ABSTRACT In this paper, using synthetic and real data, we tested the capability of surface wave‐based methods for detecting subsoil lateral variations across an inclined slope. Simplified soil structures at different inclination angles were considered following an advanced 2D finite‐element modelling approach. Different values of inclination angle (10°–170° at 10° steps), spatial sampling rate and synthetic array length were used in different subsoil models to see the effects. It was found that, as low inclination angles (smaller than 40° with respect to the horizontal axis) are not detectable using the surface wave methods based on offset‐phase angle (X–ϕ), such methods are not able to correctly recognize the location of possible lateral variations at such inclination angles. On the other hand, for intermediate inclination angles (i.e. between 40° and 140°), the X–ϕ approach was successfully used to determine the exact location of the lateral variations for a wide range of frequencies, thereby opening new perspectives for the application of surface waves for detecting laterally inclined layers.

中文翻译：

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表面波检测横向变化的应用：埋入斜面

摘要在本文中，我们使用合成数据和真实数据，测试了基于表面波的方法检测倾斜坡度上的底土横向变化的能力。遵循先进的二维有限元建模方法，考虑了不同倾斜角度的简化土壤结构。在不同的底土模型中使用不同的倾角值（10°–170°，步长 10°）、空间采样率和合成阵列长度来观察效果。结果发现，由于使用基于偏移相位角 (X-ϕ) 的表面波方法无法检测到低倾角（相对于水平轴小于 40°），因此此类方法无法正确识别在这种倾斜角度下可能的横向变化的位置。另一方面，对于中间倾角（即