Abstract
The purpose of this study is to investigate the relation between the objective function and the accuracy in identification of the parameters in the horizontally laminated ground model using vertical array records of ground motions. The numerical analysis of the identification is generally carried out in the frequency domain, supposing one-dimensional multiple reflection of shear wave. The spectral ratio of ground motions is often used as the target. And the parameters of the ground model are to be optimized so as to minimize the residual between the spectral ratio and the transfer function of the ground model. However, the bad influence of smoothing of spectra has often been indicated. On the other hand, the numerical analysis has recently been applied in which the time history of recorded ground motions is the target. In this paper, a new objective function is proposed, and the accuracy of identification, the shape of objective functions and the ifluence of initial values are compared.
