MODELING OF PHASE CHARACTERISTICS OF STRONG EARTHQUAKE MOTION

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  • 震源・伝播・地点特性を考慮した地震動の位相スペクトルのモデル化
  • シンゲン デンパ チテン トクセイ オ コウリョ シタ ジシンドウ ノ イソウ スペクトル ノ モデルカ

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Abstract

Modeling phase characteristics of earthquake ground motion is important to synthesis a design earthquake motion consistent with the given response spectra. We assume that an earthquake ground motion can be expressed by the convolution of the two time functions; 1) the time delay caused by rupture propagation on the fault plane which is assumed to be expressed by a train of impulses, 2) the effect of path of transmission. This paper presents a simple method to model phase characteristics of earthquake motion using the concept of group delay time. A method to model the group delay time of a train of impulses is proposed. The phase shift due to the transmitting path of seismic wave motion is also expressed by the minimum phase transfer function of its amplitude spectrum.

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