Name : KIKUCHI,  Masayuki
            Position : Professor
            Division/Center : Earthquake Information Center
            Research Area : Seismology
            homepage : http://www.eri.u-tokyo.ac.jp/kikuchi/Jkikuchi.html
 
 
 

Research
 

       The complexity of earthquake sources is often modeled in terms of asperities and barriers. In an attempt to extract such a
       heterogeneity, I developed a useful technique to analyse seismic data. So far I have modeled many earthquakes with various sizes
       and depths, using the data recorded at local and global networks of broadband seismographs. The results were summarized as a
       fractal nature of source complexity and an empirical relation between the source duration T and the seismic moment Mo as
       Mo/T**3=1.0 e17 [Nm/s**3]. Recently I have a special concern in the real-time seismology where the information of seismic source
       and strong ground motion is desired to be estimated as soon as possible and utilized for disaster mitigation. Thus, I advised
        Yokohama City to construct high density seismograph network which was set up in 1997, and is now in operation for the purpose of a
       quick decision-making of rescue action. The seismic data recorded at this network are usually used to investigate the micro-zoning of
       strong ground motion.

Publications

K. Kuge, M. Kikuchi, and Y. Yamanaka, Non-double-couple moment tensor of the March 25, 1998, Antarctic earthquake: Composite rupture of en echelon strike slips with long-duration normal faulting, Geophys. Res. Lett., 26, 3401--3404, 1999.

M. Kikuchi, Y. Yamanaka, K. Abe, and Y. Morita, Source rupture processes of the Papua New Guinea earthquake of July 17, 1998 inferred from teleseismic body waves, Earth Planets Space, 51, 1319--1324, 1999.

Y. Yagi, M. Kikuchi, S. Yoshida, and T. Sagiya, Comparison of the coseismic rupture with the aftershock distribution in the Hyuga-nada earthquakes of 1996, Geophys. Res. Lett., 26, 3161--3164, 1999.

S. Tsuboi, M. Kikuchi, Y. Yamanaka, and M. Kanao, The March 25, 1998 Antarctic earthquake (Mw=8.1): Great earthquake caused by postglacial rebound, Earth Planets Space, 52, 133--136, 2000.

K. Koketsu and M. Kikuchi, Propagation of Seismic Ground Motion in the Kanto Basin, Japan, Science, 288, 1237--1239, 2000.

Y. Yagi and M. Kikuchi, Source rupture process of the Kocaeli, Turkey, earthquake of August 17, 1999, obtained by joint inversion of near-field data and teleseismic data, Geophys. Res. Lett., 27, 1969--1972, 2000.

M. Kikuchi, Y. Yagi, and Y. Yamanaka, Source process of the Chi-Chi, Taiwan, earthquake of September 21, 1999 inferred from teleseismic body waves, Bull. Earthq. Res. Inst., 75, 1--13, 2000.