信義區為近年來快速蓬勃發展的政治金融區，2003年11月開幕的國際101金融大樓使得信義區更成為全世界的矚目的新景點。但是從地震震災事件發現，許多從花蓮、宜蘭來的大地震，此區的災害常比遠在百公里外的震央附近嚴重許多。檢視信義區內的兩個強震站也發現，靠近101大樓的信義國小所收到的地震記錄比靠山邊的吳興國小多很多，記錄下的震度也大些，但兩強震站的地震儀所設定的觸發位準（Trigger Level）是一樣的。 本研究使用兩強震站所收到的共同地震記錄與信義區內極密集的微地動量測方法，針對兩強震站的場址放大效應進行深入的研究與探討，再與前人文獻所得的詳細之信義區內松山層厚度和速度作比較，探討二測站地動特性的差異與造成此差異可能的原因。 結果發現微地動所獲得的場址效應分佈圖與松山層厚度分佈圖的形貌有良好的吻合度；且信義國小下方確實有一較深的松山層厚度在控制其低頻（約1?2Hz）放大之行為，不論任何地震能量傳遞至信義國小，水平向的能量皆會被放大，並在1Hz左右有明顯的放大效應。 本研究亦證實了利用微地動方法量測沖積層的場址效應是可靠的地球物理方法，而且藉由弱地動資料評估場址效應進而應用在地震危害分析將是一個重要的課題。 HsinYi area is rapidly developing political and economic zone in these days, the opening of Taipei Financial Center has made this neighborhood a well-known new spot internationally. But from many earthquake damage records, this area is much more serious than epicenter that are far from hundred kilometers as Hualien and Ilan. Scrutiny the two stations of strong motion network in HsinYi（TAP022 and TAP089）we discover that TAP022（close Taipei Financial Center） receives more earthquake datas than TAP089, its recording intensity is also more large, but the trigger level of the two strong motion stations are the same. We use the common earthquake datas of the two stations and very intensive microtremor measurement in HsinYi area to investigate and discuss the site effect of the two stations especially. Then compare our site effect map with and SunShan thickness and velocity maps for discussing the ground motion characters of the two sites and their possible reasons. We fine that using microtremor measurement can get a well fit in site effect and SunShan thickness maps；and we make sure that SunShan thickness controls the site TAP022’s low frequency（1?2Hz）site effect, no matter what the earthquake’s energy pass this area, the horizontal component will enlarge especially about 1Hz. This research also verifies that using microtremor measurement is a good geophysical method for estimating the site effect of alluvium. By the way we can apply those site effect estimation for seismic hazard analysis.
