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Title:: Application and Study of S-Transform Time-Frequency Domain Filtering Method in Active Seismic Source Data Processing

作者:: 张帅¹; 杨润海¹; 王彬¹; 孙守才²; 庞卫东¹; 姜金钟¹; 高尔根³; (1.云南省地震局,云南昆明 650224; 2.防灾科技学院地球科学学院,河北三河 065201; 3.安徽建筑大学土木工程学院,安徽合肥 230000)

Author(s):: ZHANG Shuai¹; YANG Runhai¹; WANG Bin¹; SUN Shoucai²; PANG Weidong¹; JIANG Jinzhong¹; GAO Ergen³; (1. Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)(2. School of Earth Sciences,Institute of Disaster Precention,Sanhe 065201,Hebei,China)(3.School of Civil Engineering, Anhui Jianzhu University,Hefei 230000,Anhui,China)

Keywords:: S-transform; active seismic source; time-frequency domain filtering; signal to noise ratio

摘要:: 主动源探测中源检距较大的接收台站,由于信号能量较弱及各种干扰的存在,有效信号湮灭于干扰信号之中,导致信噪比降低。利用S变换时频域滤波方法分别对一维、二维加噪数据进行数值模拟计算,发现该方法可对随机信号进行有效识别,输出信号与原始信号互相关程度提高。再将此方法与频率滤波方法应用于宾川主动源高兴台数据处理中,结果表明:S变换时频域滤波方法能够在主动源资料处理中对噪声形成有效压制,提高地震信号信噪比,且效果优于频率域滤波方法。

Abstract:: In the active seismic source detection,the receiving station with a large source ranging has a weak signal energy and various interferences,and the effective signal is extinguished in the interference signal,resulting in a decrease in the signal-to-noise ratio of the signal. The S-transform time-frequency domain filtering method is used to simulate the 1-D and 2-D noise-added data respectively. It is found that this method can effectively identify random signals and improve the correlation between the output signal and the original signal. Then,the S-transform time-frequency filtering method and frequency filtering method are applied to filter the data of Gaoxing station in Binchuan active source. The results show that the S-transform time-frequency domain filtering method can effectively suppress noise in active source data processing and improve the signal-to-noise ratio of seismic signals,and the effect is better than that of frequency domain filtering method.