| 2008年汶川地震近断层地震动的非平稳特征 |
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| 引用本文： | 谢俊举,温增平,高孟潭,袁美巧,何少林.2008年汶川地震近断层地震动的非平稳特征[J].地球物理学报,2011,54(3):728-736. |
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| 作者姓名： | 谢俊举 温增平 高孟潭 袁美巧 何少林 |
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| 作者单位： | 1. 中国地震局地球物理研究所, 北京 100081;
2. 中国地震局兰州地震研究所,兰州 730000 |
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| 基金项目： | 国家重点基础研究发展计划(973)，地震行业科研专项，地球物理研究所基本科研专项，北京市自然科学基金，国家自然科学基金项目 |
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| 摘 要： | 利用中国强震动台网获得的汶川地震近断层强震动数据,研究汶川地震近断层地震动的强度和频率的非平稳特征,并对其非平稳特征的原因进行初步分析.研究表明近断层地震动强度和频率表现出很强的非平稳特性,这种非平稳特征主要受震源破裂机制、台站方位和局部场地条件的影响.破裂传播正向和反方向上地震动强度和频率的时间过程有显著的不同.在破...
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| 关 键 词： | 地震动 方向性效应 汶川地震 非平稳 近断层 速度脉冲 小波谱 |
| 收稿时间： | 2010-02-03 |
Non-stationary characteristics of near-fault strong motions during the 2008 Wenchuan earthquake |
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| XIE Jun-Ju,WEN Zeng-Ping,GAO Meng-Tan,YUAN Mei-Qiao,HE Shao-Lin.Non-stationary characteristics of near-fault strong motions during the 2008 Wenchuan earthquake[J].Chinese Journal of Geophysics,2011,54(3):728-736. |
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| Authors: | XIE Jun-Ju WEN Zeng-Ping GAO Meng-Tan YUAN Mei-Qiao HE Shao-Lin |
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| Institution: | 1. Institute of Geophysics, China Earthquake Administration,Beijing 100081, China;
2. Institute of Earthquake Science(Lan Zhou), China Earthquake Administration, Lanzhou 730000, China |
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| Abstract: | Using near-fault strong motions from Wenchuan earthquake recorded by the National Strong Motion Observation Network System of China as database, non-stationary characteristics of amplitude and frequency content of strong motions from 2008 Wenchuan earthquake are investigated, and the reason for intense non-stationary characteristics of near-fault strong motions are analyzed. According to this study, non-stationary characteristics of near-fault strong motions are strongly affected by fault rupture mechanism, location of strong motion stations and site conditions. Obvious differences are shown in the time histories of strong motion in the forward and backward direction of the rupture fault. In the forward directivity region, the acceleration time history is characterized by large amplitudes and short durations, the main duration is as short as 15 s, and the predominant period of the acceleration time history is about 0.4 s. Large velocity pulses are shown in the velocity time histories, the period of velocity pulse can be as large as 8 s. In the backward region, the duration of acceleration time history is as long as 90 s, the predominant period is about 0.6 s, and no obvious pulse can be seen in the velocity time history. Wavelet analysis shows that the velocity pulse in the forward directivity region is characterized as intense concentration of energy in a short time and frequency range. A noticeable phenomenon is shown that the period of recorded velocity pulse in Wenchuan earthquake is much larger than the Chi-Chi and Kobe earthquake, as a result of a much larger magnitude for this event. |
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| Keywords: | Ground motion Forward directivity effects Wenchuan earthquake Non-stationary Near-fault Velocity pulse Wavelet spectrum |
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