Welcome To My Home Page: Toshiaki Yokoi

Self introduction

Name: Toshiaki Yokoi, Dsc.
Research field: Applied Seismology, Engineering Seismology
Affiliation: International Institute of Seismology and Earthquake Engineering, Building Research Institute, Japan
Postal Address: Tachihara-1, Tsukuba, Ibaraki, 305-0802 Japan
Tel: +81-29-864-6648
Fax: +81-29-864-6777
Current Position: Director of IISEE

Education

1982 Graduated from Faculty of Science, Kyoto Univ. (Department of Geophysics).
1984 Graduated from Master Course, Graduate School of Science, Kyoto Univ. (Applied Seismology).
1996 Dissertation Doctor (Applied Seismolgy) from Graduate School of Science, Kyoto Univ.

Job History

1984 to Jul., 1990, Research Stuff at Kokusai-Kogyo Corp.
1986 to 1989, Member of Japan Overseas Cooperation Volunteer in Republic of Colombia.
1990 to 1996, Research Associate at Mining College of Akita University.
1996 to 2013, Research Staff of IISEE.
From 2013 Present Position.
From 2005 to Present, Adjunct Professor, National Graduate Institute of Policy Studies

Academic Societies

Seismological Society of Japan
Seismological Society of America
Society of Exploration Geophysicists
Society of Exploration Geophysicists, Japan
Architectural Institute of Japan
Japan Association of Earthquake Engineering
Japan Geoscience Union

Research Subject

Applied Seismology & Engineering Seismology (Wave Propagation, Strong Motion Study, Site & Source Effects on Seismic Motion, Geophysical Exploration including Microtremor Method).

Free Software

SPAC
CCA
MASW

Publications

Reviewed papers (2007-Present):

  1. Mukunda Bhattarai, Lok Bijaya Adhikari, Umesh Prasad Gautam, Laurent Bollinger, Bruno Hernandez, Toshiaki Yokoi, Takumi Hayashida (2017): Establishing a reference rock site for the site effect study in and around the Kathmandu valley, Nepal, Earth, Planets and Space, 68: 82 DOI: 10.1186/s40623-016-0454-9.
  2. Moneer Al-Masani, Toshiaki Yokoi, Issa El-Hussain, Ahmed Deif, Salam Al-Hashmi, Kalfan Al-Toubi, Yusif Al-Shijbi, Majed Al-Saifi (2016): Application of NEHRP: Classification to AVS30 Obtained from Microtremor Array Measurement in Muscat, Oman, Bulletin of IISEE, Vol. 50, p24-36.
  3. Nakagawa, H., T. Hayashida, T. Yokoi, T. Kashima, S. Koyama, C. B. M. Wiradikarta, and J. R. Guerra-Carballo (2015): A Microtremor Exploration in Iwaki City Hall for Evaluation of Inclined Bedrock, Jour of JAEE, Vol.15, No.7, 60-71. (in Japanese with English Abstract).
  4. Chavez-Garcia, F. J. and T. Yokoi (2015): High lateral resolution exploration using surface waves from noise records, Exploration Geophysics, Vol.47, No.2, 123-132.
  5. T. Yokoi (2014): On the Correction of System Characteristics and Improvement of the Long Wavelength Approximation for Microtremor Exploration Using Small Scale Array, BUTURI-TANSA, Vol.67, No.4, 255-266 (in Japanese with English Abstract).
  6. Yokoi T., K. M. Black, H. Nakagawa, H. Suzuki, H. Saito (2013): Exploration at Yoshino General Park in Joso City, Ibaraki Pref., Japan where the ground failure by liquefaction took place due to the 2011 off the Pacific coast of Tohoku Earthquake, BUTSURI-TANSA, Vol. 66, No.1, 13-24 (in Japanese with English Abstract).
  7. N. Jorjiashvili, T. Yokoi , Z. Javakhishvili (2012):Assessment of uncertainties related to seismic hazard using fuzzy analysis, Natural Hazards, Vol.60, No.2, 501-515.
  8. Yokoi, T. (2010): New formulas derived from Seismic Interferometry to simulate the phase velocity estimates from the correlation methods using microtremor, Geophysics, Vol.75, SA71-SA83.
  9. Yokoi, T. (2009): Dual Mode Inversion Based on Seismic Interferometry for Dispersion Curve of Rayleigh Waves Determined using Correlation Method for Microtremor, BUTURI-TANSA, Vol.62, No.5, 521-530 (in Japanese with English Abstract).
  10. Margaryan, S. & T. Yokoi (2009): Experiments on the Stability of the SPAC and Linear Array Methods and on the Imaginary Part of the SPAC Coefficients As an Indicator of the Quality of Data, Exploration Geophysics, Vol. 40, p1-10.
  11. Yokoi, T. & S. Margaryan (2008): Consistency of Spatial Autocorrelation Method with The Seismic Interferometry and Its Consequence, Geophysical Prospecting, Vol. 35, 435-451.
  12. Yokoi, T. & S. Margaryan (2008): Re-Checking Spatial Auto Correlation Method Based on the Theory of Seismic Interferometry, BUTURI-TANSA, Vol. 61, p87-100 (in Japanese with English Abstract).

Conference Papers(2007-Present):

  1. Faouzi Gherboudj , Hiroe Miyake , Toshiaki Yokoi , Nasser Laouami (2017): Ground Motion Simulation of The 2003 Boumerdes Earthquake Using Empirical Green’s Function Method, 16th European Conference on Earthquake Engineering.
  2. Mukunda Bhattarai, Dinesh Nepali, Santosh Dhakal , Suresh Shrestha , Toshiaki Yokoi , Takumi Hayashida (2017): On Anomalous Coherence Functions for SPAC Method Applied in Kathmandu, Nepal for Exploring Deep Sedimentary Layers, Abstract, SEGJ Fall Meeting.
  3. Mukunda Bhattarai, Dinesh Nepali, Santosh Dhakal , Suresh Shrestha , Toshiaki Yokoi , Takumi Hayashida (2017): Microtremor Array Exploration for Deep Sedimentary Layers in The Central Part Of The Kathmandu Valley, Nepal, Proceedings, JAEE Annual Meeting.
  4. Hayashida, T., H. Nakagawa, T. Yokoi, S. Koyama, T. Kashima, and S. Nagano (2017): Verification of Subsurface S-Wave Velocity Structure Model in Iwaki City, Fukushima Prefecture, Using A Dense Seismic Array, 16WCEE.
  5. Nakagawa, H., T. Hayashida, T. Yokoi, T. Kashima, S. Koyama, C. B. M. Wiradikarta, and J. R. Guerra-Carballo (2014): A Microtremor Exploration in Iwaki City Hall for Evaluation of Inclined Bedrock, the 14th Japan Earthquake Engineering Symposium, 3082-3091 (in Japanese with English Abstract).
  6. Tezel, T., H. Miyake, and T. Yokoi (2014): Empirical Green's function simulation of ground motions for the 2013 Gokceada, Turkey, earthquake, Proceedings of the 2nd European Conference on Earthquake Engineering and Seismology.
  7. Chavez-Garcia, F. J. and T. Yokoi (2013): High lateral resolution exploration using surface waves from noise records, Proceedings of the 11th SEGJ International Symposium, 2013.
  8. T. Yokoi (2012): On the Correction of System Characteristics etc. for Microtremor Exploration Using Small Scale Array, Proceedings of the 126th SEGJ Conference, Tokyo. (in Japanese).
  9. Black, K. M., T. Yokoi, H. Nakagawa, H. Suzuki and H. Saito (2011): Exploration using SPAC and MASW (CMPCC) at Yoshino General Park in Joso City, Ibaraki Pref., Japan where the ground failure by liquefaction took place due to the 2011 off the Pacific coast of Tohoku Earthquake, Proceedings of the 125th SEGJ Conference, Akita.
  10. Black, K. M., T. Yokoi, H. Nakagawa, H. Suzuki and H. Saito (2011): Exploration at Yoshino Park, Joso City, Proceedings of the 8th Annual Meeting of Japan Association for Earthquake Engineering, Tokyo (in Japanese).
  11. Yokoi, T. and K. Hayashi (2010): Validating the Multi-Modal Formulation of SPAC Coefficient Using Field Data, 13-th Japan Earthquake Engineering Symposium, Tsukuba.
  12. Yokoi, T. and K. Hayashi (2010): A Field Experiment of Dual Mode SPAC in Jyoso City, Japan, Proceedings of the 123th SEGJ Conference, Sendai (in Japanese with English Abstract).
  13. Yokoi, T. and K. Hayashi (2010): A Field Experiment of Dual Mode SPAC in Jyoso City, Japan, Expanded Abstract of 9th International Workshop on Seismic Microzoning and Risk Reduction, Cuernavaca, Mexico.
  14. Yokoi, T., Sandino, D. Y. B., Margaryan S., Al-Masani, M. A. M., Castillo, A. J. A. and Hayashi. K. (2009): Exploration Methods Using Microtremor Array, Proceedings of the 9th SEGJ international Symposium, Sapporo.
  15. Yokoi, T. and K. Hayashi (2009): A Comparative Field Experiment of SPAC and CCA Methods in Jyoso City, Japan, Proceedings of the 121th SEGJ Conference, Tokyo (in Japanese with English Abstract).
  16. Yokoi, T. (2009): Correlation Method Revisited with a Consequence of Seismic Interferometry, Proceedings of Six International Conference on Urban Earthquake Engineering, Tokyo.
  17. Dayra Yessenia Blandon Sandino, Toshiaki Yokoi, Koichi Hayashi (2008): Estimation of Shear Wave Velocity Structure and Ground Classification Using Array Observation of Short Period Microtremor in Koshigaya City, Japan, Proceedings of the 6th Annual Meeting of Japan Association for Earthquake Engineering, Sendai.
  18. Yokoi, T. (2008): Numerical Experiment about the Effect of the 1st Higher Normal Mode on the Rayleigh Wave's dispersion Curve Determined from Microtremor Array Observation and Correlation Analysis, Proceedings of the 6th Annual Meeting of Japan Association for Earthquake Engineering, Sendai (in Japanese).
  19. Yokoi, T. (2008): Dual Mode Inversion for Dispersion Curve of Rayleigh Wave based on a consequence of Seismic Interferometry, Proceedings of the 119th SEGJ Conference, Tokyo (in Japanese with English Abstract).
  20. Saito, T., N. Hurukawa, T. Yokoi, T. Hara, B. Shibasaki, Y. Fujii, S. Koyama, T. Kashima, & T. Mukai (2008): Training System and Information Network for Earthquake Disaster Mitigation, Proceedings of the 14th World Conference of Earthquake Engineering, Beijing.
  21. Yokoi, T., J. Subedi, R. Rajbhandari, M. B. Prajapati, T. Mori, A. Takubo & M. Niwa (2008): Free GIS Plus Database System for Dissemination Activity of Earthquake Disaster Mitigation, Proceedings of 14th World Conference of Earthquake Engineering, Beijing.
  22. T. Yokoi & S. Margaryan (2008): Interpretation of Spatial Autocorrelation Method Based on the Theory of Seismic Interferometry, Proceedings of the 14th World Conference of Eartrhquake Engineering, Beijing.
  23. Margaryan, S. & T. Yokoi (2008): On the stability of SPAC and Linear array methods, Proceedings of the 14th World Conference of Earthquake Engineering, Beijing.
  24. Yokoi, T. (2008): On the effect of the 1st higher mode on the dispersion curve determined by array observation of microtremor and correlation based analysis - Toward a quantitative estimation -,
  25. Proceedings of the 118th SEGJ Conference, Tokyo (in Japanese with English Abstract).
  26. Yokoi, T. (2008): On Numerical Experiment for the CCA Using Only Three Geophones Simultaneously, Proceedings of the 118th SEGJ Conference, Tokyo (in Japanese with English Abstract).
  27. Yokoi, T. and S. Margaryan (2007): Interpretation of SPAC method based on Seismic Interferometry ? Theory and Observation, Proceedings of International conference associated to the 50th anniversary of the Gobi-Altai earthquake (Mw=8.1), Ulaanbaatar, Mongolia.
  28. Margaryan S. and T. Yokoi (2007): Experiments on the stability of SPAC, 2sSPAC and Linear Array method, Proceedings of the meeting of International Union of Geodesy and Geophysics, Perugia, Italy.

Presentation (2007-Present)

  1. Mukunda Bhattarai, Lok Bijaya Adhikari, Bharat Prasad Koirala, Dinesh Nepali, Santosh Dhakal, Suresh Shrestha, Toshiaki Yokoi, Takumi Hayashida (2017): Determination of Deep Subsurface Shear wave Velocity Structure in the Central Part of the Kathmandu Valley, Nepal Using Broad Band Seismograph Arrays for Long Period Microtremor, 11th Asian Regional Conference of International Association of Engineering Geology for Geo-Disaster Management, Kathmandu.
  2. Tara Pokharel, Toshiaki Yokoi and Takumi Hayashida (2017): Comparison of SPAC and CCA Methods of Analysis to Estimate Subsurface Shear Wave Velocity Structure Using Microtremor Array Measurements, 11th Asian Regional Conference of International Association of Engineering Geology for Geo-Disaster Management, Kathmandu.
  3. Baigalimaa Ganbat, Toshiaki Yokoi, Takumi Hayashida (2017): Estimation of Source, Path and Site Effects in Hangay region Mongolia using a dense broadband seismic array, IAG-IASPEI2017, S07-1-02
  4. Takumi Hayashida, Toshiaki Yokoi, Hiroto Nakagawa, Toshihide Kashima, Shin Koyama (2017):Simulation of Strong Ground Motions in and around Iwaki City, Fukushima Prefecture, using Pseudo Point-source Model, , IAG-IASPEI2017, S07-5-01
  5. Mukunda Bhattarai, Dinesh Nepali, Santosh Dhakal, Suresh Shrestha,Toshiaki Yokoi, Takumi Hayashida (2017): Determination Of Deep Subsurface Sharewave Velocity Structure In The Central Part Of The Kathmandu Basin, Nepal Using Broad Band Seismograph Arrays For Long Period Microtremor, IAG-IASPEI2017, S07-7-04
  6. Bhattarai, M., U. P. Gautam, R. Pandey, L. Bollinger, B. Hernandez, V. Boutin, T. Yokoi, T. Hayashida (2014): Strong Ground Motion Records from the Accelerometric Network of Nepal, Abstracts of AOGS2014, Sapporo.
  7. Black, K. M., T. Yokoi, H. Nakagawa, H. Suzuki and H. Saito (2011): Exploration at liquefied Site in Joso city, the 2011 Fall Meeting of Seismological Society of Japan, Shizuoka.
  8. Swe, K. K. and T. Yokoi (2011): A Case Study on DNL using KIK-Net Records due to the 2011 Off the Pacific Coast Earthquake (Mw9.0) and Its Aftershocks, , the 2011 Fall Meeting of Seismological Society of Japan, Shizuoka.
  9. Yokoi, T. and K. Hayashi (2010): A Field Experiment of Dual Mode SPAC in Jyoso City, the 2010 Fall Meeting of Seismological Society of Japan, Hiroshima.
  10. Yokoi, T. (2009): Microtremor Exploration and Seismic Interferometry, One-Day Seminar, Society of Exploration Geophysicists Japan.
  11. Yokoi, T. (2009): Microtremor Array Exploration Method and Seismic Interferometry, 183-th meeting, the Coordination Committee of Earthquake Prediction, Japan.
  12. Yokoi, T. and K. Hayashi (2009): A Comparative Field Experiment for CCA Methods, the 2009 Fall Meeting of Seismological Society of Japan, Kyoto.
  13. Yokoi, T.(2009): Information and/or Consideration on: Disaster Management Cycle, Earthquake Prediction in Japan, Earthquake Early Warning, the 2nd JICA Seminar for the Basic Survey of Earthquake Disaster Prevention in Almaty City, Kazakhstan, Almaty.
  14. Yokoi, T. & S. Margaryan (2008): Interpretation of Spatial Autocorrelation Method Based on the Theory of Seismic Interferometry, the 7th General Assembly of Asian Seismological Commission and the 2008 Fall Meeting of Seismological Society of Japan, Tsukuba.
  15. Margaryan, S. & T. Yokoi (2008): On the stability of SPAC and Linear array methods, the 7th General Assembly of Asian Seismological Commission and the 2008 Fall Meeting of Seismological Society of Japan, Tsukuba.
  16. Yokoi, T., J. Subedi, R. Rajbhandari, M. B. Prajapati, T. Mori, A. Takubo & M. Niwa (2008): Free GIS Plus Database System for Dissemination Activity of Earthquake Disaster Mitigation, the 7th General Assembly of Asian Seismological Commission and the 2008 Fall Meeting of Seismological Society of Japan, Tsukuba.
  17. Yokoi, T. (2008): On Comparison of CCA with SPAC Using Simulated Microtremor Records and the CCA Using Only Three Geophones Simultaneously, Abstracts, Japan Geo Science Union Meeting 2008, Chiba.
  18. Yokoi, T. and T. Mori (2007): Free GIS plus DataBase for Earthquake Disaster Mitigation, the 2007 Fall Meeting of Seismological Society of Japan, Sendai.
  19. Margaryan, S. and Yokoi, T. (2007): Experiments on stability of SPAC and Linear Array method, the 2007 Fall Meeting of Seismological Society of Japan, Sendai.
  20. Yokoi, T. (2007): On relation of SPAC method with Seismic Interferometry, Abstracts, Japan Geo Science Union Meeting 2007, Chiba.

Last UPDATE : Dec. 18, 2017