HR: 1330h
AN: S52B-0137    [PDF]
TI: Effects of Differences in Subsurface Structural Models on Synthetic Ground Motion During The 1923 Kanto Earthquake
AU: Yamanaka, H
EM: yamanaka@depe.titech.ac.jp
AF: Tokyo Institute of Technology, 4259 Nagatsuta Midori-ku, Yokohama, 226-8502 Japan
AU: * Yamada, N
EM: yamada@egmdpri01.dpri.kyoto-u.ac.jp
AF: DPRI, Kyoto Univ., Gokasho, Uji, 611-0011 Japan
AB: In this study, two 3D grid models for subsurface structure of deep sediments in the Kanto plain, Japan, were constructed for strong motion simulation from geological investigations by Suzuki (1999) and S-wave profiles obtained with microtremor array explorations by Yamada and Yamanaka (2001). We tested the performance of the 3D structure models from comparison between the simulated long-period ground velocities during the 1923 Kanto earthquake using a 3D finite difference technique. The differences between the strong motions are small at sites in the focal region, because the source effects are dominant. However, they become large at sites out of the focal region due to site effects. As these sensitive depend on the 3D structure model, we need considerations of setting up the source model for strong ground motion prediction.
DE: 7212 Earthquake ground motions and engineering
SC: Seismology [S]
MN: 2003 Fall Meeting