被动源体波信息提取技术及其质量监控

Passive seismic body wave extraction technology and it’s quality control

基于互相关的被动源地震干涉测量是一种潜在的、经济有效的地质与地球物理研究技术.然而,被动源地震记录常以面波能量为主,从被动源地震记录中提取体波仍然是一项具有挑战性的任务.首先,本文系统阐述和比较了互相关和反褶积以及互相干三种干涉方法的差异,并指出在进行体波成像时使用互相干方法效果更好;其次,为了有效增强体波信号,本文提出了一套被动源体波信息提取技术来识别和压制被动源地震记录中的面波以及其他噪声事件,随后又应用了相应的质量监控措施来评价该技术的处理效果;最后,将上述技术与质量监控措施应用于内蒙古官屯堡乡的某一被动源地震数据集,质量监控结果表明,被动源体波信息提取技术能有效地压制面波,消除噪声并增强较弱的体波能量.

Passive seismic interferometry based on cross-correlation is a potential, economical and effective geological and geophysical research technique. However, surface wave dominate the passive seismic records, so it is still a challenging task to extract body-wave from passive seismic records. Firstly, the differences of cross-correlation, deconvolution and cross-coherence are systematically described and compared, and it is pointed out that the cross-coherence method is better when carrying out body-wave imaging. Secondly, in order to enhance the body-wave effectively, a set of technology is proposed to identify and suppress surface waves and other noise events in passive seismic records, and the corresponding quality control measures are applied to evaluate the processing effect of this technology. Finally, the above techniques and quality control measures were applied to a passive seismic dataset in Guan tunbao Township, Inner Mongolia. The quality control results show that the passive seismic body wave extraction technology can effectively suppress surface waves, eliminate noise and enhance the weak body-wave energy.