Identification of a Site-Specific Ground Motion Model

by T. Hamamoto, Ohbayashi Corp, Japan,
A. H. -S. Ang, Ohbayashi Corp, Japan,
Y. Takeuchi, Ohbayashi Corp, Japan,

Document Type: Proceeding Paper

Part of: Structural Safety and Reliability


The power spectral density and envelope function of earthquake ground accelerations at a site of interest are determined with the aid of system identification based on information predicted by a kinematic fault model and those observed at or near the site. The ground motion model to be identified is constructed by combining the low-frequency dynamics of seismic waves reproduced by the fault model in a deterministic way and the high-frequency dynamics generated by passing white noise series through an ARMA filter. Numerical examples are presented using the actual ground accelerations observed at stations and the corresponding source parameters inferred by seismologists in the 1980 East off Izu Peninsula earthquake (M=6.7).

Subject Headings: Ground motion | Geological faults | Frequency response | Earthquakes | Structural models | Power spectral density | Seismic waves | Stochastic processes

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