摘要
为研究噪音对主动源信号走时变化提取精度的影响,采用对比数值实验的方法。按照常规流程,首先用反褶积去除震源激发时间的不确定性干扰,压缩子波以得到更加尖锐的震相,由于发现反褶积会降低信号的信噪比,于是提出了台差法来代替反褶积矫正气枪激发的不确定性,再结合干涉法提取走时变化,并定量对比了两者的走时变化提取精度,最后尝试用台差法提取主动源走时的日变化。结果表明,台差法可以有效矫正震源激发时刻的影响,且不降低信噪比,从而也能获得较高走时变化提取的精度。
We adapt numerical tests to study the influence of noises on the precision of travel time drift of active source signals In traditional ways,deconvolution is used to eliminate the uncertainty of the excitation time of active source However,this process will significantly lower the signal-noise ratio and thus lead the decline of precision We put forward a new method named pair difference to replace deconvolution for the sake of eliminating the influence of the active source The results show that pair difference can effectively eliminate the impact of active source and will not affect the signal-noise ratio,thus improving the precision of extracting travel time drifts
作者
黄亦磊
运乃丹
周仕勇
HUANG Yilei;YUN Naidan;ZHOU Shiyong(Institute of Theoretical and Applied Geophysics,Peking University,Beijing 100871,China)
出处
《地震研究》
CSCD
北大核心
2017年第4期595-604,共10页
Journal of Seismological Research
基金
云南省陈颙院士工作站(2014IC007)
中国地震研究专项(201508009)
中国国家自然科学基金(41474033)联合资助
关键词
主动源
走时变化
走时台差法
信噪比
active source
travel time drift
pair difference method
signal-noise ratio
