台灣地區水平速度場與模型之研究

臺灣因地處歐亞板塊及菲律賓海板塊交界，各區域會因為板塊間非線性運動往不同的方向旋轉、位移。臺灣使用的坐標系統為TWD97建立於ITRF94框架下，不能表達臺灣複雜的地殼變動，需加上速度場與變形模型來改正因地殼運動造成之坐標偏移。本研究利用2005年至2015年間臺灣地區連續運行參考站GPS觀測資料計算水平速度場，以内插、曲面擬合、局部加權回歸散點平滑等方法建立臺灣地區水平速度與變形模型。臺灣地區參考站坐標解算之水平精度為2mm-3mm、高程精度為6mm-10mm，速度場之年度平均標準差在N軸為0.38cm/yr，E軸為0.52cm/yr。水平速度場模型方面以内插法中的線性及三次内插法建立之模型有最好的精度。

關鍵字

連續運行參考站；板塊運動；速度場；變形模型

並列摘要

Taiwan is located along the bounding of the Eurasian and the Philippine plate. Therefore, the crust shifts and rotates in different directions due to the changing stress field. The currently Taiwan coordinate system (TWD97) is built in ITRF94, and the velocity and deformation model are needed to correct the distortion which caused by the crustal motion. This study used 11 years (2005-2015) of Taiwan Continuously Operating Reference Station's (CORS) GPS data to investigate the horizontal velocity field and established the horizontal velocity and deformation model by curve fitting, interpolation and Locally Weighted Scatterplot Smoothing method. The horizontal coordinate accuracy of the CORS is about 2mm-3mm, the vertical accuracy is about 6mm-10mm, and the average standard deviation of velocity field is 3.81mm/yr in N axis, 5.18mm/yr in E axis. As for velocity model, linear and cubic spline interpolations have better model accuracy.

並列關鍵字

CORS ； plate motion ； velocity field ； deformation model

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