning

  Koichi Hayashi; Toru Suzuki; Tomio Inazaki; Chisato Konishi; Haruhiko Suzuki; Hisanori Matsuyama

  Soils and Foundations, Dec. 2024, Peer-reviewed, Lead author

  Access this paper :

  
• CHALLENGE TO HEALTH MONITORING OF EXPRESSWAY EARTHWORK STRUCTURES WITHOUT TRAFFIC CONTROL

  Kosuke NAKASHIMA; Kazuyori FUJIOKA; Shinya UENO; Atsushi YASHIMA; Mitsuru YAMAZAKI; Kazuhide SAWADA; Yoshinobu MURATA; Chisato KONISHI; Koichi HAYASHI; Yuichi MACHIJIMA

  Japanese Journal of JSCE, 2024, Peer-reviewed

  
• 常時微動探査による地層区分と熊本城三次元地盤図を援用した石垣被災要因の検討

  Masaki OGINO; Minoru YAMANAKA; Kouichi HAYASHI; Takuya NAKADA; Tetsuya KAMURA

  Japanese Geotechnical Journal, 01 Mar. 2024, Peer-reviewed

  
• Correction to: Microtremor array method using spatial autocorrelation analysis of Rayleigh-wave data

  Koichi Hayashi; Michael W. Asten; William J. Stephenson; Cécile Cornou; Manuel Hobiger; Marco Pilz; Hiroaki Yamanaka

  Journal of Seismology, Aug. 2022, Peer-reviewed, Lead author

  
• Imaging subsurface structure over the Xiadian fault using P waves extracted from urban traffic noise

  Youngseok Song; Soon Jee Seol; Joongmoo Byun; Koichi Hayashi; Shunjia Tan

  Geophysical Journal International, 31 May 2022, Peer-reviewed

  
• Three-dimensional microtremor array measurement with irregular receiver geometries in town and residential area

  Chisato Konishi; Haruhiko Suzuki; Shunsuke Hamada; Koichi Hayashi

  BUTSURI-TANSA(Geophysical Exploration), 2022, Peer-reviewed

  
• An assessment of uncertainties in VS profiles obtained from microtremor observations in the phased 2018 COSMOS blind trials

  Michael W. Asten; Alan Yong; Sebastiano Foti; Koichi Hayashi; Antony J. Martin; William J. Stephenson; John F. Cassidy; Jacie Coleman; Robert Nigbor; Silvia Castellaro; Kosuke Chimoto; Cécile Cornou; Ikuo Cho; Takumi Hayashida; Manuel Hobiger; Chun-Hsiang Kuo; Albert Macau; E. Diego Mercerat; Sheri Molnar; Passakorn Pananont; Marco Pilz; Nakhorn Poovarodom; Esteban Sáez; Marc Wathelet; Hiroaki Yamanaka; Toshiaki Yokoi; Don Zhao

  Journal of Seismology, 01 Jan. 2022, Peer-reviewed

  
• Common-midpoint spatial autocorrelation analysis of seismic ambient noise obtained from a spatially unaliased sensor distribution

  Koichi Hayashi; Mitchell Craig; Shunjia Tan; Chisato Konishi; Haruhiko Suzuki; Michitaka Tahara; Kent Falkenstein; Bin He; Daxiang Cheng

  GEOPHYSICS, 01 Jul. 2021, Peer-reviewed, Lead author

  
• Active and passive seismic surface wave methods for levee assessment in the Sacramento–San Joaquin Delta, California, USA

  Mitchell S. Craig; Koichi Hayashi; Özgür Kozacı

  Near Surface Geophysics, 10 Feb. 2021, Peer-reviewed

  
• The debris avalanche in Donghekou area triggered by the 2008 Wenchuan (M8.0) earthquake: Features and possible transportation mechanisms

  Gonghui Wang; Fanyu Zhang; Gen Furuya; Koichi Hayashi; Wei Hu; Mauri McSaveney; Runqiu Huang

  Engineering Geology, Jan. 2021, Peer-reviewed

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• Application of the Spatial Auto-Correlation Method for Shear-Wave Velocity Studies Using Ambient Noise

  M. W. Asten; K. Hayashi

  Surveys in Geophysics, 02 May 2018, Peer-reviewed

  
• Guidelines for the good practice of surface wave analysis: a product of the InterPACIFIC project

  Sebastiano Foti; Fabrice Hollender; Flora Garofalo; Dario Albarello; Michael Asten; Pierre-Yves Bard; Cesare Comina; Cécile Cornou; Brady Cox; Giuseppe Di Giulio; Thomas Forbriger; Koichi Hayashi; Enrico Lunedei; Antony Martin; Diego Mercerat; Matthias Ohrnberger; Valerio Poggi; Florence Renalier; Deborah Sicilia; Valentina Socco

  Bulletin of Earthquake Engineering, 04 Sep. 2017, Peer-reviewed

  
• S-wave velocity measurement and the effect of basin geometry on site response, east San Francisco Bay area, California, USA

  Koichi Hayashi; Mitchell Craig

  Physics and Chemistry of the Earth, Parts A/B/C, Apr. 2017, Peer-reviewed, Lead author

  
• Surface wave surveying for near-surface site characterization in the East San Francisco Bay Area, California

  Mitchell Craig; Koichi Hayashi

  Interpretation, 01 Nov. 2016, Peer-reviewed

  
• InterPACIFIC project: Comparison of invasive and non-invasive methods for seismic site characterization. Part I: Intra-comparison of surface wave methods

  F. Garofalo; S. Foti; F. Hollender; P.Y. Bard; C. Cornou; B.R. Cox; M. Ohrnberger; D. Sicilia; M. Asten; G. Di Giulio; T. Forbriger; B. Guillier; K. Hayashi; A. Martin; S. Matsushima; D. Mercerat; V. Poggi; H. Yamanaka

  Soil Dynamics and Earthquake Engineering, Mar. 2016, Peer-reviewed

  
• Blind Test of Methods for Obtaining 2-D Near-Surface Seismic Velocity Models from First-Arrival Traveltimes

  Colin A Zelt; Seth Haines; Michael H Powers; Jacob Sheehan; Siegfried Rohdewald; Curtis Link; Koichi Hayashi; Don Zhao; Hua-wei Zhou; Bethany L Burton; Uni K Petersen; Nedra D Bonal; William E Doll

  Journal of Environmental and Engineering Geophysics, Sep. 2013, Peer-reviewed

  
• Multimode inversion with amplitude response of surface waves in the spatial autocorrelation method

  Tatsunori Ikeda; Toshifumi Matsuoka; Takeshi Tsuji; Koichi Hayashi

  Geophysical Journal International, 14 May 2012, Peer-reviewed

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• Improvement of Estimation Accuracy of Sandflat Stratigraphy with Intermediate Soft Sublayer -Combination Use of MASW and Microtremor Array Measurements

  WATABE Yoichi; SASSA Shinji; YAMADA Fumihiko; HAYASHI Koichi

  Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering), 2011, Peer-reviewed

  
• Multi-mode analysis of Spatial Auto Correlation (SPAC) method considering different correlation distance

  Tatsunori Ikeda; Toshifumi Matsuoka; Takeshi Tsuji; Koichi Hayashi

  BUTSURI-TANSA(Geophysical Exploration), 2011, Peer-reviewed

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• A study on geographical analysis of a residential housing development on artificial fill

  Katsuya MATSUSHITA; Mamoru FUJII; Tomohiro MORI; Motoki KAZAMA; Koichi HAYASHI

  Jiban Kogaku Janaru (Japanese Geotechnical Journal), 2010, Peer-reviewed

  
• Consideration to database and software for the interpretation of an advanced tunnel seismic refraction method

  Koichi Hayashi; Hideki Saito; Masahiko Akasawa; Tunnel Geophysics Consortium

  BUTSURI-TANSA(Geophysical Exploration), 2010, Peer-reviewed, Lead author

  
• Experiments on the stability of the spatial autocorrelation method (SPAC) and linear array methods and on the imaginary part of the SPAC coefficients as an indicator of data quality

  Sos Margaryan; Toshiaki Yokoi; Koichi Hayashi

  Exploration Geophysics, Mar. 2009, Peer-reviewed

  
• Site investigation by surface-wave method and micro-tremor array measurements at central Anamizu, Ishikawa Prefecture

  Koichi Hayashi; Tsutomu Hirade; Masanori Iiba; Tomio Inazaki; Hirohito Takahashi

  BUTSURI-TANSA(Geophysical Exploration), 2008, Peer-reviewed, Lead author

  
• Simple evaluation method for seismic performance of slightly-inclined residential ground based on surface-wave investigation and dynamic elasto-plastic finite element method

  Akihiko Wakai; Masahito Tamura; Koichi Hayashi; Toshitaka Kamai; Naomichi Shimizu

  Journal of applied mechanics, 2007, Peer-reviewed

  
• ESTIMATION OF GROUND MOTION AT ARBITRARY POINTS USING TRANSFER FUNCTION BETWEEN TWO POINTS BASED ON SOIL MODEL AND STRONG MOTION RECORDS

  Hirohito TAKAHASHI; Nobuo FUKUWA; Koichi HAYASHI; Jun TOBITA

  Journal of Structural and Construction Engineering (Transactions of AIJ), 2006, Peer-reviewed

  
• Joint Analysis of a Surface-wave Method and Micro-gravity Survey

  Koichi Hayashi; Toshifumi Matsuoka; Hideki Hatakeyama

  Journal of Environmental and Engineering Geophysics, Jun. 2005, Peer-reviewed, Lead author

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• A Study on Overall Properties of Seismic Response and Investigation Method of Counter-Measured Ground against Liquefaction

  Yumi SATO; Kenichi MAEDA; Koichi HAYASHI; Yoshinobu MURATA; Toshiyuki TAKAHARA

  Journal of the Society of Materials Science, Japan, 2005, Peer-reviewed

  
• CMP cross-correlation analysis of multi-channel surface-wave data

  Koichi Hayashi; Haruhiko Suzuki

  Exploration Geophysics, Mar. 2004, Peer-reviewed, Lead author

  
• Discontinuous-Grid Finite-Difference Seismic Modeling Including Surface Topography

  K. Hayashi

  Bulletin of the Seismological Society of America, 01 Dec. 2001, Peer-reviewed, Lead author

  
• High resolution seismic refraction method using surface and borehole data for site characterization of rocks

  K. Hayashi; T. Takahashi

  International Journal of Rock Mechanics and Mining Sciences, Sep. 2001, Peer-reviewed, Lead author

  
• 高精度屈折法地震探査の開発と適用例

  林宏一; 斎藤秀樹

  物理探査, 1998, Peer-reviewed, Lead author

  

Misc.

• Evaluation of vibration characteristics at improved soft ground by surface wave method

  T. Ikeda; T. Matsuoka; T. Tsuji; K. Hayashi

  Proceedings of the Symposium on the Application of Geophyics to Engineering and Environmental Problems, SAGEEP, 2011, Peer-reviewed

  
• 地盤工学と物理探査の架け橋 －空間的な補間と時間的な補間－

  林 宏一

  地盤工学会誌, Jun. 2024, Invited, Lead author

  
• 表面波を用いる探査法の原理とその応用

  林 宏一

  基礎工, Mar. 2024, Invited

  
• 表面波を用いた二次元/三次元探査

  林 宏一; 小西 千里

  Feb. 2020, Invited, Lead author

  

Presentations

• 常時微動を用いた盛土のS波速度の連続測定

  林宏一; 石塚理; 石川貴規; 小西千里; 酒井直樹

  物理探査学会第149回学術講演会, Oct. 2024

  
• Estimating S-wave velocity profile from horizontal-to-vertical spectral ratio based on supervised machine learning

  Koichi Hayashi; Toru Suzuki; Tomio Inazaki; Chisato Konishi; Haruhiko Suzuki; Hisanori Matsuyama

  6th Asia Pacific Meeting on Near Surface Geoscience & Engineering, May 2024, Invited

  
• 常時微動の連続測定により観測された降雨に伴うS波速度の変化

  林 宏一

  物理探査学会第150回学術講演会

  

Books and Other Publications

• Seismic ambient noise

  Koichi Hayashi, Contributor, Near-surface engineering

  Cambridge University Press, 2019

  
• 河川堤防の統合物理探査 : 安全性評価への適用の手引き

  土木研究所; 物理探査学会, Contributor

  愛智出版, Mar. 2013

  Find Kyoto University's collection of books :

  

Awards

• 03 Nov. 2014

  Honorary Lecturer(Society of Exploration Geophysics)
• 01 Jun. 2023

  物理探査学会論文業績賞・事例研究賞
• 03 Jun. 2013

  物理探査学会学会運営功績賞
• 01 Jun. 2006

  物理探査学会学会賞

Administration

Faculty management (title, position)

• From 01 Apr. 2024, To 31 Mar. 2026

  防災研究所研究コンプライアンス推進委員会 委員