Kazunori YOSHIZAWA

Associate Professor

Ph.D., Australian National University (2002)

English/Japanese


Go to Global Seismology Lab.

Global Seismology Laboratory
Earth and Planetary Dynamics

Dept. of Natural History Sciences
Faculty of Science, HOKKAIDO UNIVERSITY

OFFICE: Science Buildg. 8-310
TEL: +81-11-706-3620
FAX: +81-11-746-2715
E-mail：


　　Research Interests | Academic Background | Recent Publications

Research Interests

The study of the Earth's internal structure and dynamics using seismological techniques, and seismic wave propagation in laterally heterogeneous media. Analysis of anomalous propagation of surface and body waves and its application to inversion scheme. The development of inversion techniques for seismic waves.

Earth Structure

Seismic Wave Propagation

Waveform Analysis / Geophysical Inversion

Parallel Computing in Geophysical Problems


Academic Background

Ph.D. degree:

Australian National University, 2002.

M.Sc. degree:

Hiroshima University, 1998


Appointments:

1998

JSPS Research Fellow


Hokkaido University

2002.04-2006.03

Instructor, Div. of Earth and Planetary Sciences

2006.04-2007.03

Instructor, Dept. of Natural History Sciences

2007.04-2007.05

Assistant Professor, Dept. of Natural History Sciences

2007.05-present

Associate Professor, Dept. of Natural History Sciences

             (Adjunct Research Fellow, Institute of Seismology and Volcanology)

2008.02-2010.02

Visiting Research Scientist (JSPS Research Fellow)
at Lamont-Doherty Earth Observatory, Columbia University


Awards:

2001.12

Outstanding Student Paper Award
　　(American Geophysical Union, Seismology Section)
 Title: Surface Wave Tomography: A Three-Stage Approach

2007.05

Young Investigator Award

    (Seismological Society of Japan)


Academic Services:

Member of the IUGG working group "Geoscieces: The Future"
  (representative of the IASPEI) [report in PDF]

Local liaison committee, Seismologoical Society of Japan
  (representative of the Hokkaido University)


For more detailed CV, click here.

Recent Publications

Journal Articles (refereed)

  1. Yoshizawa K., Yomogida K. and Tsuboi S. (1999)
    Resolving power of surface wave polarization data for higher-order heterogeneities, Geophys. J. Int., 138, 205-220. [PDF reprint]
  2. Yoshizawa K. and Kennett B.L.N. (2002)
    Non-linear waveform inversion for surface waves with a neighbourhood algorithm - Application to multimode dispersion measurements, Geophys. J. Int., 149, 118-133. [PDF reprint]
  3. Yoshizawa K. and Kennett B.L.N. (2002)
    Determination of the influence zone for surface wave paths, Geophys. J. Int., 149, 440-453. [PDF reprint]
  4. Kennett B.L.N. and Yoshizawa K. (2002)
    A reappraisal of regional surface wave tomography, Geophys. J. Int., 150, 37-44. [PDF reprint]
  5. Yoshizawa K. and Kennett B.L.N. (2004)
    Multi-mode surface wave tomography for the Australian region using a three-stage approach incorporating finite frequency effects, J. Geophys. Res., 109, B02310, doi:10.1029/2002JB002254. [PDF reprint]
  6. Adlen, S., Brodsky, E.E., Oki, T., Ridley, A.J., Sanchez, L., Simionato, C., Yoshizawa K. and Shamir, U. (2004)
    New report charts course for future of geosciences, EOS Trans. AGU, 85, 25,31. [PDF reprint]
  7. Yoshizawa K. (2004)
    Probing into the upper mantle using waveform inversion for surface waves: Beyond the geometrical ray theory, Zisin, 57, 393-408. (in Japanese with English abstract)
  8. Goes S., Simons F.J. and Yoshizawa K.(2005)
    Seismic constraints on temperature of the Australian uppermost mantle, Earth Planet. Sci. Lett., 236, 227-237.
  9. Yoshizawa K. and Kennett B.L.N. (2005)
    Sensitivity kernels for finite-frequency surface waves, Geophys. J. Int., 162, 910-926.
  10. Isse T., Yoshizawa K., Shiobara H., Shinohara M., Nakahigashi K., Mochizuki K., Sugioka H., Suetsugu D., Oki S., Kanazawa T., Suyehiro K. and Fukao Y. (2006)
    Three-dimensional shear wave structure beneath the Philippine Sea from land and ocean bottom broadband seismograms, J. Geophys. Res., 111, B06310, doi:10.1029/2005JB003750.
  11. Isse T., Suetsugu D., Shiobara H., Sugioka H., Yoshizawa K., Kanazawa T. and Fukao Y. (2006)
    Shear wave speed structure beneath the South Pacific superswell using broadband data from ocean floor and islands, Geophys. Res. Lett., 33, L16303, doi:10.1029/2006GL026872.
  12. Fishwick, S., Heinz, M., Kennett, B.L.N., Reading, A.M. and Yoshizawa, K. (2008)
    Steps in lithospheric thickness within Australia, evidence from surface wave tomography, Tectonics, TC4009, doi:10.1029/2007TC002116.
  13. Isse, T., Shiobara, H., Tamura, Y., Suetsugu, D., Yoshizawa, K., Sugioka, H., Ito, A., Kawakatsu, H., Shito, A., Adam, C., Kanazawa, T., Fukao, Y., Gill, J.B., Ishizuka, O. (2009)
    Seismic structure of the upper mantle beneath the Philippine Sea from seafloor and land observation: Implications for mantle convection and magma genesis in the Izu-Bonin-Mariana subduction zone, Earth Planet. Sci. Lett., 278, 107-119.
  14. Yoshizawa, K., Miyake, K. and Yomogida, K. (2010)
    3-D upper mantle structure beneath Japan and its surrounding region from inter-station dispersion measurements of surface waves, Phys. Earth Planet. Inter., doi:10.1016/j.pepi.2010.02.012, in press.
  15. Isse, T., Shiobara, H., Montagner, J.-P., Sugioka, H., Ito, A., Shito, A., Kanazawa, T. and Yoshizawa, K. (2010)
    Anisotropic structures in the upper mantle beneath the northern Philippine Sea region from Rayleigh and Love wave tomography, Phys. Earth Planet. Inter., in press.

  16. Bourova, E., Yoshizawa, K. and Yomogida, K. (2010)
    Upper mantle structure of marginal seas and subduction zones in northeastern Eurasia from Rayleigh wave tomography, Phys. Earth Planet. Inter., in press.

  17. Osada, K., Yoshizawa, K. and Yomogida, K. (2010)
    Upper boundary of the Pacific plate subducting beneath Hokkaido, Japan, estimated from ScSp phase, Phys. Earth Planet. Inter., in press.

　Under review:

  1. Yoshizawa, K. and Ekstrom, G. (2009)
    Automated multi-mode phase speed measurements for high-resolution regional-scale tomography: Application to North America, Geophys. J. Int., submitted (revised).

Thesis:

Technical Reports, etc.

  1. Yoshizawa K., Yomogida K. and Tsuboi S. (1997)
    Higher-order heterogeneity in the upper mantle inferred from Rayleigh-wave polarization data, Proceedings for International Symposium on New Images of the Earth's Interior through Long-term Ocean-floor Observations, 145-148.
  2. Yoshizawa K. and Kennett B.L.N. (1999)
    Surface wave propagation in 3-D laterally heterogeneous media, Annual Report 1999, 21-22, Research School of Earth Sciences, Australian National University.
  3. Yoshizawa K. (2000)
    Surface waves in three-dimensional structures, Mid-term Report, Aus-tralian National University.
  4. Yoshizawa K., Hiyoshi Y. and Kennett B.L.N. (2000)
    Extending surface wave tomography, Annual Report 2000, 129-132, Research School of Earth Sciences, Australian National University.
  5. Yoshizawa K. and Kennett B.L.N. (2001)
    Extending surface wave tomography, Proceedings for OHP/ION Symposium on Long-term Observations in the Oceans: Current Status and Perspectives for the Future, 200-203.
  6. Yoshizawa K. and Kennett B.L.N. (2001)
    Three-stage inversion: A new approach for surface wave tomography, Annual Report 2001, Research School of Earth Sciences, Australian National University.
  7. Yoshizawa K. and Kennett B.L.N. (2002)
    Sensitivity kernels for finite-frequency surface waves, Annual Report 2002, Research School of Earth Sciences, Australian National University.
  8. Yoshizawa K. (2003)
    New approaches for surface wave tomography incorporating finite frequency effects, Monthly Chikyu, 25, 524-529. (in Japanese)
  9. Yoshizawa K. (2003)
    Seismology and Physics of the Earth's Interior, IUGG report "Geosciences: The Future", 11-21.
  10. Yoshizawa K. (2003)
    Societal Impact, IUGG report "Geosciences: The Future", 95-100.
  11. Isse T., Yoshizawa K., Shiobara H., Shinohara M., Nakahigashi K., Mochizuki K., Sugioka H., Suetsugu D., Oki S., Kanazawa T. and Fukao Y. (2005)
    3-D shear wave speed structure beneath the Philipine Sea plate using seismograms recorded by islands and ocean bottom seismometer stations, Frontier Research on Earth Evolution vol. 2: IFREE report for 2003-2004.
  12. Yoshizawa K (2005)
    Multiple-orbit surface waves generated by the 2004 Great Sumatra Earthquake, Nayihuru, 49, 6. (in Japanese)
  13. Osada K., Yoshizawa K. and Yomogida K. (2005), Geometry of upper boundary of the Pacific plate beneath the Hokkaido region using ScSp phase, Proc. Symp. Stagnant Slab Project, 16-19. (in Japanese)
  14. Yoshizawa K. and Kennett B.L.N. (2005), Retrieving three-dimensional anisotropic structure in the upper mantle: Application to the Australasian region, Proc. Symp. Stagnant Slab Project, 20-23. (in Japanese)
  15. Isse T., Yoshizawa K., Shiobara H., Shinohara M., Nakahigashi K., Mochizuki K., Sugioka H., Suetsugu D., Oki S., Kanazawa T. and Fukao Y. (2005)
    Three-dimensional shear wave structure beneath the Philippine Sea plate from ocean bottom broadband seismic array, Proc. Symp. Stagnant Slab Project, 24-27. (in Japanese)
  16. Isse T., Suetsugu D., Shiobara H., Sugioka H., Yoshizawa K., Kanazawa T. and Fukao Y. (2005)
    3-D shear wave speed structure of the upper mantle beneath the South Pacific superswell using BBOBS data, Proc. Symp. Stagnant Slab Project, 31-34. (in Japanese)
  17. Litvina E., Yoshizawa K. and Yomogida K. (2005)
    Surface-wave tomography of the north-western Pacific: Preliminary results, Proc. Symp. Stagnant Slab Project, 66-69.
  18. Takezoe H., Yoshizawa K. and Yomogida K. (2005)
    Rayleigh wave phase velocity distribution in the Japanese islands estimated from array analysis, Proc. Symp. Stagnant Slab Project, 70-72. (in Japanese)
  19. Yoshizawa K. (2006)
    Multi-orbit surface waves generated by the 2004 great Sumatra earthquake, Geophysical Bulletin of Hokkaido University, 69, 15-21. (in Japanese with English abstract)
  20. Osada K., Yoshizawa K. and Yomogida K. (2006)
    Upper boundary of the Pacific plate subducting under Hokkaido, Japan, estimated from ScSp phase, Geophysical Bulletin of Hokkaido University, 69, 135-146. (in Japanese with English abstract)
  21. Litvina, E., Yoshizawa, K. and Yomogida, K. (2006)
    S-wave velocity structure beneath the north-western Pacific from surface wave tomography, Abstracts for 5-th Biennial Workshop on Subduction Processes emphasizing the Japan-Kuril-Kamchatka-Aleutian Arcs, 101-104.
  22. Yoshizawa K. (2008)
    Seismic waves generated by North Korean nuclear test on October 9, 2006, Geophysical Bulletin of Hokkaido University, 71, 39-48. (in Japanese with English abstract)
  23. Cetinol, T. and Yoshizawa, K. (2008)
    Surface wave phase velocity distribution of Turkey, Bull. Int. Inst. Seism. Earthq. Eng., 42, 49-54.

Conference Abstracts:

International Conference

  1. Yoshizawa K., Yomogida K. and Tsuboi S. (1997)
    Higher-order heterogeneity in the upper mantle inferred from Rayleigh-wave polarization data, International Symposium of Ocean Hemisphere Project, Kisarazu, Japan.
  2. Yoshizawa K., Yomogida K. and Tsuboi S. (1997)
    Higher-order structure in the upper mantle by Rayleigh wave polarization data, AGU FALL Meeting, San Francisco, USA.
  3. Yoshizawa K. and Kennett B.L.N. (2001)
    Extending surface wave tomography, OHP/ION Joint Symposium, Yamanashi, Japan.
  4. Kennett B.L.N. and Yoshizawa K. (2001)
    Reconciling global and regional surface wave tomography, European Union of Geosciences Meeting, Strasbourg, France.
  5. Yoshizawa K. and Kennett B.L.N. (2001)
    A new approach for surface wave tomography I: Principles, IAGA-IASPEI Joint Assembly, Hanoi, Vietnam.
  6. Yoshizawa K. and Kennett B.L.N. (2001)
    A new approach for surface wave tomography II: Applications, IAGA-IASPEI Joint Assembly, Hanoi, Vietnam.
  7. Yoshizawa K. and Kennett B.L.N. (2001)
    Surface wave tomography: A three-stage approach, AGU FALL Meeting, San Francisco, USA.
       (Won an Outstanding Student Paper Award!    ）
  8. Kennett B.L.N., Yoshizawa K. and Debayle E. (2001)
    Inversions for seismic wavespeed and anisotropy beneath the Australian region, AGU Fall Meeting, San Francisco, USA.
  9. Yoshizawa K. and Kennett B.L.N. (2002)
    Sensitivity kernels for finite-frequency surface waves, AGU Fall Meeting, San Francisco, USA.
  10. Fishwick S., Kennett B.L.N. and Yoshizawa K. (2002)
    Augmented surface wave tomography for the Autralasian region, AGU Fall Meeting, San Francisco, USA.
  11. Yoshizawa K. (2003)
    3-D sensitivity kernels for finite-frequency surface waves and differential waveforms, EGS-AGU-EUG Joint Meeting, Nice, France.
  12. Yoshizawa K. (2003)
    3-D waveform sensitivity kernels for surface waves, IUGG General Assembly, Sapporo, Japan.
  13. Yoshizawa K. (2003)
    The future of seismology and physics of the Earth's interior, IUGG General Assembly, Sapporo, Japan.
  14. Yoshizawa K. (2003)
    Societal implications of geosciences, IUGG General Assembly, Sapporo, Japan.
  15. Yoshizawa K. and Kennett B.L.N. (2004)
    On resolution of surface wave tomography: Geometrical rays and finite-width rays, AGU Fall Meeting, San Francisco, USA.
  16. Isse T., Yoshizawa K., Shiobara H., Shinohara M., Nakahigashi K., Mochizuki K., Sugioka H., Suetsugu D., Kanazawa T. and Fukao Y. (2004)
    3-D Shear Wave Speed Structure Beneath the Philippine Sea Plate, AGU Fall Meeting, San Francisco, USA.
  17. Yoshizawa, K. and Kennett, B.L.N. (2005)
    3-D SH and SV wave speed structures and polarization anisotropy in the Autralian region, IASPEI General Assembly Abstract, 997.
  18. Isse, T., Suetsugu, D., Shiobara, H., Sugioka, H., Yoshizawa, K., Kanazawa, T., Fukao, Y. (2005)
    3-D upper mantle shear wave speed structure beneath the South Pacific Superswell by a BBOBS array, Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract V31F-08.
  19. Goes, S. Simons, F. and Yoshizawa, K. (2005)
    Seismic constraints on temperature of the Australian uppermost mantle, Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract T13A-0451.

Japanese Domestic Conference

  1. Yoshizawa K., Yomogida K. and Tsuboi S. (1997)
    Global seismic tomography by polarization anomalies of long-period Rayleigh waves, Abstracts, Japan Earth and Planet. Sci. Joint Meeting, 37. Nagoya, Japan (in Japanese)
  2. Yoshizawa K., Yomogida K. and Tsuboi S. (1997)
    Phase velocity distribution by Rayleigh wave polarization anomaly : the effect of mis-orientation of stations, Programs and Abstracts, Seism. Soc. Japan Fall Meeting, P141. Hirosaki, Japan (in Japanese)
  3. Yoshizawa K., Yomogida K. and Tsuboi S. (1998)
    Comparison of Rayleigh wave phase velocity distribution by phase data with that by polarization data, Abstracts, Japan Earth and Planet. Sci. Joint Meeting, A59-A60. Tokyo, Japan (in Japanese)
  4. Yoshizawa K. and Yomogida K. (1998)
    Polarization anomaly of long-period P wave: Effect of high-velocity slabs?, Programs and Abstracts, Seism. Soc. Japan Fall Meeting, P106. Fukui, Japan (in Japanese)
  5. Yoshizawa K. and Kennett B.L.N. (2000)
    The evaluation of the surface-wave Fresnel zone based on the ray tracing in laterally heterogeneous media, Abstracts, Japan Earth and Planet. Sci. Joint Meeting, Sd-P005. Tokyo, Japan (in Japanese)
  6. Yoshizawa K.Kennett, B.L.N. (2002)
    A new approach for surface wave tomography I: Principle, Abstracts, Japan Earth and Planet. Sci. Joint Meeting, Tokyo, Japan (in Japanese)
  7. Yoshizawa K.Kennett, B.L.N. & Debayle, E. (2002)
    A new approach for surface wave tomography II: Application to the Australian region, Abstracts, Japan Earth and Planet. Sci. Joint Meeting, Tokyo, Japan (in Japanese)
  8. Yoshizawa K. and Kennett B.L.N. (2002)
    Sensitivity kernels for finite-frequency surface waves, Programs and Abstracts, Seism. Soc. Japan Fall Meeting, Yokohama, Japan (in Japanese)
  9. Yoshizawa K. (2003)
    Development of 3-D waveform sensitivity kernels for surface waves, Japan Earth and Planet. Sci. Joint Meeting, Makuhari, Japan (in Japanese)
  10. Yoshizawa K. and Kennett, B.L.N. (2004)
    On resolution of surface wave tomography: Geometrical rays and finite-width rays, Japan Earth and Planet. Sci. Joint Meeting, Makuhari, Japan (in Japanese)
  11. Osada K., Yoshizawa K. and Yomogida K. (2004)
    Geometry of the Pacific Plate beneath the Hokkaido region estimated from ScSp phase, Seism. Soc. Japan Fall Meeting, Fukuoka, Japan (in Japanese)
  12. Isse T., Yoshizawa K., Shiobara H., Shinohara M., Nakahigashi K., Mochizuki K., Sugioka H., Suetsugu D., Kanazawa T. and Fukao Y. (2004)
    3-D Shear Wave Speed Structure Beneath the Philippine Sea Plate, Seism. Soc. Japan Fall Meeting, Fukuoka, Japan (in Japanese)
  13. Yoshizawa, K. (2005)
    Multi-orbit surface waves excited by the great Sumatra earthquake and directivity effects of finite moving source, Japan Earth Planet. Sci. Meeting Abstracts, J113-P014.
  14. Osada, K., Yoshizawa, K. and Yomogida, K. (2005)
    Geometry of the upper boundary of the Pacific plate beneath the Hokkaido region, Japan Earth Planet. Sci. Meeting Abstracts, I076-005.
  15. Takezoe, H., Yoshizawa, K. and Yomogida, K. (2005)
    Measurements of Rayleigh wave phase velocity by the multi-station method, Japan Earth Planet. Sci. Meeting Abstracts, I021-P022.
  16. Isse, T., Yoshizawa, K., Shiobara, H., Shinohara, H., Nakahigashi, K., Mochizuki, K., Sugioka, H., Suetsugu, D., Kanazawa, T. and Fukao, Y. (2005)
    3-D shear wave speed structure beneath the Philippine Sea plate, Japan Earth Planet. Sci. Meeting Abstracts, I076-002.
  17. Yoshizawa, K. and Kennett, B.L.N. (2005)
    3-D SH and SV wave speed structures and polarization anisotropy in the Australian region, Seism. Soc. Japan Fall Meeting Abstracts, C088.
  18. Takezoe, H., Yoshizawa, K. and Yomogida, K. (2005)
    Rayleigh-wave phase velocity distribution in the Japanese islands by the multi-station method, Seism. Soc. Japan Fall Meeting Abstracts, B033.
  19. Isse, T., Suetsugu, D., Shiobara, H., Sugioka, Y., Yoshizawa, K., Kanazawa, T. and Fukao, Y. (2005)
    3-D upper mantle shear wave speed structure beneath the South Pacific super swell by BBOBS array, Seism. Soc. Japan Fall Meeting Abstracts, C084.
  20. Litvina E., Yoshizawa K. and Yomogida Y. (2006)
    Lithospheric structure in the north-western Pacific region from surface wave analysis, Japan Geoscience Union Meeting Abstracts, I222-002.
  21. Takezoe H., Yoshizawa K. and Yomogida Y. (2006)
    Rayleigh-wave phase speed distribution beneath the Japanese islands: A multi-station approach, Japan Geoscience Union Meeting Abstracts, S206-019.
  22. Isse T., Yoshizawa K., Shiobara H., Sugioka H., Suetsugu D., Kanazawa T. and Fukao Y. (2006)
    Phase speed structure beneath the Pacific Ocean using land and BBOBS station data, Japan Geoscience Union Meeting Abstracts, I222-P019.

Last updated: May, 2010