本研究針對臺北盆地內各個氣象局強震測站，使用實測地震紀錄並透過單站頻譜法來探討臺北盆地之場址效應，並利用場址效應因子計算Nakamura損傷指數Kg值，與各測站實際之液化潛能相比較，希望能藉此建立出損傷指數Kg值與液化潛能之相關性。首先，利用全國強震測站場址工程地質資料庫(EGDT)之臺北盆地各測站鑽探資料，以雙曲線函數評估法(HBF法)、美國國家地震工程研究中心評估法(NCEER法)、日本建築學會評估法(AIJ法)及新日本道路協會評估法(NJRA法)進行液化潛能評估，並探討各方法之差異性；其中，以HBF法、NJRA法及NCEER法等三種方法結果較為相近，AIJ法所得液化潛能則較其他三種方法明顯為低。接著，由1999年至2019年間之地震事件中選取臺北盆地之有效地震記錄，先以傅立葉轉換檢視地震動之頻率特性，再以單站頻譜比法探討臺北盆地之場址特性。結果顯示，由單站頻譜比所判釋之地盤顯著頻率，在臺北盆地內大致小於2Hz，盆地邊緣則會大於2Hz，顯示出顯著頻率能展現場址岩盤深度之差異；此外，顯著頻率與平均剪力波速呈現相當之正相關性，代表顯著頻率會受到近地表土層勁度所影響。進一步由顯著頻率與放大係數計算損傷指數Kg值，並與液化潛能指數(LPI)進行相關性探討，兩者雖略呈正相關，但相關性偏低，約略可將Kg值為40視為高液化潛能之門檻。綜合以上，可知利用強震資料進行單站頻譜法分析可合理評估場址地盤特性，據以計算之損傷指數Kg值可概略反映出液化潛能之趨勢，將可做為液化防治之初步參考。

In this study, the site effect of Taipei Basin was studied by using the strong motion data and the HVSR method. The site effect factors were used to calculate the Nakamura vulnerability index (Kg), which was then correlated to the liquefaction potential of the site. Firstly, the LPI was evaluated through HBF method, NCEER method, AIJ method and NJRA method based on borehole data. Among them, the results of the HBF, NJRA and NCEER methods are relatively similar, while the AIJ method yields somewhat lower LPI than the other three methods. Then, earthquake records from 1999 to 2019 were used to obtain HVSR, and the results showed that the predominant frequency is approximately less than 2Hz in the basin and greater than 2Hz at the margin of basin, indicating that the predominant frequency reveals the difference in the bedrock depth of the site and is dependent on near-surface velocity structure of the ground. Moreover, Kg values were calculated using predominant frequencies and amplification factors identified from HVSR, and the result showed that Kg is only slightly positive correlated to LPI. A Kg value of 40 could be roughly regarded as the threshold of high liquefaction potential. In conclusion, HVSR analysis using strong motion data can provide a reasonable assessment of the site effect, and Kg can approximately reflect the trend of liquefaction potential, which can be used as a preliminary reference for liquefaction mitigation.

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