| S变换在面波去噪中的应用r |
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| 引用本文： | 李玲利,王清东,沈文渊,朱良保.S变换在面波去噪中的应用r[J].地震学报,2012,34(6):830-840. |
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| 作者姓名： | 李玲利 王清东 沈文渊 朱良保 |
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| 作者单位： | 1) 中国合肥230026中国科学技术大学 2) 中国合肥230031安徽省地震局 3) 中国武汉430079武汉大学测绘学院地球物理系 4) 中国北京100190中国科学院电子学研究所 5) 中国武汉 430079 武汉大学地球空间环境与大地测 |
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| 基金项目： | 国家自然科学基金，中央高校基本科研业务费专项资金资助 |
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| 摘 要： | S变换是一种用于分析非平稳信号的时频变换方法, 可以很好地刻画地震信号的时频特性. 本文将S变换用于地震面波数据的噪声去除中, 首先介绍了S变换的理论基础, 然后设计了时频滤波和阈值滤波两种方法, 分别对天然地震面波数据和背景噪声数据进行去噪处理, 并与相位匹配滤波进行了比较． 结果表明, 面波数据经S变换去噪后, 群速度频散曲线的短周期部分得到改善, 能够连续追踪至6 s左右, 但长周期部分出现了缺失; S变换去噪的效果优于相位匹配滤波, 两者相结合会得到更加理想的结果．
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| 关 键 词： | S变换 时频滤波 阈值滤波 频散曲线 相位匹配滤波 |
Application of S transform in surface wave denoising |
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| Li Lingli
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Wang Qingdong
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Shen Wenyuan
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Zhu Liangbao.Application of S transform in surface wave denoising[J].Acta Seismologica Sinica,2012,34(6):830-840. |
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| Authors: | Li Lingli Wang Qingdong Shen Wenyuan Zhu Liangbao |
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| Institution: | 1) University of Science and Technology of China, Hefei 230026, China2) Earthquake Administration of Anhui Province, Hefei 230031, China3) Department of Geophysics, School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China4) Institute of Elect |
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| Abstract: | S transform is a time-frequency transformation method used to analyze non-stationary signals, and it can depict the time-frequency characteristics of seismic signals very well. In this paper, S transform is used to remove noises in seismic surface wave data. The theoretical basis of S transform is introduced first, and then time-frequency filter and threshold filter are designed for processing ambient noise data and surface wave data of natural earthquakes, respectively. The results show that the short period part of group velocity dispersion curve of surface wave data is improved after S transform denoising, and the group velocity can be tracked continuously to about 6 s, but the long period part is missing. The effect of S transform is better than that ofphase match filter (PMF), and the combination of the two will get more ideal results. |
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