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Toshinori Sato

Geophysics Group

Department of Earth Sciences

Topics

  • Afterslip distribution using poroelastic and viscoelastic media:
    Large earthquakes can cause stress changes in the surrounding crust and mantle, and lead to time-dependent post-seismic deformation. The study of post-seismic deformation and afterslip distribution has become a priority, because data on the afterslip distribution provide information on the stress changes, frictional characteristics, and material properties. We have developed an analysis method for afterslip distribution using poroelastic and viscoelastic media.

  • Ocean drilling project - Kanto Asperity Project (KAP)
    Kanto Asperity Project (KAP) is a proposal for IODP (Integrated Ocean Drilling Program). Our scientific goal is to understand characteristics of three different events (Taisho, Genroku, and slow slip), and to improve earthquake generation models using slow slip events. We propose a deep drilling program for obtaining fault materials and pore pressure data, and a long-term monitoring program for observing several cycles of slow slip events. Now, we start observations of crustal deformation by ocean bottom pressure gauges.

  • Seismic structure and seismicity at ocean ridges and their relation to hydrothermal activity:
    This study investigates relations between ocean ridge spreading systems and hydrothermal systems using a seismic reflection/refraction survey and seismicity observations. We conducted the surveys at the Mariana trough and the central Indian ridge.

Research Subjects

I am studying the following themes for understanding earthquake generation processes.
(1) Seismicity and seismic structure of crust and upper mantle at subduction zones
(2) Development of inversion methods for slip distribution and simulation models for earthquake generation.

 

hiroi

Photo 1: Ocean Bottom Seismograph
Photo 2: Air gun shot for artificial seismic source

Selected publications

  • Sato, T., Mizuno, M., Takata, H., Yamada, T., Isse, T., Mochizuki, K., Shinohara, M. and Seama, N. (2015) Seismic structure and seismicity in the Southern Mariana Trough and their relation to hydrothermal activity. In Subseafloor Biosphere Linked to Hydrothermal Systems: TAIGA Concept, edited by Ishibashi, J., Okino, K. and Sunamura, M., Springer Japan, Tokyo, doi:10.1007/978-4-431-54865-2_18.
  • Lubis, A. M., Hashima, A. and Sato, T. (2013) Analysis of afterslip distribution following the 12 September 2007 southern Sumatra earthquake using poroelastic and viscoelastic media. Geophys. J. Int., 192, 18–37.
  • Shinohara, M., Machida, Y., Yamada, T., Nakahigashi, K., Shinbo, T., Mochizuki, K., Murai, Y., Hino, R., Ito, Y., Sato, T., Shiobara, H., Uehira, K., Yakiwara, H., Obana, K., Takahashi, N., Kodaira, S., Hirata, K., Tsushima, H. and Iwasaki, T. (2012) Precise aftershock distribution of the 2011 off the Pacific coast of Tohoku earthquake revealed by ocean bottom seismometer network. Earth Planets Space, 64,1137–1148
  • Shinohara, M., Yamada, T., Nakahigashi, K., Sakai, S., Mochizuki, K., Uehira, K., Ito, Y., Azuma, R., Kaiho, Y., No, T., Shiobara, H., Hino, R., Murai, Y., Yakiwara, H., Sato, T., Machida, Y., Shinbo, T., Isse, T., Miyamachi, H., Obana, K., Takahashi, N., Kodaira, S., Kaneda, Y., Hirata, K., Yoshikawa, S., Obara, K., Iwasaki, T. and Hirata, N. (2011) Aftershock observation of the 2011 off the Pacific coast of Tohoku Earthquake by using ocean bottom seismometer network. Earth Planets Space, 63, 835–840
  • Lubis, A. M., Isezaki, N. and Sato, T. (2011) Two-dimensional coseismic deformation field of the Sumatra-Andaman earthquake 2004 Mw 9.2 derived from synthetic aperture rader observation. Remote Sensing Letters, 2, 107–116.

Teaching

General Education Course

  • Information Processing
  • Earthquakes and Related Hazards
  • Understanding of Regional Geoscientific Background
  • Basic Laboratory/Field Class of Earth Sciences C

Undergraduate Course

  • Outline of Geodynamics 1
  • Data Processing on Earth Sciences II -1, 2
  • Geophysics III -1, 2
  • Laboratory Class of Geophysics I
  • Laboratory Class of Geophysics II
  • Earth Science Seminar
  • Undergraduate Research

Graduate Course

  • Basic Geodynamics 2
  • Geophysics IV A
  • Geophysics V A
  • Advanced Seminar I
  • Graduate Research I
  • Advanced Seminar II
  • Graduate Research II

Academic Society Membership

  • Seismological Society of Japan
  • American Geophysical Union
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