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Reliability Evaluation on Weak Signal Extraction for Airgun Source Surveys

查看全文 作　　者：Wu [1]Anxu;Ye [2]Beng 高影响力作者 机构地区：[1]Beijing Earthquake Agency,Beijing 100080,China;[2]Western Yunnan Earthquake Prediction Study Area,CEA,Dali 671000,Yunnan,China高影响力机构 出　　处：《Earthquake Research in China》索引2018年第32卷第2期,共15页高影响力期刊 基　　金：sponsored by the Spark Program of Earthquake Science and Technology,CEA(XH16003);the National Natural Science Foundation(NNSF) of China under Grant No.41474087 摘　　要：Based on the data synthesis simulation and the actual processing of the airgun seismic source signal,three quantitative indicators of signal-to-noise ratio,waveform correlation coefficient and phase offset,are superimposed. We systematically evaluate the functions of the following three stack methods including linearity,phase weighting and S-transform in the extraction of weak signals under strong background noise and quantitatively estimate the reliability of the stack results. Through the comprehensive discussion of the above three methods of stack results,the preliminary comparative analysis believes that the linear stack signal-to-noise ratio is low,but the waveform distortion is minimal; the phase-weighted superimposed signal-to-noise ratio is high and the phase offset is small,but the results of the waveform quality and linear stack are larger than the deviation; the S-transform stack has a relatively higher signal-to-noise ratio and a small loss of waveform amplitude,but there is a certain phase shift phenomenon. It is therefore suggested that linear stack technology should be used when the requirements of both waveform quality and time precision are high. However,the selection of the stack method when the airgun source excitation is limited should be emphasized. If high fidelity is required, the S-transform stack method should be selected; if the required time is high,accuracy can be selected by phase-weighted stack method to achieve reasonable extraction of weak signals. 关 键 词：Airgun SOURCE WEAK signal EXTRACTION Linear STACK Phase-weighted STACK S-TRANSFORM STACK
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