當地震發生時，現地土層所反應的相關機制，尚有許多不確定性的問題存在，故本研究之目的，在於運用系統識別方法，探求土壤動態參數。系統識別之參數估計方法乃藉由量測記錄資料作為輸入輸出值，套用特定的準則，建立一個能夠代表土層系統的模型結構，此數學模型之參數，具有某種相關的物理意義，例如阻尼、剛性等。本研究採用羅東與菁寮兩測站之震測式井下陣列記錄資料，進行系統識別與場址效應之分析，發現識別之效果，與模型階數、地震強度、雜訊訊號比等因素有關，而在場址效應方面，同一地點不同地震事件之下，土層顯著頻率的變化，為土壤在強震作用下，進入非線性行為之跡象。

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