| 集集地震近断层地震动频谱特性 |
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| 引用本文： | 徐龙军,谢礼立.集集地震近断层地震动频谱特性[J].地震学报,2005,27(6):656-665. |
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| 作者姓名： | 徐龙军 谢礼立 |
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| 作者单位： | 中国哈尔滨,150090,哈尔滨工业大学土木工程学院;中国哈尔滨,150090,哈尔滨工业大学土木工程学院;中国哈尔滨,150080,中国地震局工程力学研究所 |
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| 基金项目： | 黑龙江省自然科学基金，高等学校博士学科点专项科研项目 |
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| 摘 要： | 利用5个反映地震动频谱特征的周期(反应谱卓越周期Tp, 平滑化反应谱卓越周期To, 傅氏幅值谱平均周期Tm, 等效速度脉冲周期Tv和拟速度反应谱卓越周期Tpv)， 对集集地震的近断层三分量地震动进行研究. 结果表明, 上盘地震动的频谱周期小于下盘地震动; Tp小于To和Tm， 且Tp反映的三分量之间的关系与To和Tm不同； 在地表断裂带的北端，Tv和Tpv所反映的近断层地震动长周期分量的频谱特征， 与走滑断层中方向性效应作用的规律相类似. 得出的定性或定量结论可以为近场抗震设计谱的建立与地震危险性区划研究提供参考.
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| 关 键 词： | 频谱 方向性效应 上盘效应 集集地震 |
| 文章编号： | 0253-3782(2005)06-0656-10 |
| 修稿时间： | 2004年7月26日 |
CHARACTERISTICS OF FREQUENCY CONTENT OF NEAR-FAULT GROUND MOTIONS DURING THE CHI-CHI EARTHQUAKE |
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| Xu Longjun,Xie Lili.CHARACTERISTICS OF FREQUENCY CONTENT OF NEAR-FAULT GROUND MOTIONS DURING THE CHI-CHI EARTHQUAKE[J].Acta Seismologica Sinica,2005,27(6):656-665. |
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| Authors: | Xu Longjun Xie Lili |
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| Abstract: | The frequency content of earthquake ground motion is very important because it affects the dynamic response of structural systems. In the paper, we use five scalar parameters (the response spectral predominant period Tp, smoothed spectral predominant period T,,, Fourier amplitude spectral mean period Tm . equivalent pulse period Tv, and the pseu-do-velocily spectral predominant period Tpv) reflecting the characteristics of frequency content of strong ground motion to examine the near-fault three-component motions during the 1999 Chi-Chi earthquake. The result indicates that the frequency content of near-fault motions at the hanging wall is less than 1hat at the foot wall; Tp shows a smaller value than that of To and Tm and it emerges a reverse relation of three-component motions as compared with that of To and Tm;Tv and Tpv of the near-fault motions at the north end of the rupture display a similar trend to that generated by the rupture directivity effect of strike-slip faulting. We therefore conclude that these observations are useful in the formulation of near-fault design spectra for seismic codes and in zoning studies in seismic hazard. |
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| Keywords: | frequency content directional effect top-wall effect Chi-Chi earthquake |
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