Sanshiro Suzuki

Simulation of near source ground motion and its characteristics

Abstract It is fact that the severe ground motions of shear waves have a strong effect on the dynamic behavior of buildings and civil structures. We simulate near source strong motions of a pure shear wave and synthesize small motions, using the parameters based on the recorded accelerograms at the site that is regarded as a base rock in the Osaka basin, Japan. By making use of a stochastic technique, we can easily introduce higher frequency contents in the motions and apply the technique to the synthesis of small waves regarding as a green function. We also introduce to the analysis the useful relationships among the time duration T d , the seismic moment M 0 , the corner frequency f c and the high cutoff frequency f max which were regressed by a simple representation scheme. Considering two active faults that may affect severe damage on buildings and civil structures, we try to predict strong ground motions in Osaka basin and show the characteristics of them.

Simulation of strong ground motions based on recorded accelerograms and the stochastic method

Abstract Considering the strong influence of severe ground motions of shear waves on the dynamic behavior of buildings and civil structures, these shear wave motions are simulated by using the recorded accelerograms under the surface of the ground which is regarded as a base rock in Osaka, Japan, and by using the stochastic method which can easily introduce higher frequency contents in the motions. The relationships among the seismic moment M 0 , the corner frequency ƒ c and the high cutoff frequency ƒ max were regressed by a simple representation scheme. The agreement of both recorded and analytical accelerograms are demonstrated and the comparison of both spectra are examined.