基于MASW和SPAC的主-被动源面波联合探测方法及其应用  

The Joint Detection Method of Active-Passive Surface WaveBased on MASW and SPAC and Its Application

作　　者：罗登贵 金聪 LUO Denggui;JIN Cong(Hubei Key Laboratory of Earthquake Early Warning,,Wuhan 430071,China;Hubei Earthquake Agency,,Wuhan 430071,China;Wuhan Institute of Earthquake Engineering Co Ltd,Wuhan 430071,China)

机构地区：[1]地震预警湖北省重点实验室,武汉市430071 [2]湖北省地震局,武汉市430071 [3]武汉地震工程研究院有限公司,武汉市430071

出　　处：《大地测量与地球动力学》2024年第8期827-832,共6页Journal of Geodesy and Geodynamics

摘　　要：以贵州独山变电站内地层为研究对象,将主动源面波多道分析法(multichannel analysis of surface waves,MASW)和被动源面波空间自相关法(spatial auto correlation,SPAC)频散能量叠加,得到一条复合频散曲线。该曲线频带更宽,既能保证表层的分辨能力,避免形成较大的勘探盲区,又可以有效提高反演深度,获得更加精细化的横波速度模型。结合钻探资料对比标定,可赋予该模型地质意义。研究结果表明,采用MASW和SPAC相结合的分析方法,有利于从表层到深层对地层进行精细成像,了解地层的岩性结构特征。与钻探相比,该方法成本低、效率高,可为复杂城区不良地质体的探测提供重要参考依据。In this paper,the interior layer of Dushan substation in Guizhou province is taken as the research object.We generate a composite dispersion curve by superimposing the dispersion energy of multichannel analysis of active surface waves(MASW)and spatial auto correlation(SPAC)of passive surface waves.The curve has a wider frequency band,which can not only ensure the resolution of the surface layer and avoid the formation of a large exploration blind area,but also effectively improve the inversion depth and obtain a more refined shear wave velocity model.The model can be given geological significance in combination with the drilling data.The results show that the combination of MASW and SPAC is beneficial to the fine imaging of the strata from the surface to the deep layer,and to understand the lithological structure characteristics of the strata.Compared with drilling,this method has low field construction cost and high efficiency,and it can provide an important reference for the detection of unfavorable geological bodies in complex urban areas.

关 键 词：主动源面波 被动源面波 MASW SPAC 频散曲线 

分 类 号：P315[天文地球—地震学]