A method to estimate phase spectrum taking into account the source, path and site effects

摘要

Modeling the phase of earthquake ground motion is important for synthesizing designground motion consistent with the given response spectrum. This paper presents a simplemethod to model phase characteristics of earthquake motion using the concept of group delay time.The phase spectrum is derived by integrating this group delay time. The time delay caused by rupturepropagation on fault plane which is assumed to be expressed by a train of impulses. The effectof transmitting path and amplification effect due to the local soil condition on phase is assumed tobe given by minimum phase function.