Monitoring Surface Deformation in Taipei Basin and Sanchiao Fault Using Persistent Scatterers InSAR Method

• Main Authors: Wang, Yi-Fang, 王怡方
• Other Authors: Ng, Sin-Mei
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/86953811637370236540

碩士 === 中國文化大學 === 地學研究所地質組 === 101 === 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.