Aspects of characteristics of near‐fault ground motions of the 1999 chi‐chi (Taiwan) earthquake
Aspects of characteristics of near‐fault ground motions of the 1999 chi‐chi (Taiwan) earthquake
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DOI：
10.1080/02533839.2002.9670726
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发表时间：
2002-07
影响因子：
1.1
通讯作者：
Jeen‐Hwa Wang;Ming-Wey Huang;Kou‐Cheng Chen;R. Hwang;Wen-Yen Chang
中科院分区：
文献类型：
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作者：
Jeen‐Hwa Wang;Ming-Wey Huang;Kou‐Cheng Chen;R. Hwang;Wen-Yen Chang
摘要本文首先研究了地震震源平面坐标系下沿断层线沿着分布的九个近断层地震台站的峰值地面加速度（PGA）、峰值地面速度（PGV）和加速度波形谱。结果表明，除一个测站附近断层轨迹变化明显外，沿断层由南向北沿着，近断层PGA值减小，PGV值增大。虽然近断层加速度谱存在着多样性和复杂性，但仍然可以得到一些实质性的结论。震源和场地效应是控制近断层加速度谱沿着断层变化的两个主要因素。场地效应主要作用于高频谱，而震源效应主要作用于低频谱。对于三个分量，平均而言，优势频率的值在上壁中比在底壁中高。
Abstract In this work, we first study the peak ground accelerations (PGA), the peak ground velocities (PGV) and spectra of acceleration waveforms, based on a coordinate system defined on the focal plane of the earthquake, at nine near‐fault seismic stations along the fault trace. Results show that except for a station, near which there is a remarkable change of the fault trace, the near‐fault PGA value decreases and the PGV value increases from south to north along the fault. Although there exist variety and complexity in near‐fault acceleration spectra, some substantial conclusions can still be retrieved. The source and site effects are two major factors in controlling the variation in near‐fault acceleration spectra along the fault. The site effect acts mainly on the high‐frequency spectra, while the source effect on low‐frequency ones. For the three components, the value of the predominant frequency is, on the average, higher in the hanging wall than in the foot wall.