HR: 1330h
AN: S52A-0111    [PDF]
TI: Characterization of Dynamic Source Parameters for Strong Motion Prediction
AU: * Iwata, T
EM: iwata@egmdpri01.dpri.kyoto-u.ac.jp
AF: DPRI, Kyoto Univ., Gokasho, Uji, 611-0011 Japan
AU: Sekiguchi, H
EM: Haruko.Sekiguchi@aist.go.jp
AF: AFRC, GSJ/AIST, Chuo 7, Higashi 1-1-1, Tsukuba, 305-8567 Japan
AU: Miyake, H
EM: hiroe@eri.u-tokyo.ac.jp
AF: ERI, Univ. of Tokyo, Yayoi 1-1-1, Bunkyo, Tokyo, 100-0032 Japan
AU: Zhang, W
EM: wenbo@egmdpri01.dpri.kyoto-u.ac.jp
AF: DPRI, Kyoto Univ., Gokasho, Uji, 611-0011 Japan
AU: Miyakoshi, K
EM: ken@geor.or.jp
AF: Geo. Res. Inst., Itachibori 4-3-2, Nishi-ku, Osaka, 550-0012 Japan
AB: Heterogeneous slip characterization of inland crustal earthquakes (Mw5.4-7.6) shows a scaling relation between total area of asperity, which has rather larger slip than the total area, and seismic moment from source inversion results using strong motion data (e.g. Somerville et al., 1999; Miyakoshi et al., 2002). Irikura and Miyake (2001) proposed characterized source model based on this scaling relation for strong motion prediction. The availability of the characterized source models has been proved through the strong motion simulation in near-source area in the broadband frequency band (BB) for e.g., the 1995 Kobe (Kamae and Irikura, 1997) and for the 2000 Tottoriken-Seibu (Ikeda et al., 2002), Japan, earthquakes. In those simulations, they assumed stress drops only for the asperities by forward simulation of the high frequency contents of the records. When constructing a characterized source model for BB strong motion, we need rules to set stress parameters of the characterized source model. We examine dynamic source parameters by mapping method of spatio-temporal shear-stress distribution on the fault plane from a spatio-temporal slip distribution from kinematic waveform inversion (Bouchon, 1997). The dynamic source parameters averaged over on- and off-asperity areas are estimated. Average effective stress values of on- and off- asperity areas are estimated as 10-30MPa and about 5MPa for the 1995 Kobe, the 1999 Chichi, Taiwan, the 1999 Kocaeli, Turkey, and the 2000 Tottoriken-Seibu earthquakes. Stress parameters on the asperities are slightly increasing with asperity depth. Stress parameters on the asperities coincide with the ones that were used for forward ground motion modelings. Characterization of stress parameters contributes the development of characterized source model.
DE: 7209 Earthquake dynamics and mechanics
DE: 7212 Earthquake ground motions and engineering
DE: 7215 Earthquake parameters
SC: Seismology [S]
MN: 2003 Fall Meeting