In professional activities aimed at seismic site classification, geophysical methods based on measurements of surface waves are often used to measure the shear-wave velocity (Vs), with the MASW survey being one of the most common techniques employed for this purpose. An MASW survey is characterized by an in-field configuration that requires a relatively simple setup; however, several uncertainties that arise are related to the survey execution process. Thus, surface irregularities and/or obstacles on the ground surface in conjunction with possible human-related errors can result in alterations to the MASW survey execution. Therefore, it is necessary to possess a clear understanding of the variables that can potentially produce alterations in Vs profiles. The purpose of this study was to evaluate, based on a field measurement campaign, the effect of the repeatability of the sledgehammer trajectory prior to striking the plate and the effects of variations in the collinearity of the geophone arrays on the Vs profile in consideration of various forced alterations commonly encountered in practice. The repeatability of the active source trajectory plays a significant role in the quality and reliability of Vs measurements. Likewise, altering the collinearity of the geophone array leads to reductions in the amplitude at low frequencies, thereby hindering the interpretation of the test. The recorded effects become more relevant depending on the local conditions and whether the surveyed terrain exhibits possible heterogeneity.

中文翻译：

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MASW测量中大锤轨迹的变化和地震检波器阵列的共线性对剪切波速度剖面的影响

在针对地震现场分类的专业活动中，基于表面波测量的地球物理方法通常用于测量剪切波速度（Vs），而MASW测量是用于此目的的最常用技术之一。MASW测量的特点是需要相对简单设置的现场配置。但是，出现的一些不确定性与调查的执行过程有关。因此，地面上的表面不规则和/或障碍物以及可能与人类有关的错误可能会导致对MASW调查执行的更改。因此，有必要对可能导致Vs轮廓发生变化的变量有清楚的了解。这项研究的目的是基于实地测量运动来评估 考虑到实践中通常遇到的各种强迫变化，敲击板块之前大锤轨迹的可重复性的影响以及地震检波器阵列的共线性的变化对Vs轮廓的影响。有源源轨迹的可重复性在Vs测量的质量和可靠性中起着重要作用。同样，改变地震检波器阵列的共线性会导致低频幅度的减小，从而阻碍了测试的解释。根据当地条件以及所调查的地形是否表现出可能的异质性，所记录的影响变得更加相关。