雲林與南彰化地區在1999年的集集地震中廣泛遭受包含結構損壞、土壤液化事件。考量到災害地點容易受地層條件影響，因此有必要研究這些地區在地層與地震災害的交互關係，然而在傳統地層調查作法上，常使用的標準貫入試驗(SPT)或是圓錐貫入試驗(CPT)卻往往需要耗費大量時間、經費、且受限於試驗設備操作空間等限制，因此本研究使用攜帶方便的非破壞性檢測儀器微振儀量取微振動訊號，並以其為基礎建立一種快速且簡便探討地層特性以及評估地震引發土壤液化潛勢的方法。
本研究分為兩部分，第一部分於現地使用微振動量測得到H/V振幅頻譜圖，接著利用?=??/4?轉換式將(H/V)振幅頻譜圖轉(?⁄?)?—深度圖比較與土壤強度參數SPT-?值之間的關係，並以此為基礎推估地層剪力波速，再以放大係數(?⁄?)?值建立評估土壤液化潛(Liquefaction Potential Jian, ??? )，同時利用雲林、南彰化研究區域具有的鑽探資料的孔位進行比對，經NCEER法(2001)液化評估方法，計算出液化潛勢指數(LPI)，並迴歸出關係式為???=2.634???，以此定義低中高液化潛勢時之關係；第二部分，於研究區域上將微振動分析而得到之各點位卓越週期，經由內插法繪製全區卓越週期分布圖，並與921集集地震發生建築物災損之地點進行疊圖分析，探討卓越週期與災損建築物基本振動週期之關係。
第一部分研究結果發現，經回歸微振動液化評估法得到之???與LPI之關 聯性可以定義液化潛勢分界，低度液化潛勢時???≤2，中度液化潛勢時2 <???≤6，高度液化潛勢時???≥ 6；第二部分結果發現，921集集地震中毀損之建築物基本振動週期大多與地盤卓越週期分布相近，因此本研究繪製之卓 II 越週期分布圖或許可提供未來本區域之建築物設計規劃作參考。

Yunlin and Southern Changhua areas were widely affected by structural damage and soil liquefaction events during the 1999 Chichi earthquake. Considering that disaster locations are often influenced by local geological conditions, this study employs portable and non-intrusive approach with microtremor, to collect microtremor signals. Based on these signals, a rapid and simple method is established to investigate soil characteristics, shear wave velocity (Vs) and soil liquefaction potential.
The first part uses H/V amplitude spectral ratios of the site obtained by microtremor. These H/V amplitude spectra are then converted into (H/V)f - depth profiles using the function fg = Vs/4H. Then, we compared the relationship between these profiles and SPT-N values. Based on this relationship, the shear wave velocity can be estimated. Additionally, the amplification factor (H/V)f is used to establish the Liquefaction Potential Jian (LPJ), and then calculates the liquefaction potential index (LPI). Finally, regression relational function to assessment the relationship between the LPI.
In the second part, the predominant period at each measurement point, obtained through microtremor analysis within the study area, is applied to the study area by GIS interpolation. This map is then overlaid with the locations of building damage from the 921 Chi-Chi earthquake to analyze the relationship between the predominant period and the natura period of the damaged buildings.
Finally, the relationship between the LPJ and the LP) can be used to classify liquefaction potential. when LPJ of ≤2 indicates low liquefaction potential, 2< LPJ ≤6 indicates moderate liquefaction potential, and LPJ ≥6 indicates high liquefaction potential.

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