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Dipping-interface Mapping Using Mode-separated Rayleigh Waves

机译：使用模式分离的瑞利波的浸渍界面映射

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Multichannel analysis of surface waves (MASW) method is a non-invasive geophysical technique that uses the dispersive characteristic of Rayleigh waves to estimate a vertical shear (S)-wave velocity profile. A pseudo-2D S-wave velocity section is constructed by aligning 1D S-wave velocity profiles at the midpoint of each receiver spread that are contoured using a spatial interpolation scheme. The horizontal resolution of the section is therefore most influenced by the receiver spread length and the source interval. Based on the assumption that a dipping-layer model can be regarded as stepped flat layers, high-resolution linear Radon transform (LRT) has been proposed to image Rayleigh-wave dispersive energy and separate modes of Rayleigh waves from a multichannel record. With the mode-separation technique, therefore, a dispersion curve that possesses satisfactory accuracy can be calculated using a pair of consecutive traces within a mode-separated shot gather. In this study, using synthetic models containing a dipping layer with a slope of 5, 10, 15, 20, or 30 degrees and a real-world example, we assess the ability of using high-resolution LRT to image and separate fundamental-mode Rayleigh waves from raw surface-wave data and accuracy of dispersion curves generated by a pair of consecutive traces within a mode-separated shot gather. Results of synthetic and real-world examples demonstrate that a dipping interface with a slope smaller than 15 degrees can be successfully mapped by separated fundamental waves using high-resolution LRT. Keywords Rayleigh waves - pseudo-2D S-wave velocity section - high-resolution linear Radon transform - mode separation - dipping layer
机译：表面波多通道分析（MASW）方法是一种非侵入性的地球物理技术，它利用瑞利波的色散特性来估计垂直剪切（S）-波速剖面。伪2D S波速度剖面是通过将每个1D S波速度剖面在每个接收器扩展的中点对齐而构造的，这些剖面使用空间插值方案进行了轮廓处理。因此，该部分的水平分辨率受接收机扩展长度和源间隔的影响最大。基于可以将浸润层模型视为阶梯状平坦层的假设，提出了高分辨率线性Radon变换（LRT）来成像瑞利波分散能量和来自多通道记录的瑞利波分离模式。因此，利用模式分离技术，可以使用模式分离的击球道内的一对连续轨迹来计算具有令人满意的精度的离散曲线。在这项研究中，使用包含倾斜度为5、10、15、20或30度的浸渍层的合成模型和一个真实示例，我们评估了使用高分辨率LRT成像和分离基本模式的能力来自原始表面波数据的瑞利波以及由模式分隔的镜头集内的一对连续轨迹生成的色散曲线的准确性。合成和实际示例的结果表明，使用高分辨率LRT可以通过分离的基波成功绘制出斜率小于15度的倾斜界面。关键词瑞利波-伪2D S波速度剖面-高分辨率线性Radon变换-模式分离-浸润层

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