近地表三维复杂介质中瑞雷波传播特性研究

项目名称： 近地表三维复杂介质中瑞雷波传播特性研究

项目编号： No.41274123

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 熊章强

作者单位： 中南大学

项目金额： 80万元

中文摘要： 构造形态在三维空间中变化的立体性和介质性质在各方向上变化的复杂性是实际地下介质的两个固有属性。本项目拟通过理论分析和数值模拟作为主要研究方法：研究三维各向同性和各向异性介质中非均匀体对瑞雷波的散射特征；研究瑞雷波高模式的形成机理、耦合方式及影响瑞雷波高模式的地层结构因素；研究随机介质中瑞雷波的传播特性。并通过开展野外实验研究，对观测数据的瑞雷波散射特性、高模式特征以及基于随机介质模型的瑞雷波特征等进行分析，验证所设计的各种三维复杂介质模型刻画瑞雷波传播特性的有效性，以达到较全面地认识瑞雷波在实际地下介质中波场传播规律的目的。本项研究结果不仅对提高近地表复杂地质结构条件下瑞雷波的探测精度和实现三维面波勘探有重要的理论意义和应用价值，而且对大尺度地质结构的面波研究也具有参考价值。

中文关键词： 面波；三维复杂介质；高阶模式；模式分离；随机介质

英文摘要： 3D spatial changes of structure and complexity of variation in the physical medium along different directions are two intrinsic properties of the underground media. Upon the theoretical analysis and numerical modeling, study are carried out for the scattering characteristics of the heterogeneous body for the Rayleigh wave in the 3D isotropic and anisotropic medium. Meanwhile, the formation mechanism and coupling mode of the high mode Rayleigh wave, the stratal configuration factors affecting the high mode Rayleigh wave, and the propagation characteristics of the Rayleigh wave in the random medium are examined. In addition, by means of the field experiment, the scattering characteristics and the characteristics of the high mode Rayleigh wave in the observation data, and the characteristics of the Rayleigh wave for the random medium models, are analyzed to validate the efficiency of the propagation characteristics of the Rayleigh wave portrayed by various 3D complex medium models. The propagation of surface wave in the actual underground medium will be completely understood. The results are of important theoretical and practical significance in improving the precision of the surface wave exploration under conditions of near-surface complex geologic configuration, carrying out 3D surface wave exploration, and stud

英文关键词： Surface wave；3D complex medium；high mode；mode separation；random medium