場址效應及其影響的地震危害度，在近年來受到廣泛重視。場址效應受到岩性、地下構造等因素的影響，而這兩者都會直接影響到地震波波速，只要能知道波速的變化就能知道特定地區的場址特性。使用微地動來進行觀測，因其設置便利、資料處理容易等特性，非常適合場址效應的研究，包括計算單站的頻譜特性，以及使用陣列計算區域地下的波速。我們利用台灣陣列(Formosa Array)所收錄，於2021年6~8月的連續紀錄作為微地動的資料來源，比較不同研究得到的速度構造，藉此探討北臺灣地區的場址特性。
我們使用Nakamura的H/V頻譜比法計算陣列中136個點位每日的H/V頻譜比結果並進行比較，此方法為地震波在頻率域中，水平對垂直振幅之比值。結果主要可以分成3大類：第1類為平地，具有較低的共振主頻f0(<2Hz)；第2類為丘陵及山地，具有較高的共振主頻f0(>2Hz)；第3類為台地，其放大倍率A0普遍較低(≤2)
平地部分的低共振主頻主要受到沉積層的影響，使低速層比較明顯；台地部分的低放大倍率則受到表層礫石層的影響，使層間波速對比並無明顯減少。該陣列同時跨過火成岩、沉積岩、以及變質岩地區，然而在本研究中，這些岩層之間的場址特性，至少無法從H/V及速度構造來做區別。
在放大倍率部分，去掉台地類型(A0≤2)結果的部分，主要分布於2~7之間，且集中於2.5~4.5之之間，顯示在北臺灣地區的表層地層相較於基盤層，其速度之對比不會太大。
另外我們利用H/V來估算臺北盆地以及宜蘭平原的沉積層厚度，分別約為603.71m及1199.61m，大致接近實際厚度。而我們也比較了外在因素對於H/V的影響，自然事件如地震等對於H/V的影響並不大，人為事件則能明顯改變。最後我們也試著利用H/V來探討非地層方面的特性(例如火山活動，人為噪訊等)，也初步發現其可行性。

Site effect and its related seismic hazard has received widespread attention in recent years. Site effect is affected by factors such as lithology and underground structure, both of them have direct impact on seismic wave velocity, so knowing the change of wave velocity can help us know the site characteristics in specific region. Using microtremor for the observation, is very suitable for the study of site effect, including spectral characteristics of single station and underground wave velocity using seismic array. We obtained continuous seismic data from Formosa Array, time ranges from June to August 2021, combined with velocity structure from different studies, to discuss the site characteristics in Northern Taiwan. We used H/V spectral ratio method, proposed by Nakamura, which was calculated from microtremor wave in frequency domain. We calculated daily H/V spectral ratio for 136 stations and did the comparison. The result can be divided into three types depending on their f_0 and A_0, and they show high correlation on specific geological characteristics like sediment and gravels layers. The results also suggest the lack of velocity contrast between surface layer and bedrock layer in northern Taiwan. Additionally, we estimated the sediment layer thickness in Taipei Basin and Ilan Plain using the result, and are roughly close to the actual thickness. We also compared the effect on H/V with external factor, and tried to use H/V to discuss about non-stratigraphic characteristics.

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