摘 要
本研究係以內政部國土測繪中心所提供e-GPS測站2005-2007年共33站連續觀測資料，解算位於大陸邊緣的台灣海峽區域之地表速度場變化。藉此我們探討臺灣海峽區域地表運動方式，其為伸張或擠壓，臺灣島是否遠離中國大陸抑或靠近，速度方向為何。分析結果顯示：相對於澎湖白沙站，臺灣西部由北到南速度場依序為1.44~6.85mm/yr、3.85~10.83mm/yr、13.46~71.04mm/yr：速度方位角由北到南依序為304°~317°〈逆時針方向移動〉轉為速度方位角4.03°~63.74°〈順時針方向移動〉、277°~304°〈逆時針方向移動〉、270°~280°之間。澎湖群島及金門與馬祖列島地區速度方向介於123.92°~270.23°，速度介於0.81~3.01mm/yr。以澎湖島為界：臺灣海峽西側為擠壓，應變量為 0.0017μstrain/yr ~ 0.010μstrain/yr；其東側亦為擠壓，應變量為 0.013μstrain/yr ~ 0.210μstrain/yr。除了澎湖群島外圍有小部份伸張型應力系統，臺灣海峽為擠壓應變型態。以澎湖群島為界，台灣海峽西側的應變量皆小於臺灣海峽東側的應變量。臺灣本島、澎湖群島、金門與馬祖列島根據速度場及應變量分析結果，得知臺灣本島接近澎湖島之速度遠比澎湖島接近中國大陸之速度更快。

Abstract
The observations from 33 continuous GPS stations provided by the National Land Surveying and Mapping Center in Taiwan form 2005 and 2007 are used to resolve the surface velocity field of the Chinese continental margin in the Taiwan Strait . We discuss the mode of surface deformation, to see whether the Taiwan island is moving away from the Chinese continent or is approaching to it. We estimate the velocities and the direction of these continuous GPS stations. Compare with the Penghu station (S01R), the velocity fields from north to south of the western Taiwan are 1.44~6.85mm/yr, 3.85~10.83mm/yr and 13.46~71.04mm/yr, respectively. The azimuth ranges from 304°~317° to 4.03°~63.74° (counterclockwise ) in the north, the middle part is 277°~304° (counterclockwise ) and the south is 270°~280° (counterclockwise ). The azimuths and velocities of the Penghu, Kinmen and Matsu islands are in the ranges of 123.92°~312.51° and 0.81~3.01mm/yr. Take Penghu Island as the boundary, the strain field of the west side of the Taiwan Strait is shortening and the rate is 0.0017 ~ 0.010μstrain/yr. The strain field of the east side is also shortening and the rate is 0.013 ~ 0.210μstrain/yr. The strain field of the Taiwan Strait is shortening. The periphery of the Penghu Islands with a small portion of extension strain field is the exception. The strain rate of the west side of the Taiwan Strait is less than the east side. According to our results, the velocity of the Taiwan island approaches the Penghu Island is faster than that of the Penghu Island approaches the Chinese continent.

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