Near-Field Differential Ground Displacement

by A. Zerva, City Coll of the City Univ of New, York, United States,
M. Shinozuka, City Coll of the City Univ of New, York, United States,

Document Type: Proceeding Paper

Part of: Structural Safety and Reliability


An analytical model for the development of differential ground motions in the vicinity of a vertical, strike-slip fault is presented. The model considers a uniform, kinematic source model, but allows the parameters of rupture, namely the dislocation amplitude, the rise time, the rupture velocity and the width of the fault to vary randomly along the length of the fault with an exponential autocorrelation function. The sensitivity of the differential ground motions to the randomness in the source parameters is examined. It is found that randomness in the rise time and the rupture velocity increase the frequency content of the motions, but that the variations in the dislocation amplitude and the fault width do not affect the motions considerably. The effect of the correlation length of the source parameters on the resulting ground motions is also investigated.

Subject Headings: Geological faults | Parameters (statistics) | Displacement (mechanics) | Structural analysis | Ground motion | Kinematics | Correlation | Seismic design

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