| 时频分析方法及在地震波谱研究中的应用 |
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| 引用本文： | 张帆,钟羽云,朱新运,熊丹,周昕. 时频分析方法及在地震波谱研究中的应用[J]. 地震地磁观测与研究, 2006, 27(4): 17-22 |
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| 作者姓名： | 张帆 钟羽云 朱新运 熊丹 周昕 |
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| 作者单位： | 中国,合肥,230026,中国科学技术大学地球与空间科学学院;中国,杭州,310013,浙江省地震局;中国,杭州,310013,浙江省地震局 |
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| 摘 要： | 地震波是一种非平稳信号,傅立叶分析已不适合。时频分析能对非平稳信号进行分析,并给出地震波信号能量的时间-频率分布。但是在时频分析时,存在交叉干扰项,会带来一些错误的信息。本文讨论了波恩-约旦(Born-Jordan)时频分布、乔伊-威廉斯(Choi-Williams)时频分布、赵-阿特拉斯-马克斯(Zhao-Atlas-Marks)时频分布3者之间抑制和消除交叉干扰项的特点,认为赵-阿特拉斯-马克斯(Zhao-Atlas-Marks)时频分布抑制交叉干扰项的效果和时频聚集性更好,更适合于分析地震波。
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| 关 键 词： | 非平稳信号 时频分布 数字化地震波 交叉干扰项 时变频谱 |
| 文章编号： | 1003-3246（2006）04-0017-06 |
| 收稿时间： | 2006-02-27 |
| 修稿时间： | 2006-02-27 |
Application of time-frequency analysis to seismic wave spectrum research |
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| Zhang Fan,Zhong Yuyun,Zhu Xinyun,Xiong Dan,Zhou Xin. Application of time-frequency analysis to seismic wave spectrum research[J]. Seismological and Geomagnetic Observation and Research, 2006, 27(4): 17-22 |
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| Authors: | Zhang Fan Zhong Yuyun Zhu Xinyun Xiong Dan Zhou Xin |
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| Affiliation: | 1 School of Earth and Space Science of University of Science and Technology of China, Hefei 230026, China 2 |
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| Abstract: | Earthquake waveform signal is a kind of nonstationary signal, which can not be analyzed suitably by classical Fourier analysis. Time-frequency analysis can analyze nonstationary signal including earthquake signal. But the existence of cross distribution is inevitable. The characteristic of weakening the cross distribution of three kind of time-frequency presentation, which are Born-Jordan, Choi-Williams, Zhao-Atlas-Marks time-frequency presentation, is discussed in this article. In conclusion, Zhao-Atlas-Marks time-frequency presentation has weakest cross distribution, and is most suitable for analyzing earthquake waveform signal. |
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| Keywords: | nonstatonary signal time-frequency presentation digital earthquake wave cross distribution |
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