完整的場址效應包括線性及非線性行為下的不同特性，多數情況下場址效應接近線性的放大特性，但在軟弱地盤、高震度情況下，高頻地震波的非線性放大特性就會變得顯著。本研究擬分析陸地及海底的非線性場址放大效應，在陸地上，利用氣象局設置的地表—井下地震站進行分析，近年來該地震網已收集到數個大規模的強震資料，並有研究分析其淺層剪力波速度構造與場址參數，這些資訊可以用來分析井下傳遞到地表的震波放大特性之變化；在海底，因強震和鑽井資料遠比陸地稀少，故以往少有海底強震特性的研究，而近年來氣象局在宜蘭外海建置海纜強震儀，距離琉球隱沒帶很近，可望有數筆高震度資料可進行分析，或許能對海底的場址效應有初步的了解。 ;Seismic site effect should consist of linear and nonlinear behaviors. Seismic waves are usually amplified linearly in most cases, but high frequency seismic waves could express nonlinear amplifications under high intensity especially at soft soils. This study will analyze nonlinear site amplification for both inland and offshore sites. For the inland sites, we would like to use the Surface-Downhole stations for the analysis because several large magnitude earthquakes have been recorded by the network and the shallow S-wave velocity profiles as well as the site parameters are available from recent studies. We are able to analyze the variation of seismic amplifications from downhole to surface using the data and information. For the offshore sites, there was no strong motion studies due to lock of data. The CWB has installed instruments on offshore Ilan. The locations are close to the Ryukyu subduction zone so several high intensity ground motion records may be available for our analysis to understand site effect at ocean bottom.
