本研究蒐集美濃地區2000-2003年以來之GPS以及精密水準測量觀測資料。研究區內總共佈設42個監測點，其中20個點位為GPS點；16個點位為精密水準點；6個點位實施GPS兼精密水準測量。GPS利用瑞士伯恩大學天文研究所（Astronomical Institute of the University of Berne；簡稱AIUB）發展之BERNESE GPS V4.2與美國加州噴射推進實驗室（Jet Propulsion Laboratory；簡稱JPL）董大南博士開發的QOCA Version 1.21兩套科學計算軟體進行分析處理，而將結果分為平均速度場、主軸應變率與剪應變率三項進行討論。而精密水準測量資料則依一等水準測量作業規範（內政部，2001）進行處理。
　　精密水準測量成果顯示位於美濃水庫預定壩址集水區之東北－西南走向的廣林斷層，斷層右側年平均抬升量大於左側約2 mm/yr。GPS研究成果顯示美濃地區速度場相對澎湖白沙介於51-63 mm/yr，方向介於265-283度，呈東西方向。同時透過速度場剖面分析得知東北－西南走向的旗山斷層右側之速度量大於左側速度量，呈現右移運動；而廣林斷層也有右移的趨勢。主軸應變率分析發現潮州斷層至旗山斷層之最小主軸應變率（壓縮），量值由0.88-3.66 μstrain/yr，方向從144度轉向104度呈現逆時鐘旋轉的變化。廣林斷層與六龜斷層間的地帶有0.88-3.16 μstrain/yr ，方向由128度轉為61度的壓縮現象。旗山斷層、廣林斷層與月光山斷層間地帶呈現3.91-3.16 μstrain/yr，方向由178度轉為194度的壓縮情形。再者透過最大剪應變率結果分析各網形應力狀況，本研究得到以下結論：1. 美濃地區之旗山斷層北段與延伸至屏東平原之旗山斷層南段移動方向一致，以右移為主。就斷層長度而言，旗山斷層（40 km）最大可發生規模6.9的地震。2. 廣林斷層（右移）與六龜斷層（左移）之間有脫逸（extrusion）現象發生。3. 旗山斷層（右移）與廣林斷層（右移）之間的地帶存在拉張構造（pull-apart basin）。

　　We collected GPS and precise leveling data in Meinong area between 2000 and 2003. We established 20 GPS stations and 16 leveling benchmarks in the area to investigate fault activities. GPS data were processed with BERNESE GPS software V4.2 developed at the Astronomical Institute of the University of Berne and QOCA Version 1.21 developed by Dr. D. Dong at Jet Propulsion Laboratory. We discuss the velocity field, principal strain rate field and the shear strain rate field using the processed GPS data. On the other hand, we processed the precise leveling data according to the first-order level surveying standard (Ministry of Interior, 2001).
　　The results of precise leveling data show that the uplift rate in the hanging wall of Kuanlin fault is higher than that in the footwall by about 2mm/yr. The result of GPS data show that the velocity field relative to Paisha, Penghu in Meinong area is 51-63 mm/yr, - (W-E). Besides, the horizontal velocity in the hanging wall of Chishan fault is larger than that in the footwall. The principal shortening rate is 0.88-3.66 μstrain/yr and oriented - from Chaochou fault to Chishan fault. Between the Kuanlin fault and Liukui fault the principal shortening rate is 0.88-3.16 μstrain/yr and oriented - . The principal shortening rate is 3.91-3.16 μstrain/yr and oriented - between Chishan fault Kuanlin fault and Yueikuanshan Fault.
　　Finally, we reach three conclusions with combining the maximum engineering shear rates from 7 subnets：first, the motion of north part of Chishan fault in Meinon area and the southen part of this fault in Pingtung plain indicate right-lateral. Furthermore, it may cause MW 6.9 earthquake according to the fault length of 40 km. Second, extrusion tectonics may occur between Kuanlin fault (dextral) and Liukui fault (sinistral). Third, it exists pull-apart basin between Chishan fault (dextral) and Kuanlin fault (dextral).

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