表面波譜法（Spectral Analysis of Surface Wave method, SASW）是將雷利波藉由頻譜分析求得土層剖面剪力波速與剪力模數資料。由於此法進行試驗時僅需將受波器置於測體表面，且對測體之影響屬微小應變（<0.001%），故此試驗屬非破壞檢測範疇，可簡便、快速求取土壤動態參數。
本研究旨在增進表面波譜法的準確性。原始訊號利用非穩態訊號處理技術中的經驗模態分解（The Empirical Mode Decomposition , EMD），將分解後的訊號套至傳統表面波譜法分析步驟中反算評估現地剪力波速。
本研究以黃俊豪（2003）於中部地區之實驗數據，將分析結果與PS logging、黃俊豪（2003）及小波轉換所得之結果做一綜合比較。結果顯示使用EMD有較佳分析結果，也證實非穩態分析方法在表面波試驗上的可行性。

Spectral analysis of surface wave method has been developed to determining the shear wave velocity and shear modulus of soil deposit. All SASW field tests are performed at small strain level（γ＜0.001％）with instrumentation placed on the one exposed surface. Thus, SASW itself is a type of nondestructive testing. Using SASW to get soil dynamic parameters is more convenient and much easier.
The purpose of this study is to improve the accuracy of SASW. Original signal is re-analyzed by EMD of non-steady state signal processing. The decomposing signal substituted into the process of conventional SASW can get the wave velocity in situ.
In this study, the data measured from central Taiwan by Huang（2003）is re-analyzed. After comparing with PS logging result, the result obtained from using EMD is better than those of Huang’s result and using wavelet transform.

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