| 三种常用叠加方法提取气枪信号的效果分析 |
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| 引用本文： | 游秀珍,李军,邵平荣,赵文波,李水龙.三种常用叠加方法提取气枪信号的效果分析[J].西北地震学报,2021,43(3):512-522. |
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| 作者姓名： | 游秀珍 李军 邵平荣 赵文波 李水龙 |
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| 作者单位： | 福建省地震局, 福建 福州 350003 |
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| 基金项目： | 国家自然科学基金“气枪震源在地壳介质变化监测中的精度及影响因素分析”（41774068） |
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| 摘 要： | 基于安砂水库气枪震源实验资料,采用线性叠加、频谱白化叠加和相位加权叠加三种常用叠加技术进行处理,从信噪比、波形相关性和震相走时差等方面,分析评估三种叠加方法的实际应用效果。结果表明:(1)相位加权叠加方法提高信噪比的能力最强,但是与线性叠加一样,两者都无法有效地消除强干扰,而频谱白化则可以削弱强干扰的影响,有利于信号准确识别;对低信噪比波形,频谱白化提高信噪比的效果优于线性叠加,反之亦然。(2)以线性叠加结果为参考,相位加权的相关性高,走时差基本为零,但波形中较小幅值的信号可能会被压制,影响小幅值波形信号的判别;频谱白化在台站信噪比高时,波形相关性较差,且存在一定走时差,可能出现震相到时前的波形被放大,使震相初至变得模糊,影响到时拾取精度。
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| 关 键 词： | 大容量气枪震源 线性叠加 频谱白化 相位加权 |
| 收稿时间： | 2019/12/17 0:00:00 |
Effects of Air-gun Signal Extraction Using Three Common Stacking Methods |
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| YOU Xiuzhen,LI Jun,SHAO Pingrong,ZHAO Wenbo,LI Shuilong.Effects of Air-gun Signal Extraction Using Three Common Stacking Methods[J].Northwestern Seismological Journal,2021,43(3):512-522. |
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| Authors: | YOU Xiuzhen LI Jun SHAO Pingrong ZHAO Wenbo LI Shuilong |
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| Institution: | Fujian Earthquake Agency, Fuzhou 350003, Fuzhou, China |
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| Abstract: | In this paper, three common stacking methods, i.e., linear stacking, spectrum whitening stacking, and phase-weighted stacking, were used to process the experimental data of air-gun source in Ansha reservoir. The practical application effects of the three methods were analyzed and evaluated from the aspects of signal-to-noise ratio, waveform correlation, and seismic phase travel-time difference. The results showed that: (1) The phase-weighted stacking method has the strongest ability to improve the signal-to-noise ratio, but both of it and the linear stacking method can not effectively eliminate strong interference. The spectrum whitening method can weaken the influence of strong interference, resulting in accurate recognition of signal. For the waveform with low signal-to-noise ratio, the spectrum whitening method is better than linear superposition in improving signal-to-noise ratio, and vice versa. (2) With the reference of linear stacking results, the correlation of phase-weighted method is high, and the travel-time difference is basically zero, but the signal with small amplitude in the waveform may be suppressed, thus affecting the discrimination of waveform signal with small amplitude value; when the signal-to-noise ratio of the station is high, the waveform correlation is poor, and there is a certain travel time difference. Then the waveform before the arrival of seismic phase may be amplified, which makes the first arrival of seismic phase fuzzy, and affects the picking accuracy. |
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| Keywords: | large volume air-gun source linear stacking spectrum whitening phase-weighted |
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