Although this study has already explicitly proposed criteria, procedures and algorithms for field testing and dispersion analysis, the standardization of MASW is yet to be well established. Several future studies remained to be carried out.
1. In the present study, the signal quality of raw data and uncertainty of the dispersion analysis is only qualitatively evaluated. A more precise quantitative analysis can be further conducted.
2. The optimal offset range selection is still a manual procedure that may lead to different results by different users. An automatic procedure will be helpful to improve efficiency and objectivity in the dispersion analysis.
3. The effective offset range is inherently restricted by the near and far field effect.
The offset range may not always be long enough to separate different modes when multiple modes dominate. How to deal with multiple modes or effective mode in the inversion is another subject for further investigation.
4. It is well known that the surface wave is more sensitive to velocity profile at shallow depth. The advantage of wavelength-controlled dispersion analysis should be further investigated. For example, future studied may be carried out to see whether a thin layer at deeper depth can be detected.
5. This study assumes that the medium is horizontally layered. Investigations on the effects of lateral heterogeneity are also suggested for future studies.
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