A hybrid procedure for the assessment of design basis earthquake ground motions for near-fault conditions

Abstract Near-fault ground motions are strongly influenced by the earthquake faulting mechanism exhibiting distinct long period pulses with amplitudes depending on the orientation of the site with respect to the rupture direction. This paper describes a hybrid procedure developed for the assessment of the design-basis ground motion for important engineering structures near major faults. The procedure relies on the combination of the deterministically obtained low frequency (DC-1 Hz) ground motion with stochastically simulated high frequency components. A descriptive example, produced as part of a 1997 study of the seismic hazard assessment of a port facility in Izmit Bay area, is provided to illustrate the application of this procedure. The results have been compared with the near-field strong ground motion data obtained during the 17 August 1999, Kocaeli, Turkey earthquake ( M w =7.4), which struck the very same area where this study had been conducted.

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