| 山西运城振动事件S变换时频分析 |
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| 引用本文： | 李丽,刘剑,李自红,闫亚荣.山西运城振动事件S变换时频分析[J].地震地磁观测与研究,2018,39(2):77-83. |
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| 作者姓名： | 李丽 刘剑 李自红 闫亚荣 |
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| 作者单位： | 1. 中国太原 030021 山西省地震局;2. 中国山西 030025 太原大陆裂谷动力学国家野外科学观测研究站;3. 中国山西 030024 太原理工大学矿业工程学院;4. 中国山西 044000 运城市防震减灾中心 |
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| 基金项目： | 山西省地震局青年科研项目（项目编号：SBK-1623）；2016年度震情跟踪定向工作任务（项目编号：2016010106） |
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| 摘 要： | 基于S变换，对2005年以来山西南部运城及其附近地区的振动事件波形进行时频分析，并与山西南部地区的天然地震、爆破和塌陷地震波谱特征进行对比分析。结果表明：天然地震一般S波携带能量较大，衰减较慢，震相高低频成分呈现均匀分布；一般近台记录的人工爆破P波比S波发育，能量衰减较快，震相急促短暂；塌陷地震波列能量随时间和频率的展布相对集中，一般分布在频率较低区域；振动事件震相简单，被不同台站记录的波形能量优势分布及频率分布范围差异较大，衰减特征不明显。据此，基本可以排除山西南部及附近区域的振动事件为天然地震、爆破和塌陷事件的可能。
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| 关 键 词： | 振动事件 S变换 时频分布 |
Time-frequency analysis of S-transform in vibration events of Shanxi |
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| Li Li,Liu Jian,Li Zihong,Yan Yarong.Time-frequency analysis of S-transform in vibration events of Shanxi[J].Seismological and Geomagnetic Observation and Research,2018,39(2):77-83. |
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| Authors: | Li Li Liu Jian Li Zihong Yan Yarong |
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| Institution: | 1. Shanxi Earthquake Agency, Taiyuan 030021, China;2. National Continental Rift Valley Dynamics Observatory of Taiyuan, Shanxi Proveince 030025, China;3. College of Mining Engineering, Taiyuan University of Technology, Shanxi Proveince 030024, China;4. Yuncheng Earthquake Disaster Prevention Center, Shanxi Province 044000, China |
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| Abstract: | Based on the S-transform, the time-frequency analysis of the vibration event waveforms from the southern Shanxi Province to the Shanxi-Shaanxi border region was carried out, and the results were compared with the characteristics of natural earthquake, blasting and collapse seismic spectra in south of Shanxi Province. The results showed that the vibration events are simple and the source features do not accord with the double-couple point source model. The energy of the vibration wave train with frequency and time distributed generally from 3 Hz to 20 Hz, the difference between energy distribution and frequency distribution range is large in different stations, and energy decayed faster. Based on the waveform characteristics, energy attenuation and time-frequency distribution of different event types, it is concluded that this vibration event is not a single point source event. The vibration source has a certain distribution range and movement direction, and the possibility of that the vibration events belong to natural earthquake, blasting or collapse earthquake can be basically excluded. |
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| Keywords: | vibration event S-transform time-frequency distribution |
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