由於歐亞板塊與菲律賓板塊相互間的聚合擠壓，使得台灣發育於馬尼拉隱沒系統與琉球隱沒系統的交界帶，為一典型弧陸碰撞的例子。為了了解台灣造山帶現今地殼變形的運動模式，於本研究中，我們分析全台灣813個GPS移動站與12個GPS連續站的觀測資料。分析結果指出，相對於中國大陸邊緣測站S01R之水平速度場於台灣地區呈扇形分布。其速度量由台灣東南部約88 mm/yr向西北逐漸遞減至台灣西北部的近乎無變形。此外，本研究也藉由速度場的分析發現三條主要呈北北東-南南西走向之速度不連續面，它們分別沿著東部縱谷斷層，造山前緣與變形前緣在分佈。台灣東部地區呈逆衝且具有左移分量之東部縱谷斷層，其運動形式主要受到沿縱谷走向變化之弧陸碰撞強度所影響。縱谷斷層中段（即池上斷層）則具有約25 mm/yr之最大縮短量。2003年Mw 6.8之成功地震也是沿著此斷層發育。藉由213個GPS測站所獲得之成功地震水平同震位移指出，跨越池上斷層具有垂直斷層走向之擠壓，而上盤則具有垂直斷層走向與平行斷層走向之伸張環境。成功地震產生較大的破裂面積與較小的應力降顯示池上斷層之斷層強度較弱。此外，同震模型也指出池上斷層可被分為北側的潛移區段與南側的鎖定區段。鎖定區段部份產生規模6.8地震的重複週期約為50年。另一方面，增積楔西翼之山脈前緣和變形前緣的型態皆為S形，該型態主要是受控於既有構造的幾何型貌。就台灣西南部而言，其速度場指出南北走向之潮州斷層主要以純逆衝型態在活動，東北-西南走向之旗山斷層則為具有右移分量之逆衝斷層，而N140°之鳳山斷層則為左移斷層。其中，鳳山斷層的錯動會導致速度場由近乎朝西的方向旋轉至朝西南西平行基盤高地南緣的方向。台灣西南部近乎東西方向擠壓與南北方向伸張的應力場在上部地函是以南北向之地幔流呈現；在地殼則是以旗山斷層與鳳山斷層所形成的共軛斷層呈現。最後，由於增積楔上之逆衝斷層發育造成台灣南部中央山脈至恆春半島同碰撞伸張的形成。

Taiwan, seated at the junction of the Manila and the Ryukyu subduction systems, is a classical case of the ongoing arc-continent collision due to the convergence between the Eurasian and the Philippine Sea plates. In order to understand the kinematics of present-day interseismic crustal deformation of Taiwan, we analyzed GPS observations from 813 campaign-mode GPS stations and 12 continuous-recorded stations. Horizontal velocities relative to the Chinese continental margin station, S01R, reveal a fan-shaped distribution. Their magnitudes gradually decreases northwestward from ~88 mm/yr in SE Taiwan to nearly no deformation in NW Taiwan. According to analysis of velocities, three major NNE-SSW-striking velocity discontinuities were identified along the Longitudinal Valley Fault, the mountain front, and the deformation front, respectively. The kinematics of the sinistral reverse Longitudinal Valley Fault in eastern Taiwan is dominated by the intensity variation of the arc-continent collision. The central segment (the Chihshang fault) of the Longitudinal Valley Fault (23°N - 23.7°N) undergoes a maximum shortening rate of ~25 mm/yr. The 2003 Mw 6.8 Chengkung, Taiwan, earthquake occurred along this fault. Horizontal coseismic displacements of the 2003 Chengkung earthquake, determined with 213 GPS stations, represent the fault-normal shortening across the fault trace and the fault-parallel and the fault-normal lengthening on the hanging wall. This earthquake generates a larger rupture area and a lower stress-drop, suggesting lower than average fault friction. In addition, this model also indicates that the Chihshang fault is divided into a creeping segment in the north and the locked segment in the south. An average recurrence interval of 50 years for a magnitude 6.8 earthquake was estimated for the locked segment of the Chihshang fault. On the other hand, both mountain front and deformation front reveal S-shaped pattern in the western flank of the accretionary wedge, mainly controlled by the configuration of the inherited structures. For the SW Taiwan, velocity field indicates the N-S-trending Chaochou fault acting as nearly pure reverse faulting, the NE-SW-striking Chishan fault (CHNF) as reverse faulting with right-lateral motion, and the Fengshan transfer fault zone (FTFZ) as left-lateral shearing, intersecting aforementioned fault. The movement of FTFZ enhances velocities rotating from nearly westward direction to WSW direction, sub-parallel to the southern edge of the Peikang basement high. A nearly E-W contraction and N-S extension escaping stress regime is accommodated by N-S-trending ductile flow within the upper mantle and by brittle conjugated-type fracture, formed by the CHNF and the FTFZ, within the crust. The mechanism of syn-orogenic extension located from the southern Central Range to the Hengchun peninsula is caused by the growth of the thrust belt at the accretionary prism.

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