Macro-Spatial and Inter-Period Correlation of Spectral Acceleration Found In Simulated Ground Motion

Abstract eng:
In conventional probabilistic seismic hazard analysis (PSHA), an empirical ground motion prediction equation (GMPE) has been widely used to predict ground motion intensity measures. On the other hand, ground motion simulation techniques, e.g. the stochastic Green's function method, are increasingly used in a practical design procedure, which predicts a ground motion time history instead of ground motion intensity measures. For multi-site seismic hazard analysis and seismic risk analysis for spatially-distributed buildings and infrastructure, a macrospatial correlation as well as an inter-period correlation of ground motions is important. In this paper, residual of an empirical GMPE is investigated by numerical simulation, especially focusing on correlation structures in residual of spectral acceleration. Correlation at longer period (T=3.0s) is comparable between simulated and observed ground motion both in spatial and inter-period correlation, while correlation at shorter period (T=0.5, 1.0s) is not comparable to each other. This indicates that correlation at longer period can be explained by these two factors, while correlation at shorter period is considered due to different factors, such as effects of shallow soils etc.

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