利用永久散射體差分干涉法監測 台北盆地與山腳斷層之地表變形研究

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Title:	利用永久散射體差分干涉法監測台北盆地與山腳斷層之地表變形研究 Monitoring Surface Deformation in Taipei Basin and Sanchiao Fault Using Persistent Scatterers InSAR Method
Authors:	王怡方 Wang, Yi-Fang
Contributors:	地學研究所地質組
Keywords:	永久散射體差分干涉法台北盆地山腳斷層地表變形 PSInSAR Taipei Basin Sanchiao Fault surface deformation
Date:	2013-07
Issue Date:	2013-09-30 15:35:28 (UTC+8)
Abstract:	根據經濟部地質調查所於2010年公布之資訊，全台灣共有33條活動斷層；其中山腳活動正斷層位於台北都會區，此地區為台灣主要的經濟、貿易、政治、人口密集的都市。由於近年來盆地內部大型工程建設增加，斷層及人為活動所導致的地表變形都將造成台北都會區嚴重的災害。本研究利用永久散射體差分干涉法（Persistent Scatterers Interferometry Synthetic Aperture Radar , PSInSAR），並應用歐洲太空總署之Envisat衛星所拍攝的SAR影像探討2003年11月至2008年6月台北盆地與山腳斷層之間地表變形之情況。本研究將PSInSAR的結果比對內政部衛星測量中心台灣北部水準資料及量化其結果之可信度，輔以地下水位的歷年變化資料，探討台北盆地與山腳斷層之間地表變形情況與可能發生的機制。由研究結果顯示，主要下陷區域較靠近山腳斷層，下陷量每年最大可達5 mm，由西向東漸緩。此外，本研究利用研究結果重新繪製山腳斷層可能的位置。綜合結果比對顯示，盆地內部主要下陷的地區，係屬於大台北都會區的郊區，人為活動及建設影響程度較低，下陷原因認為除人為因素外，可能受山腳斷層活動而導致盆地下陷。本研究監測的時間跨距較短，然而山腳斷層上一次活動距今約11000年，因此無法代表台北盆地與山腳斷層之間地表變形的關係。希望未來能長時間監測此區地表變形狀況，以供未來工程建設與地質災害評估參考。 According to the 2010 report from the Central Geological Survey MOEA, there were 33 active faults in Taiwan. One of the active faults is Sanchiao Fault which is located at Taipei metropolitan area. The Taipei metropolitan area is a densely populated, economic, trade and politics center. In recent years, increasing numbers of major engineering projects have been undergoing within the Taipei basin. Surface deformation due to faulting and human activities poses potential threats in the Taipei metropolitan area. In this research, we use a relatively new geodesy technique, Persistent Scatterers Interferometry Synthetic Aperture Radar (PSInSAR); and, we utilize SAR images from Envisat, European Space Agency（ESA）during the period from November 2003 to June 2008 to monitor Taipei Basin and Sanchiao Fault. In order to quantify and verify the reliability of our results, PSInSAR results are compared to leveling results from the Satellite Survey Center, Department of Land Administration, MOI. We also analyze groundwater level changes over the years (1950-2010) and explore the possible surface deformation mechanisms. Based on the result of this study, the main subsidence area is located closer to Sanchiao Fault area. Its maximum subsidence rate can reach 5 mm per year and it gradually slows down from west side toward east side. In addition, probable location of Sanchiao Fault is redefined. In overall, the main area of subsidence is located at Taipei suburban area. Besides the human activities, the activity of Sanchiao Fault may contribute to the subsidence. The time span of this study is too short to monitor the surface deformation between Taipei Basin and Sanchiao Fault. In the near future, we hope we can continue monitor this area and provide more reference for engineering and geological hazard assessments.
Appears in Collections:	[Department of Geography & Graduate Institute of Earth Science / Geography ] thesis

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