| Summary: | 碩士 === 國立成功大學 === 地球科學系碩博士班 === 92 === 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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