室內試驗量測岩土動態性質雖已發展得相當完善，然室內試驗在取樣、運送及試體準備等過程有擾動岩土材料之虞，無法完全還原的現地真實狀況，而現地試驗有不擾動材料之優點，為此，本文將於土壤地質的成大工址及岩石地質的新北兩處工址，透過現地鑽孔震測法中較常見之「下孔式震測法」獲得震波數據，並嘗試以四種不同的方法，分別為時間域兩種不同定義的上升時間法；頻率域的頻譜比例法與頻譜斜率法，反求現地地層材料之阻尼特性，最後比較各方法之成果差異。
比較兩種不同上升時間法計算結果，可發現Gladwin與Stacey（1974）方法所計算的結果較Blair與Spathis（1982）穩定，且獲得之阻尼比較小。頻率域方法中，雖頻譜比例法與頻譜斜率法結果相近，但頻譜斜率法可能因高頻衰減不明顯，再加上窗函數的長短也會影響結果，在分析過程不穩定且耗時，因此頻譜斜率法運用於下孔式震測法相較不合適。綜合比較四種方法結果顯示，以兩種不同的上升時間法獲得之阻尼比與室內試驗結果較為接近，而頻率域的兩種方法計算阻尼比結果均大於時間域的方法。

The laboratory test may disturb the rock or soil materials in the process of sampling, transportation and sample preparation. In-situ seismic test has the advantage of avoiding the disturbance of geotechnical materials, which can obtain more accurate dynamic parameters of soil or rock. The downhole seismic test has been shown to give reasonable results for in-situ measurements of shear wave velocity, and this paper extends this work to include measurements of damping. Three different methods is used to determine the material damping ratio with depth, which are spectral ratio method, spectral slope method, and two definitions of rise time method.
The results show that damping ratio obtained by rise time method defined by Gladwin and Stacey (1974) are smaller than those defined by Blair and Spathis (1982). The damping ratio results obtain by time domain method are smaller than spectral ratio method or spectral slope method and more closer to the results of laboratory test. Compare the damping values determined from spectral ratio method with the values determined from spectral slope method, it can be found that the spectral ratio method can obtain more reasonable data points. Therefore, we suggest that spectral ratio method is a better method in frequency domain.

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