HR: 1330h
AN: S52A-0117    [PDF]
TI: Modeling of Long-period Ground Motions from Moderate-size Earthquake in Kinki Area, Japan
AU: * Yamada, N
EM: yamada@egmdpri01.dpri.kyoto-u.ac.jp
AF: DPRI, Kyoto Univ., Gokasho, Uji, 611-0011 Japan
AU: Iwata, T
EM: iwata@egmdpri01.dpri.kyoto-u.ac.jp
AF: DPRI, Kyoto Univ., Gokasho, Uji, 611-0011 Japan
AB: The Kobe and Osaka metropolitan areas are located on the Osaka sedimentary basin in Japan where has repeatedly suffered from heavy damage caused by subduction zone earthquakes with M8 class, although it has more than 100km from the source region. As very high probability is estimated for occurrence of the next earthquakes, it is an emergent subject to characterize source and propagation-path models for predicting strong ground motions. Especially, estimation of response of high-rise buildings that were not existing during the last subduction earthquakes in this area, against the ground motions is one of the quite important issues for seismic disaster mitigation. We have started to simulate long-period (2 to 10s) ground motions of M5 class earthquakes, occurred in the source area of the hypothetical subduction earthquake at strong-motion and broad-band seismic stations in the area using a 1D crustal structure model. Although simulated velocity ground motions with a starting velocity model seem to be able to reproduce the S-wave and some later phases at the bedrock stations between the source and Osaka basin, frequency characteristics and duration of the simulated ground motions are different from those of observations. We are improving the crustal structure model by introducing a 3D crustal structure with referring to ground motion simulations.
DE: 7212 Earthquake ground motions and engineering
SC: Seismology [S]
MN: 2003 Fall Meeting