本研究利用二維物理模型模擬不同深度之表層並選擇物理特性適合的材質作為模型製作的材料，以傾角為三度之直角三角形及另一具不等深度之階梯形壓克力板作為表層的材質，並將壓克力板接合在鋁板上，且以鋁板模擬半空間基盤；將震源置於壓克力板邊緣，並以分析表面波(雷利波)的頻散曲線，期望找出衰減及速度和厚度變化是否有關係。
由研究結果顯示，表面波波長與表層厚度比及速度有其相關性，尤其群速變化較相速有較佳集中性，因此我們利用群速與表面波波長及表層厚度比作為回歸及推估表層厚度之參考依據。

1. The energy decreases linearly with increase distance between source and reciver.
2.The group velocity to the ratio of wavelength to overburden depth can be decried by the falling empirical formula Vgroup=a(λ/h)-1+b. The velocities change sharply on the ratio of wave- length to depth in the range 3-5.

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