| 小波阈值法在JCZ系列超宽频带地震仪记录的地震数据中的应用及探讨 |
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| 引用本文： | 王海斌,周云耀,吕永清,向涯.小波阈值法在JCZ系列超宽频带地震仪记录的地震数据中的应用及探讨[J].大地测量与地球动力学,2021,41(3):323-330. |
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| 作者姓名： | 王海斌 周云耀 吕永清 向涯 |
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| 作者单位： | 中国地震局地震研究所地震大地测量重点实验室,武汉市洪山侧路40号,430071 |
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| 基金项目： | 中国地震局地震研究所和地壳应力研究所基本科研业务费专项 |
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| 摘 要： | 为了对JCZ系列超宽频带地震仪采集到的地震数据进行有效去噪，探讨小波阈值法在不同地震数据中去噪的实际效果。首先介绍小波法的基本理论与去噪标准，探讨不同小波基的选取、不同分解、重建尺度与阈值的选取及处理方式对小波阈值法最终去噪效果产生的影响；使用控制变量法，选取武汉水院地震台的记录数据，探讨如何获得较好的去噪效果。为了比较小震和中强震两种情况下相同方法的处理效果，将选择好的小波基与几何尺度用于震例数据去噪发现，在实际地震去噪处理中基于样本数估计选取的阈值具有一定局限性，且相同阈值在不同震级的震例数据中具有不同的去噪结果。最后使用小波阈值对JCZ系列超宽频带地震仪采集到的地震数据进行去噪发现，小波阈值去噪对于P波初动的识别判断也具有一定意义。
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| 关 键 词： | JCZ-1超宽频带地震仪 小波分析 小波阈值去噪 控制变量法 |
Application and Discussion on Wavelet Threshold Method in Seismic Data Recorded by JCZ Series Ultra-Wideband Seismographs |
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| WANG Haibin,ZHOU Yunyao,LU Yongqing,XIANG Ya.Application and Discussion on Wavelet Threshold Method in Seismic Data Recorded by JCZ Series Ultra-Wideband Seismographs[J].Journal of Geodesy and Geodynamics,2021,41(3):323-330. |
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| Authors: | WANG Haibin ZHOU Yunyao LU Yongqing XIANG Ya |
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| Institution: | (Key Laboratory of Earthquake Geodesy,Institute of Seismology,CEA,Wuhan 430071,China) |
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| Abstract: | To effectively denoise the seismic data collected by the JCZ series ultra-wideband seismograph,we discuss the actual effect of wavelet threshold method in different seismic data.Firstly,this paper introduces the basic theory of wavelet method and the standard of denoising.We analyze the effect of different wavelet base selection,different decomposition,reconstruction scale and different threshold selection and processing methods on the final denoising effect of wavelet threshold method.Through the control variable method,and selecting recorded data from the seismic station in Wuhan University,we explore how to obtain better denoising effect.In order to compare the effect of the same method in two cases of small earthquakes and medium-strong earthquakes,we use the selected wavelet base and geometric scale to denoise the seismic data.In actual seismic denoising,the threshold selected based on sample number estimation has certain limitations,and the same threshold has different results in denoising in different magnitudes.Finally,the wavelet threshold is used to denoise the seismic data collected by the JCZ series ultra-wideband seismographs and we find that it is also helpful for the identification and judgment of the P wave first motion. |
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| Keywords: | JCZ-1 ultra-wideband seismograph wavelet analysis wavelet threshold denoising control variable method |
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