台灣位於歐亞板塊與菲律賓海板塊的交界帶，兩板塊間活躍的聚合運動導致衛星基本控制點的年位移量可高達4-5公分。台灣現有的水平速度場模型是以斷層反演軟體DEFNODE建立，此軟體藉由塊體旋轉運動以及斷層滑移速率估計速度量。然而，該模型內採用的物理參數其假設與現實狀況不完全一致，將會影響模型的精度。因此，本研究使用最小二乘配置法搭配472個全球衛星定位系統測站水平速度場資料發展水平速度場模型，並探討了斷層滑移速率對於模型精度的影響。研究結果顯示，本研究建立的速度場模型精度較現有的模型精度提升了3%，說明了本研究發展之模型能夠更準確地提供衛星基本控制點的年位移量。但是，本研究發展的速度場模型對於斷層滑移速率大於20mm/year的地區有較差的推估精度，說明該地區為目前本模型估計水平速度量時的限制。

Taiwan is located at the boundary between the Eurasian plate and Philippine Sea plate, where active plate motion leads to significant annual displacements of geodetic control points up to 4-5 cm. The existing horizontal velocity model is established by DEFNODE which contain the blocks rotation and the fault slip rate to estimate horizontal velocity in Taiwan. However, the assumptions of the physical parameters didn’t conform to reality situations in DEFNODE. Therefore, we used Global Positioning System (GPS) velocity observations collected at 472 points from 1993 to 2005 and the Least-squares Collocation (LSC) technique to create a horizontal velocity model, and discuss the influence of fault slip rate. The results show that the accuracy of velocity model improves 3% by comparing to the existing model. The results also indicate that the developed model is capable of providing more accurate estimates of annual displacements of geodetic control points than the existing model. However, this velocity model has inferior accuracy when points locate in fault slip rate greater than 20mm/year regions which is the restriction.

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