世界上對於泥貫入體的研究指出，泥貫入體發育於海域地層並在接近陸地時停止活動，再經地殼抬升及地表侵蝕作用出露於陸域。然而，對於陸域泥貫入體現今是否有再活動之跡象並不清楚。台灣西南部及其外海主要由厚的泥岩組成，又因超額孔隙水壓之作用，使此區不論在海域或陸域皆存在許多泥貫入體。此外，因台灣西南部位於歐亞板塊和菲律賓海板塊交界之擠壓環境，孕育出大量的逆衝斷層，亦即台灣西南部現今之地殼活動可能部分是由泥貫入體再活動加上斷層錯動所造成。本研究利用2000到2010年間128個GPS測站和310個水準點資料，來分析台灣西南部現今地表變形，並探討各主要斷層（小岡山斷層、龍船斷層、旗山斷層）現今之活動特性及其與陸域泥貫入體間的相互關係。相對於穩定大陸邊緣之速度場分析結果顯示，垂直速度場之空間分佈和地形起伏有高度相關。抬升主要發生在丘陵地區，特別是在小岡山斷層和旗山斷層之間；平原及沿海地區則以沈陷為主。小岡山斷層以西主要為沈陷，而以東之垂直速度則逐漸增加至約18 mm/yr的最大抬升量，再逐漸向東下降，繼續朝東跨過旗山斷層後則幾乎無抬升或為沈陷型態。此外，水平速度場的分析結果指出，旗山斷層以東區域約為66 mm/yr、N270°，跨越此斷層向西則逐漸遞減至約15 mm/yr、N259°，此結果顯示在小岡山斷層和旗山斷層之間存在一明顯之速度梯度。本研究接著採用二維斷層模型來推求各主要斷層之運動學行為，同時並用張裂錯位模型（opening-mode dislocation）之膨脹速率來模擬泥貫入體之變形型態。其模擬結果得知，小岡山和旗山斷層之北段滑移速率分別為17.4 mm/yr和2.5 mm/yr，而張裂錯位模型之膨脹速率約為3.9 mm/yr。另外，小岡山與旗山斷層之斷層南段滑移速率分別為16.9 mm/yr和16.2 mm/yr。由近乎一致的長期和短期垂直速度場、泥岩的弱岩性與此區並無災害型歷史地震之發生暗示此區位於泥岩中之活斷層可能以潛移的方式活動著並導致此區具有較高的擠壓速度。在模擬結果中之微量膨脹速率則暗示此區陸域泥貫入體可能有再活動之跡象，而台灣西南部之斷層也可能受控於泥貫入體之幾何形貌沿著泥貫入體之樞紐處發育。

The growth of offshore mud diapir has been proposed to stop near the inshore area. However, whether the inland mud diapir re-grows in the present due to the plate convergence? In addition, the westward propagation of the active reverse faults results from the NW convergence between the Philippine Sea plate and the Eurasian plate in SW Taiwan. Therefore in order for understanding the contemporary interaction between the development of the inland mud diapir and the movement of active reverse faults (the Hsiaokangshan fault, Lungchuan fault, and Chishan fault), 128 campaign-mode GPS observations and 310 Leveling measurements between 2002 and 2010 are used to comprehend the characteristics of present-day crustal deformation in SW Taiwan. For the vertical velocity field, the uplift rate west of the Hsiaokangshan fault is almost zero and the rate east of the fault increases to the maximum uplift of ~18 mm/yr. Then the vertical velocity decreases eastward to almost no deformation. The horizontal velocity field from 2002 to 2010 shows that velocities east of the Chishan fault are ~66 mm/yr, 270°. Then the velocities gradually decrease westward to ~15 mm/yr, N259°. An obvious horizontal velocity gradient is presented between the Chishan fault and the Hsiaokangshan fault. The 2D fault model results in the northern region of SW Taiwan indicate that the fault slip rates are mainly distributed on the Hsiaokangshan fault and the Chishan fault with 17.4 mm/yr and 2.5 mm/yr, respectively. In addition, the rate of the opening-mode dislocation is ~3.9 mm/yr in this area. For the southern region of SW Taiwan, the slip rates of the Hsiaokangshan fault and Chishan fault are 16.2 mm/yr and 16.9 mm/yr, respectively. The consistency between the long-term and short-term vertical velocities in SW Taiwan, weak rock strength of mud stone and no historical destructive earthquakes imply that the active faults at the mud stone area in SW Taiwan may act as creeping fault and result in high contraction rate. The minor opening rate in SW Taiwan may imply the reactivation of the inland mud diapir. In addition, the fault geometries in SW Taiwan may be controlled by the geometry of the mud diapirs, growing along the hinges of mud diapirs.

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