Joint application of active and passive surface wave in 3D imaging of loess covered area
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摘要: 黄土盖层对地震波、电磁波等有很强的衰减作用,限制了地震反射波法、电磁波法等多种物探方法在黄土覆盖区的应用。针对黄土盖层厚度大、分层细的特点,采用主动源与被动源面波法联合勘探,使两种面波方法优势互补,达到准确探测黄土覆盖区地质分层的目的。研究区位于渭河盆地凤翔县郊,为典型的黄土覆盖区,黄土覆盖层厚度为80~120 m。通过对研究区主动源与被动源面波实测资料的处理,得到的二维横波速度剖面上的主要地层分层位置与实际钻孔测试结果基本一致,同时得到了研究区的三维地层结构。联合成像结果表明采用被动源与主动源面波联合勘探进行黄土覆盖区地层结构分层是可行且有效的,为黄土覆盖区地质填图提供了技术支持和有益思路。Abstract: Due to the strong attenuation effect of loess cover on seismic and electromagnetic waves, the successful application of seismic reflection wave method and electromagnetic wave method in loess covered area is limited.In view of the characteristics of large thickness and fine stratification of loess cover, the active source and passive source surface wave methods are combined in this paper, so that the advantages of the two surface wave methods are complementary and the geological stratification of loess covered area can be accurately detected.The study area is located in the suburb of Fengxiang County,Weihe Basin.It is a typical loess covered area, and the thickness of loess cover is 80~120 m.By processing the measured data of active and passive surface waves in the study area, the positions of the main strata on the 2D shear wave velocity profile are basically consistent with the actual borehole test results, and the 3D stratum structure in the study area is also obtained.The results of joint imaging show that it is feasible and effective to use passive and active surface wave joint exploration for stratification of loess covered area, which provides technical support and beneficial idea for geological mapping of loess covered area.
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