當地震波穿過地球介質，會受到介質的異質性、異相性與裂隙等影響而改變震波特性，再由地表地震儀器接收，而觀測到的數據可反應地下介質的非均勻性，本研究目標為尋找鄰近場址的裂隙在震波頻譜圖上造成的差異。
本研究區域為士文水庫預定壩址，其周圍有三個強震測站，在八八風災後 SW-1 測站產生明顯的地表裂隙作為參考對象，共有253 筆本區收集到的地震資料使用於本次分析。研究方法是利用單站法與雙站法繪製地震波頻譜比圖，將不同測站的頻譜分析作比對並確立地下裂隙在震波變異的效應。
本研究發現在頻率13-20Hz之間因裂隙存在影響，頻譜比值有明顯下降趨勢，推測原因為震波通過裂隙後產生能量消散的情形，因此頻譜比值亦下降，此趨勢並無顯著方向性影響，且震源離裂隙之距離也無顯著影響。

The purpose of this study is to find a feasible method to detect the existence of near site subsurface cracks via spectral analysis of seismic wave. The seismograph adjacent to a surface crack is used as target testing at planned Shin-Wen Reservoir site. Both the SSR and HVSR methods are used. The cracks effect is reflected on the reducing of Fourier amplitude ratio at frequency 13-20Hz.

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