Earthquake Research Institute, University of Tokyo
Applied Seismology Laboratory
Prof. Kazuki Koketsu
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Research Theme

An earthquake is a phenomenon, which begins at its source with fault ruture and is completed after the propagation of generated “seimic shaking” through velocity structures and the excitation of seismic ground motions/seismic waves and deformations at a site (Fig. 1). This laboratory works for these seismic ground motions/seismic waves, and ground deformations based on the research theme:
"Think Seismic Shaking Scientifically."
Although both seismic ground motions and seismic waves represent “seimic shaking”, it can be common that shakings in the near-field of an earthquake source are called seismic ground motions, and those in the far-field are called seismic waves. Among them, our principal research subject is seismic ground motion including ground deformation, such as strong shaking causing disasters (strong ground motion) and long-period ground motion. In 2018, the book entitled "Physics of Seismic Ground Motion" was published to explain the equations and methods used in analyses and computations of seismic ground motion.

Fig. 1. Seismic shaking and seismic ground motions/seismic waves (based on Taga, 1982).

Objectives of the Laboratory

Publications from the Laboratory

Research Projects

  • Running Research Projects
    • Integrated Research on Great Earthquakes and Disaster Mitigation in Nepal Himalaya (JST & JICA, 2015∼2021: PI)
    • Communication of the long-term hazards of seismic ground motion and tsunami (MEXT, 2014∼2019: PI)
    • Seismic Kanto Project (2000 supplementary MEXT budget etc., 2000∼: PI)

  • Completed Research Projects
    • Investigation of ground-motion to damage relationship in the Kathmandu Valley from aftershock and microtremor observations (JST, 2015∼2016: PI)
    • Assessment of seismic risk in Istanbul based on the integration of historical seismology and structural engineering (JSPS, 2014∼2015: PI)
    • Seismic resistance of bridges due to a Shuto Chokka earthquake (East Nippon Expressway, 2014∼2016: PI)
    • Development of the next generation ground motion prediction equation (Grant-in-Aid for Scientific Research (A), 2011∼2016: PI)
    • Support Program for Long-Period Ground Motion Hazard Maps (MEXT, 2010∼2011: PI)
    • Investigation of Propagation Characteristics in Design Base Ground Motions (JNES, 2010∼2012: PI)
    • Information Network for Natural Disaster Mitigation and Recovery (JST & JICA, 2009∼2014: PI in UT)
    • Research on Upgrade of Ground Motion Prediction Method (NLIRO, 2009∼2012: PI)
    • Multi-disciplinary Hazard Reduction from Earthquakes and Volcanoes in Indonesia (JST & JICA, 2008∼2012)
    • Strain Concentrated Belts Research Project (MEXT, 2008∼2013)
    • Special Project for Earthquake Disaster Mitigation in Tokyo Metropolitan Area (MEXT, 2007∼2012)
    • Comprehensive Study on Long-Period Ground Motions and Mitigation of Their Urban Disasters (Grant-in-Aid for Scientific Research (C), 2006 & (A), 2007∼2011: PI)
    • Integrated Velocity Structures Database Project (Special Coordination Funds for Promoting Science and Technology, 2006∼2011)
    • JSPS-LIPI Joint Research Project (JSPS, 2007∼2008)
    • Integrated Research Project for Itoigawa-Shizuoka Tectonic Line (MEXT, 2005∼2010)
    • Integrated Research Project for Miyagi-Oki Earthquakes (MEXT, 2005∼2010)
    • Coseismic Stability of Methane Hydrate Exploitation during Giant Earthquakes along Nankai Trough (JOGMEC, 2003∼2005: PI)
    • Special Project for Earthquake Disaster Mitigation in Urban Areas: Theme I (MEXT RR2002, 2002∼2007)
    • Development of the Strong Motion Simulator for Earthquake Disaster Prediction in Urban Areas (JST, 2001∼2004: PI)

Jul. 03, 2004
Jul. 07, 2009
Feb. 20, 2011
May 12, 2017
Dec. 27, 2018